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# Conflicts:
#	docs/html/search/all_f.js
#	docs/html/vk__mem__alloc_8h.html
#	docs/html/vk__mem__alloc_8h_source.html
#	src/vk_mem_alloc.h
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Adam Sawicki 2018-09-21 16:48:42 +02:00
commit 3951aa5bc3
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@ -141,7 +141,23 @@ Ring buffer</h2>
<div class="image">
<img src="../gfx/Linear_allocator_6_ring_buffer_lost.png" alt="Ring buffer with lost allocations"/>
</div>
<p>Ring buffer is available only in pools with one memory block - <a class="el" href="struct_vma_pool_create_info.html#ae41142f2834fcdc82baa4883c187b75c" title="Maximum number of blocks that can be allocated in this pool. Optional. ">VmaPoolCreateInfo::maxBlockCount</a> must be 1. Otherwise behavior is undefined. </p>
<p>Ring buffer is available only in pools with one memory block - <a class="el" href="struct_vma_pool_create_info.html#ae41142f2834fcdc82baa4883c187b75c" title="Maximum number of blocks that can be allocated in this pool. Optional. ">VmaPoolCreateInfo::maxBlockCount</a> must be 1. Otherwise behavior is undefined.</p>
<h1><a class="anchor" id="buddy_algorithm"></a>
Buddy allocation algorithm</h1>
<p>There is another allocation algorithm that can be used with custom pools, called "buddy". Its internal data structure is based on a tree of blocks, each having size that is a power of two and a half of its parent's size. When you want to allocate memory of certain size, a free node in the tree is located. If it's too large, it is recursively split into two halves (called "buddies"). However, if requested allocation size is not a power of two, the size of a tree node is aligned up to the nearest power of two and the remaining space is wasted. When two buddy nodes become free, they are merged back into one larger node.</p>
<div class="image">
<img src="../gfx/Buddy_allocator.png" alt="Buddy allocator"/>
</div>
<p>The advantage of buddy allocation algorithm over default algorithm is faster allocation and deallocation, as well as smaller external fragmentation. The disadvantage is more wasted space (internal fragmentation).</p>
<p>For more information, please read <a href="https://en.wikipedia.org/wiki/Buddy_memory_allocation">"Buddy memory allocation" on Wikipedia</a> or other sources that describe this concept in general.</p>
<p>To use buddy allocation algorithm with a custom pool, add flag <a class="el" href="vk__mem__alloc_8h.html#a9a7c45f9c863695d98c83fa5ac940fe7a97a0dc38e5161b780594d998d313d35e" title="Enables alternative, buddy allocation algorithm in this pool. ">VMA_POOL_CREATE_BUDDY_ALGORITHM_BIT</a> to <a class="el" href="struct_vma_pool_create_info.html#a8405139f63d078340ae74513a59f5446" title="Use combination of VmaPoolCreateFlagBits. ">VmaPoolCreateInfo::flags</a> while creating <a class="el" href="struct_vma_pool.html" title="Represents custom memory pool. ">VmaPool</a> object.</p>
<p>Several limitations apply to pools that use buddy algorithm:</p>
<ul>
<li>It is recommended to use <a class="el" href="struct_vma_pool_create_info.html#aa4265160536cdb9be821b7686c16c676" title="Size of a single VkDeviceMemory block to be allocated as part of this pool, in bytes. Optional. ">VmaPoolCreateInfo::blockSize</a> that is a power of two. Otherwise, only largest power of two smaller than the size is used for allocations. The remaining space always stays unused.</li>
<li><a class="el" href="debugging_memory_usage.html#debugging_memory_usage_margins">Margins</a> and <a class="el" href="debugging_memory_usage.html#debugging_memory_usage_corruption_detection">corruption detection</a> don't work in such pools.</li>
<li><a class="el" href="lost_allocations.html">Lost allocations</a> don't work in such pools. You can use them, but they never become lost. Support may be added in the future.</li>
<li><a class="el" href="defragmentation.html">Defragmentation</a> doesn't work with allocations made from such pool. </li>
</ul>
</div></div><!-- contents -->
<!-- start footer part -->
<hr class="footer"/><address class="footer"><small>

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@ -89,7 +89,7 @@ Margins</h1>
<p>If your bug goes away after enabling margins, it means it may be caused by memory being overwritten outside of allocation boundaries. It is not 100% certain though. Change in application behavior may also be caused by different order and distribution of allocations across memory blocks after margins are applied.</p>
<p>The margin is applied also before first and after last allocation in a block. It may occur only once between two adjacent allocations.</p>
<p>Margins work with all types of memory.</p>
<p>Margin is applied only to allocations made out of memory blocks and not to dedicated allocations, which have their own memory block of specific size. It is thus not applied to allocations made using <a class="el" href="vk__mem__alloc_8h.html#ad9889c10c798b040d59c92f257cae597a3fc311d855c2ff53f1090ef5c722b38f" title="Set this flag if the allocation should have its own memory block. ">VMA_ALLOCATION_CREATE_DEDICATED_MEMORY_BIT</a> flag or those automatically decided to put into dedicated allocations, e.g. due to its large size or recommended by VK_KHR_dedicated_allocation extension.</p>
<p>Margin is applied only to allocations made out of memory blocks and not to dedicated allocations, which have their own memory block of specific size. It is thus not applied to allocations made using <a class="el" href="vk__mem__alloc_8h.html#ad9889c10c798b040d59c92f257cae597a3fc311d855c2ff53f1090ef5c722b38f" title="Set this flag if the allocation should have its own memory block. ">VMA_ALLOCATION_CREATE_DEDICATED_MEMORY_BIT</a> flag or those automatically decided to put into dedicated allocations, e.g. due to its large size or recommended by VK_KHR_dedicated_allocation extension. Margins are also not active in custom pools created with <a class="el" href="vk__mem__alloc_8h.html#a9a7c45f9c863695d98c83fa5ac940fe7a97a0dc38e5161b780594d998d313d35e" title="Enables alternative, buddy allocation algorithm in this pool. ">VMA_POOL_CREATE_BUDDY_ALGORITHM_BIT</a> flag.</p>
<p>Margins appear in <a class="el" href="statistics.html#statistics_json_dump">JSON dump</a> as part of free space.</p>
<p>Note that enabling margins increases memory usage and fragmentation.</p>
<h1><a class="anchor" id="debugging_memory_usage_corruption_detection"></a>

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@ -99,6 +99,27 @@ $(function() {
<li>VMA_ALLOCATION_CREATE_NEVER_ALLOCATE_BIT
: <a class="el" href="vk__mem__alloc_8h.html#ad9889c10c798b040d59c92f257cae597a89759603401014eb325eb22a3839f2ff">vk_mem_alloc.h</a>
</li>
<li>VMA_ALLOCATION_CREATE_STRATEGY_BEST_FIT_BIT
: <a class="el" href="vk__mem__alloc_8h.html#ad9889c10c798b040d59c92f257cae597a839826775c62319466441f86496f036d">vk_mem_alloc.h</a>
</li>
<li>VMA_ALLOCATION_CREATE_STRATEGY_FIRST_FIT_BIT
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<li>VMA_ALLOCATION_CREATE_STRATEGY_MASK
: <a class="el" href="vk__mem__alloc_8h.html#ad9889c10c798b040d59c92f257cae597a8e16845d81ae3d27c47106d4770d5c7e">vk_mem_alloc.h</a>
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<li>VMA_ALLOCATION_CREATE_STRATEGY_MIN_FRAGMENTATION_BIT
: <a class="el" href="vk__mem__alloc_8h.html#ad9889c10c798b040d59c92f257cae597a621b704103eb3360230c860acf36e706">vk_mem_alloc.h</a>
</li>
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: <a class="el" href="vk__mem__alloc_8h.html#ad9889c10c798b040d59c92f257cae597ad242a04f802e25fef0b880afe8bb0a62">vk_mem_alloc.h</a>
</li>
<li>VMA_ALLOCATION_CREATE_UPPER_ADDRESS_BIT
: <a class="el" href="vk__mem__alloc_8h.html#ad9889c10c798b040d59c92f257cae597a42ba3a2d2c7117953210b7c3ef8da0df">vk_mem_alloc.h</a>
</li>
@ -135,6 +156,12 @@ $(function() {
<li>VMA_MEMORY_USAGE_UNKNOWN
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<li>VMA_POOL_CREATE_ALGORITHM_MASK
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</li>
<li>VMA_POOL_CREATE_BUDDY_ALGORITHM_BIT
: <a class="el" href="vk__mem__alloc_8h.html#a9a7c45f9c863695d98c83fa5ac940fe7a97a0dc38e5161b780594d998d313d35e">vk_mem_alloc.h</a>
</li>
<li>VMA_POOL_CREATE_FLAG_BITS_MAX_ENUM
: <a class="el" href="vk__mem__alloc_8h.html#a9a7c45f9c863695d98c83fa5ac940fe7a1c7312bea9ea246846b9054fd6bd6aec">vk_mem_alloc.h</a>
</li>

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@ -61,7 +61,9 @@ $(function() {
</div>
<div class="contents">
&#160;<ul>
&#160;
<h3><a id="index_v"></a>- v -</h3><ul>
<li>VMA_ALLOCATION_CREATE_CAN_BECOME_LOST_BIT
: <a class="el" href="vk__mem__alloc_8h.html#ad9889c10c798b040d59c92f257cae597a5f436af6c8fe8540573a6d22627a6fd2">vk_mem_alloc.h</a>
</li>
@ -80,6 +82,27 @@ $(function() {
<li>VMA_ALLOCATION_CREATE_NEVER_ALLOCATE_BIT
: <a class="el" href="vk__mem__alloc_8h.html#ad9889c10c798b040d59c92f257cae597a89759603401014eb325eb22a3839f2ff">vk_mem_alloc.h</a>
</li>
<li>VMA_ALLOCATION_CREATE_STRATEGY_BEST_FIT_BIT
: <a class="el" href="vk__mem__alloc_8h.html#ad9889c10c798b040d59c92f257cae597a839826775c62319466441f86496f036d">vk_mem_alloc.h</a>
</li>
<li>VMA_ALLOCATION_CREATE_STRATEGY_FIRST_FIT_BIT
: <a class="el" href="vk__mem__alloc_8h.html#ad9889c10c798b040d59c92f257cae597a33eb2052674f3ad92386c714a65fb777">vk_mem_alloc.h</a>
</li>
<li>VMA_ALLOCATION_CREATE_STRATEGY_MASK
: <a class="el" href="vk__mem__alloc_8h.html#ad9889c10c798b040d59c92f257cae597a8e16845d81ae3d27c47106d4770d5c7e">vk_mem_alloc.h</a>
</li>
<li>VMA_ALLOCATION_CREATE_STRATEGY_MIN_FRAGMENTATION_BIT
: <a class="el" href="vk__mem__alloc_8h.html#ad9889c10c798b040d59c92f257cae597a621b704103eb3360230c860acf36e706">vk_mem_alloc.h</a>
</li>
<li>VMA_ALLOCATION_CREATE_STRATEGY_MIN_MEMORY_BIT
: <a class="el" href="vk__mem__alloc_8h.html#ad9889c10c798b040d59c92f257cae597a8af1210cf591784afa026d94998f735d">vk_mem_alloc.h</a>
</li>
<li>VMA_ALLOCATION_CREATE_STRATEGY_MIN_TIME_BIT
: <a class="el" href="vk__mem__alloc_8h.html#ad9889c10c798b040d59c92f257cae597a0729e932b7ea170e3a128cad96c5cf6d">vk_mem_alloc.h</a>
</li>
<li>VMA_ALLOCATION_CREATE_STRATEGY_WORST_FIT_BIT
: <a class="el" href="vk__mem__alloc_8h.html#ad9889c10c798b040d59c92f257cae597ad242a04f802e25fef0b880afe8bb0a62">vk_mem_alloc.h</a>
</li>
<li>VMA_ALLOCATION_CREATE_UPPER_ADDRESS_BIT
: <a class="el" href="vk__mem__alloc_8h.html#ad9889c10c798b040d59c92f257cae597a42ba3a2d2c7117953210b7c3ef8da0df">vk_mem_alloc.h</a>
</li>
@ -113,6 +136,12 @@ $(function() {
<li>VMA_MEMORY_USAGE_UNKNOWN
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<li>VMA_POOL_CREATE_BUDDY_ALGORITHM_BIT
: <a class="el" href="vk__mem__alloc_8h.html#a9a7c45f9c863695d98c83fa5ac940fe7a97a0dc38e5161b780594d998d313d35e">vk_mem_alloc.h</a>
</li>
<li>VMA_POOL_CREATE_FLAG_BITS_MAX_ENUM
: <a class="el" href="vk__mem__alloc_8h.html#a9a7c45f9c863695d98c83fa5ac940fe7a1c7312bea9ea246846b9054fd6bd6aec">vk_mem_alloc.h</a>
</li>

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@ -102,6 +102,7 @@ Table of contents</h1>
<li><a class="el" href="custom_memory_pools.html#linear_algorithm_ring_buffer">Ring buffer</a></li>
</ul>
</li>
<li><a class="el" href="custom_memory_pools.html#buddy_algorithm">Buddy allocation algorithm</a></li>
</ul>
</li>
<li><a class="el" href="defragmentation.html">Defragmentation</a></li>

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@ -65,5 +65,6 @@ var menudata={children:[
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@ -115,12 +115,10 @@ Classes</h2></td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="define-members"></a>
Macros</h2></td></tr>
<tr class="memitem:a1f0c126759fc96ccb6e2d23c101d770c"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="vk__mem__alloc_8h.html#a1f0c126759fc96ccb6e2d23c101d770c">VMA_RECORDING_ENABLED</a>&#160;&#160;&#160;0</td></tr>
<tr class="separator:a1f0c126759fc96ccb6e2d23c101d770c"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a9f918755b601cf4bffca775992e6fb90"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="vk__mem__alloc_8h.html#a9f918755b601cf4bffca775992e6fb90">NOMINMAX</a></td></tr>
<tr class="separator:a9f918755b601cf4bffca775992e6fb90"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:af7b860e63b96d11e44ae8587ba06bbf4"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="vk__mem__alloc_8h.html#af7b860e63b96d11e44ae8587ba06bbf4">VMA_DEDICATED_ALLOCATION</a>&#160;&#160;&#160;0</td></tr>
<tr class="separator:af7b860e63b96d11e44ae8587ba06bbf4"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a1f0c126759fc96ccb6e2d23c101d770c"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="vk__mem__alloc_8h.html#a1f0c126759fc96ccb6e2d23c101d770c">VMA_RECORDING_ENABLED</a>&#160;&#160;&#160;0</td></tr>
<tr class="separator:a1f0c126759fc96ccb6e2d23c101d770c"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ae25f0d55fd91cb166f002b63244800e1"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="vk__mem__alloc_8h.html#ae25f0d55fd91cb166f002b63244800e1">VMA_STATS_STRING_ENABLED</a>&#160;&#160;&#160;1</td></tr>
<tr class="separator:ae25f0d55fd91cb166f002b63244800e1"><td class="memSeparator" colspan="2">&#160;</td></tr>
</table><table class="memberdecls">
@ -223,14 +221,28 @@ Enumerations</h2></td></tr>
&#160;&#160;<a class="el" href="vk__mem__alloc_8h.html#ad9889c10c798b040d59c92f257cae597a68686d0ce9beb0d4d1b9f2b8b1389a7e">VMA_ALLOCATION_CREATE_CAN_MAKE_OTHER_LOST_BIT</a> = 0x00000010,
<a class="el" href="vk__mem__alloc_8h.html#ad9889c10c798b040d59c92f257cae597aa6f24f821cd6a7c5e4a443f7bf59c520">VMA_ALLOCATION_CREATE_USER_DATA_COPY_STRING_BIT</a> = 0x00000020,
<a class="el" href="vk__mem__alloc_8h.html#ad9889c10c798b040d59c92f257cae597a42ba3a2d2c7117953210b7c3ef8da0df">VMA_ALLOCATION_CREATE_UPPER_ADDRESS_BIT</a> = 0x00000040,
<a class="el" href="vk__mem__alloc_8h.html#ad9889c10c798b040d59c92f257cae597a839826775c62319466441f86496f036d">VMA_ALLOCATION_CREATE_STRATEGY_BEST_FIT_BIT</a> = 0x00010000,
<br />
&#160;&#160;<a class="el" href="vk__mem__alloc_8h.html#ad9889c10c798b040d59c92f257cae597ad242a04f802e25fef0b880afe8bb0a62">VMA_ALLOCATION_CREATE_STRATEGY_WORST_FIT_BIT</a> = 0x00020000,
<a class="el" href="vk__mem__alloc_8h.html#ad9889c10c798b040d59c92f257cae597a33eb2052674f3ad92386c714a65fb777">VMA_ALLOCATION_CREATE_STRATEGY_FIRST_FIT_BIT</a> = 0x00040000,
<a class="el" href="vk__mem__alloc_8h.html#ad9889c10c798b040d59c92f257cae597a8af1210cf591784afa026d94998f735d">VMA_ALLOCATION_CREATE_STRATEGY_MIN_MEMORY_BIT</a> = VMA_ALLOCATION_CREATE_STRATEGY_BEST_FIT_BIT,
<a class="el" href="vk__mem__alloc_8h.html#ad9889c10c798b040d59c92f257cae597a0729e932b7ea170e3a128cad96c5cf6d">VMA_ALLOCATION_CREATE_STRATEGY_MIN_TIME_BIT</a> = VMA_ALLOCATION_CREATE_STRATEGY_FIRST_FIT_BIT,
<br />
&#160;&#160;<a class="el" href="vk__mem__alloc_8h.html#ad9889c10c798b040d59c92f257cae597a621b704103eb3360230c860acf36e706">VMA_ALLOCATION_CREATE_STRATEGY_MIN_FRAGMENTATION_BIT</a> = VMA_ALLOCATION_CREATE_STRATEGY_WORST_FIT_BIT,
<a class="el" href="vk__mem__alloc_8h.html#ad9889c10c798b040d59c92f257cae597a8e16845d81ae3d27c47106d4770d5c7e">VMA_ALLOCATION_CREATE_STRATEGY_MASK</a>,
<a class="el" href="vk__mem__alloc_8h.html#ad9889c10c798b040d59c92f257cae597ae5633ec569f4899cf8f29e7385b2f882">VMA_ALLOCATION_CREATE_FLAG_BITS_MAX_ENUM</a> = 0x7FFFFFFF
<br />
}</td></tr>
<tr class="memdesc:ad9889c10c798b040d59c92f257cae597"><td class="mdescLeft">&#160;</td><td class="mdescRight">Flags to be passed as <a class="el" href="struct_vma_allocation_create_info.html#add09658ac14fe290ace25470ddd6d41b" title="Use VmaAllocationCreateFlagBits enum. ">VmaAllocationCreateInfo::flags</a>. <a href="vk__mem__alloc_8h.html#ad9889c10c798b040d59c92f257cae597">More...</a><br /></td></tr>
<tr class="separator:ad9889c10c798b040d59c92f257cae597"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a9a7c45f9c863695d98c83fa5ac940fe7"><td class="memItemLeft" align="right" valign="top">enum &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="vk__mem__alloc_8h.html#a9a7c45f9c863695d98c83fa5ac940fe7">VmaPoolCreateFlagBits</a> { <a class="el" href="vk__mem__alloc_8h.html#a9a7c45f9c863695d98c83fa5ac940fe7a9f1a499508a8edb4e8ba40aa0290a3d2">VMA_POOL_CREATE_IGNORE_BUFFER_IMAGE_GRANULARITY_BIT</a> = 0x00000002,
<tr class="memitem:a9a7c45f9c863695d98c83fa5ac940fe7"><td class="memItemLeft" align="right" valign="top">enum &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="vk__mem__alloc_8h.html#a9a7c45f9c863695d98c83fa5ac940fe7">VmaPoolCreateFlagBits</a> { <br />
&#160;&#160;<a class="el" href="vk__mem__alloc_8h.html#a9a7c45f9c863695d98c83fa5ac940fe7a9f1a499508a8edb4e8ba40aa0290a3d2">VMA_POOL_CREATE_IGNORE_BUFFER_IMAGE_GRANULARITY_BIT</a> = 0x00000002,
<a class="el" href="vk__mem__alloc_8h.html#a9a7c45f9c863695d98c83fa5ac940fe7a13c8a444197c67866be9cb05599fc726">VMA_POOL_CREATE_LINEAR_ALGORITHM_BIT</a> = 0x00000004,
<a class="el" href="vk__mem__alloc_8h.html#a9a7c45f9c863695d98c83fa5ac940fe7a1c7312bea9ea246846b9054fd6bd6aec">VMA_POOL_CREATE_FLAG_BITS_MAX_ENUM</a> = 0x7FFFFFFF
<a class="el" href="vk__mem__alloc_8h.html#a9a7c45f9c863695d98c83fa5ac940fe7a97a0dc38e5161b780594d998d313d35e">VMA_POOL_CREATE_BUDDY_ALGORITHM_BIT</a> = 0x00000008,
<a class="el" href="vk__mem__alloc_8h.html#a9a7c45f9c863695d98c83fa5ac940fe7af4d270f8f42517a0f70037ceb6ac1d9c">VMA_POOL_CREATE_ALGORITHM_MASK</a>,
<br />
&#160;&#160;<a class="el" href="vk__mem__alloc_8h.html#a9a7c45f9c863695d98c83fa5ac940fe7a1c7312bea9ea246846b9054fd6bd6aec">VMA_POOL_CREATE_FLAG_BITS_MAX_ENUM</a> = 0x7FFFFFFF
<br />
}</td></tr>
<tr class="memdesc:a9a7c45f9c863695d98c83fa5ac940fe7"><td class="mdescLeft">&#160;</td><td class="mdescRight">Flags to be passed as <a class="el" href="struct_vma_pool_create_info.html#a8405139f63d078340ae74513a59f5446" title="Use combination of VmaPoolCreateFlagBits. ">VmaPoolCreateInfo::flags</a>. <a href="vk__mem__alloc_8h.html#a9a7c45f9c863695d98c83fa5ac940fe7">More...</a><br /></td></tr>
<tr class="separator:a9a7c45f9c863695d98c83fa5ac940fe7"><td class="memSeparator" colspan="2">&#160;</td></tr>
@ -345,20 +357,6 @@ Functions</h2></td></tr>
<tr class="separator:ae50d2cb3b4a3bfd4dd40987234e50e7e"><td class="memSeparator" colspan="2">&#160;</td></tr>
</table>
<h2 class="groupheader">Macro Definition Documentation</h2>
<a id="a9f918755b601cf4bffca775992e6fb90"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a9f918755b601cf4bffca775992e6fb90">&#9670;&nbsp;</a></span>NOMINMAX</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">#define NOMINMAX</td>
</tr>
</table>
</div><div class="memdoc">
</div>
</div>
<a id="af7b860e63b96d11e44ae8587ba06bbf4"></a>
<h2 class="memtitle"><span class="permalink"><a href="#af7b860e63b96d11e44ae8587ba06bbf4">&#9670;&nbsp;</a></span>VMA_DEDICATED_ALLOCATION</h2>
@ -804,6 +802,20 @@ Functions</h2></td></tr>
<tr><td class="fieldname"><a id="ad9889c10c798b040d59c92f257cae597a42ba3a2d2c7117953210b7c3ef8da0df"></a>VMA_ALLOCATION_CREATE_UPPER_ADDRESS_BIT&#160;</td><td class="fielddoc"><p>Allocation will be created from upper stack in a double stack pool.</p>
<p>This flag is only allowed for custom pools created with <a class="el" href="vk__mem__alloc_8h.html#a9a7c45f9c863695d98c83fa5ac940fe7a13c8a444197c67866be9cb05599fc726" title="Enables alternative, linear allocation algorithm in this pool. ">VMA_POOL_CREATE_LINEAR_ALGORITHM_BIT</a> flag. </p>
</td></tr>
<tr><td class="fieldname"><a id="ad9889c10c798b040d59c92f257cae597a839826775c62319466441f86496f036d"></a>VMA_ALLOCATION_CREATE_STRATEGY_BEST_FIT_BIT&#160;</td><td class="fielddoc"><p>Allocation strategy that chooses smallest possible free range for the allocation. </p>
</td></tr>
<tr><td class="fieldname"><a id="ad9889c10c798b040d59c92f257cae597ad242a04f802e25fef0b880afe8bb0a62"></a>VMA_ALLOCATION_CREATE_STRATEGY_WORST_FIT_BIT&#160;</td><td class="fielddoc"><p>Allocation strategy that chooses biggest possible free range for the allocation. </p>
</td></tr>
<tr><td class="fieldname"><a id="ad9889c10c798b040d59c92f257cae597a33eb2052674f3ad92386c714a65fb777"></a>VMA_ALLOCATION_CREATE_STRATEGY_FIRST_FIT_BIT&#160;</td><td class="fielddoc"><p>Allocation strategy that chooses first suitable free range for the allocation. </p>
</td></tr>
<tr><td class="fieldname"><a id="ad9889c10c798b040d59c92f257cae597a8af1210cf591784afa026d94998f735d"></a>VMA_ALLOCATION_CREATE_STRATEGY_MIN_MEMORY_BIT&#160;</td><td class="fielddoc"><p>Allocation strategy that tries to minimize memory usage. </p>
</td></tr>
<tr><td class="fieldname"><a id="ad9889c10c798b040d59c92f257cae597a0729e932b7ea170e3a128cad96c5cf6d"></a>VMA_ALLOCATION_CREATE_STRATEGY_MIN_TIME_BIT&#160;</td><td class="fielddoc"><p>Allocation strategy that tries to minimize allocation time. </p>
</td></tr>
<tr><td class="fieldname"><a id="ad9889c10c798b040d59c92f257cae597a621b704103eb3360230c860acf36e706"></a>VMA_ALLOCATION_CREATE_STRATEGY_MIN_FRAGMENTATION_BIT&#160;</td><td class="fielddoc"><p>Allocation strategy that tries to minimize memory fragmentation. </p>
</td></tr>
<tr><td class="fieldname"><a id="ad9889c10c798b040d59c92f257cae597a8e16845d81ae3d27c47106d4770d5c7e"></a>VMA_ALLOCATION_CREATE_STRATEGY_MASK&#160;</td><td class="fielddoc"><p>A bit mask to extract only <code>STRATEGY</code> bits from entire set of flags. </p>
</td></tr>
<tr><td class="fieldname"><a id="ad9889c10c798b040d59c92f257cae597ae5633ec569f4899cf8f29e7385b2f882"></a>VMA_ALLOCATION_CREATE_FLAG_BITS_MAX_ENUM&#160;</td><td class="fielddoc"></td></tr>
</table>
@ -900,12 +912,19 @@ Functions</h2></td></tr>
<tr><th colspan="2">Enumerator</th></tr><tr><td class="fieldname"><a id="a9a7c45f9c863695d98c83fa5ac940fe7a9f1a499508a8edb4e8ba40aa0290a3d2"></a>VMA_POOL_CREATE_IGNORE_BUFFER_IMAGE_GRANULARITY_BIT&#160;</td><td class="fielddoc"><p>Use this flag if you always allocate only buffers and linear images or only optimal images out of this pool and so Buffer-Image Granularity can be ignored. </p>
<p>This is an optional optimization flag.</p>
<p>If you always allocate using <a class="el" href="vk__mem__alloc_8h.html#ac72ee55598617e8eecca384e746bab51">vmaCreateBuffer()</a>, <a class="el" href="vk__mem__alloc_8h.html#a02a94f25679275851a53e82eacbcfc73" title="Function similar to vmaCreateBuffer(). ">vmaCreateImage()</a>, <a class="el" href="vk__mem__alloc_8h.html#a7fdf64415b6c3d83c454f28d2c53df7b">vmaAllocateMemoryForBuffer()</a>, then you don't need to use it because allocator knows exact type of your allocations so it can handle Buffer-Image Granularity in the optimal way.</p>
<p>If you also allocate using <a class="el" href="vk__mem__alloc_8h.html#a0faa3f9e5fb233d29d1e00390650febb" title="Function similar to vmaAllocateMemoryForBuffer(). ">vmaAllocateMemoryForImage()</a> or <a class="el" href="vk__mem__alloc_8h.html#abf28077dbf82d0908b8acbe8ee8dd9b8" title="General purpose memory allocation. ">vmaAllocateMemory()</a>, exact type of such allocations is not known, so allocator must be conservative in handling Buffer-Image Granularity, which can lead to suboptimal allocation (wasted memory). In that case, if you can make sure you always allocate only buffers and linear images or only optimal images out of this pool, use this flag to make allocator disregard Buffer-Image Granularity and so make allocations more optimal. </p>
<p>If you also allocate using <a class="el" href="vk__mem__alloc_8h.html#a0faa3f9e5fb233d29d1e00390650febb" title="Function similar to vmaAllocateMemoryForBuffer(). ">vmaAllocateMemoryForImage()</a> or <a class="el" href="vk__mem__alloc_8h.html#abf28077dbf82d0908b8acbe8ee8dd9b8" title="General purpose memory allocation. ">vmaAllocateMemory()</a>, exact type of such allocations is not known, so allocator must be conservative in handling Buffer-Image Granularity, which can lead to suboptimal allocation (wasted memory). In that case, if you can make sure you always allocate only buffers and linear images or only optimal images out of this pool, use this flag to make allocator disregard Buffer-Image Granularity and so make allocations faster and more optimal. </p>
</td></tr>
<tr><td class="fieldname"><a id="a9a7c45f9c863695d98c83fa5ac940fe7a13c8a444197c67866be9cb05599fc726"></a>VMA_POOL_CREATE_LINEAR_ALGORITHM_BIT&#160;</td><td class="fielddoc"><p>Enables alternative, linear allocation algorithm in this pool. </p>
<p>Specify this flag to enable linear allocation algorithm, which always creates new allocations after last one and doesn't reuse space from allocations freed in between. It trades memory consumption for simplified algorithm and data structure, which has better performance and uses less memory for metadata.</p>
<p>By using this flag, you can achieve behavior of free-at-once, stack, ring buffer, and double stack. For details, see documentation chapter <a class="el" href="custom_memory_pools.html#linear_algorithm">Linear allocation algorithm</a>.</p>
<p>When using this flag, you must specify <a class="el" href="struct_vma_pool_create_info.html#ae41142f2834fcdc82baa4883c187b75c" title="Maximum number of blocks that can be allocated in this pool. Optional. ">VmaPoolCreateInfo::maxBlockCount</a> == 1 (or 0 for default). </p>
<p>When using this flag, you must specify <a class="el" href="struct_vma_pool_create_info.html#ae41142f2834fcdc82baa4883c187b75c" title="Maximum number of blocks that can be allocated in this pool. Optional. ">VmaPoolCreateInfo::maxBlockCount</a> == 1 (or 0 for default).</p>
<p>For more details, see <a class="el" href="custom_memory_pools.html#linear_algorithm">Linear allocation algorithm</a>. </p>
</td></tr>
<tr><td class="fieldname"><a id="a9a7c45f9c863695d98c83fa5ac940fe7a97a0dc38e5161b780594d998d313d35e"></a>VMA_POOL_CREATE_BUDDY_ALGORITHM_BIT&#160;</td><td class="fielddoc"><p>Enables alternative, buddy allocation algorithm in this pool. </p>
<p>It operates on a tree of blocks, each having size that is a power of two and a half of its parent's size. Comparing to default algorithm, this one provides faster allocation and deallocation and decreased external fragmentation, at the expense of more memory wasted (internal fragmentation).</p>
<p>For more details, see <a class="el" href="custom_memory_pools.html#buddy_algorithm">Buddy allocation algorithm</a>. </p>
</td></tr>
<tr><td class="fieldname"><a id="a9a7c45f9c863695d98c83fa5ac940fe7af4d270f8f42517a0f70037ceb6ac1d9c"></a>VMA_POOL_CREATE_ALGORITHM_MASK&#160;</td><td class="fielddoc"><p>Bit mask to extract only <code>ALGORITHM</code> bits from entire set of flags. </p>
</td></tr>
<tr><td class="fieldname"><a id="a9a7c45f9c863695d98c83fa5ac940fe7a1c7312bea9ea246846b9054fd6bd6aec"></a>VMA_POOL_CREATE_FLAG_BITS_MAX_ENUM&#160;</td><td class="fielddoc"></td></tr>
</table>
@ -1619,7 +1638,7 @@ Functions</h2></td></tr>
<p>This function works by moving allocations to different places (different <code>VkDeviceMemory</code> objects and/or different offsets) in order to optimize memory usage. Only allocations that are in pAllocations array can be moved. All other allocations are considered nonmovable in this call. Basic rules:</p>
<ul>
<li>Only allocations made in memory types that have <code>VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT</code> and <code>VK_MEMORY_PROPERTY_HOST_COHERENT_BIT</code> flags can be compacted. You may pass other allocations but it makes no sense - these will never be moved.</li>
<li>Custom pools created with <a class="el" href="vk__mem__alloc_8h.html#a9a7c45f9c863695d98c83fa5ac940fe7a13c8a444197c67866be9cb05599fc726" title="Enables alternative, linear allocation algorithm in this pool. ">VMA_POOL_CREATE_LINEAR_ALGORITHM_BIT</a> flag are not defragmented. Allocations passed to this function that come from such pools are ignored.</li>
<li>Custom pools created with <a class="el" href="vk__mem__alloc_8h.html#a9a7c45f9c863695d98c83fa5ac940fe7a13c8a444197c67866be9cb05599fc726" title="Enables alternative, linear allocation algorithm in this pool. ">VMA_POOL_CREATE_LINEAR_ALGORITHM_BIT</a> or <a class="el" href="vk__mem__alloc_8h.html#a9a7c45f9c863695d98c83fa5ac940fe7a97a0dc38e5161b780594d998d313d35e" title="Enables alternative, buddy allocation algorithm in this pool. ">VMA_POOL_CREATE_BUDDY_ALGORITHM_BIT</a> flag are not defragmented. Allocations passed to this function that come from such pools are ignored.</li>
<li>Allocations created with <a class="el" href="vk__mem__alloc_8h.html#ad9889c10c798b040d59c92f257cae597a3fc311d855c2ff53f1090ef5c722b38f" title="Set this flag if the allocation should have its own memory block. ">VMA_ALLOCATION_CREATE_DEDICATED_MEMORY_BIT</a> or created as dedicated allocations for any other reason are also ignored.</li>
<li>Both allocations made with or without <a class="el" href="vk__mem__alloc_8h.html#ad9889c10c798b040d59c92f257cae597a11da372cc3a82931c5e5d6146cd9dd1f" title="Set this flag to use a memory that will be persistently mapped and retrieve pointer to it...">VMA_ALLOCATION_CREATE_MAPPED_BIT</a> flag can be compacted. If not persistently mapped, memory will be mapped temporarily inside this function if needed.</li>
<li>You must not pass same <a class="el" href="struct_vma_allocation.html" title="Represents single memory allocation. ">VmaAllocation</a> object multiple times in pAllocations array.</li>

251
docs/html/vk__mem__alloc_8h_source.html
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375
src/Tests.cpp
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@ -7,6 +7,8 @@
#ifdef _WIN32
static const char* CODE_DESCRIPTION = "Foo";
enum CONFIG_TYPE {
CONFIG_TYPE_MINIMUM,
CONFIG_TYPE_SMALL,
@ -16,17 +18,34 @@ enum CONFIG_TYPE {
CONFIG_TYPE_COUNT
};
static constexpr CONFIG_TYPE ConfigType = CONFIG_TYPE_SMALL;
//static constexpr CONFIG_TYPE ConfigType = CONFIG_TYPE_LARGE;
//static constexpr CONFIG_TYPE ConfigType = CONFIG_TYPE_SMALL;
static constexpr CONFIG_TYPE ConfigType = CONFIG_TYPE_LARGE;
enum class FREE_ORDER { FORWARD, BACKWARD, RANDOM, COUNT };
static const wchar_t* FREE_ORDER_NAMES[] = {
L"FORWARD",
L"BACKWARD",
L"RANDOM",
static const char* FREE_ORDER_NAMES[] = {
"FORWARD",
"BACKWARD",
"RANDOM",
};
// Copy of internal VmaAlgorithmToStr.
static const char* AlgorithmToStr(uint32_t algorithm)
{
switch(algorithm)
{
case VMA_POOL_CREATE_LINEAR_ALGORITHM_BIT:
return "Linear";
case VMA_POOL_CREATE_BUDDY_ALGORITHM_BIT:
return "Buddy";
case 0:
return "Default";
default:
assert(0);
return "";
}
}
struct AllocationSize
{
uint32_t Probability;
@ -45,6 +64,7 @@ struct Config
uint32_t ThreadCount;
uint32_t ThreadsUsingCommonAllocationsProbabilityPercent;
FREE_ORDER FreeOrder;
VmaAllocationCreateFlags AllocationStrategy; // For VMA_ALLOCATION_CREATE_STRATEGY_*
};
struct Result
@ -127,6 +147,33 @@ struct BufferInfo
VmaAllocation Allocation = VK_NULL_HANDLE;
};
static uint32_t GetAllocationStrategyCount()
{
uint32_t strategyCount = 0;
switch(ConfigType)
{
case CONFIG_TYPE_MINIMUM: strategyCount = 1; break;
case CONFIG_TYPE_SMALL: strategyCount = 1; break;
case CONFIG_TYPE_AVERAGE: strategyCount = 2; break;
case CONFIG_TYPE_LARGE: strategyCount = 2; break;
case CONFIG_TYPE_MAXIMUM: strategyCount = 3; break;
default: assert(0);
}
return strategyCount;
}
static const char* GetAllocationStrategyName(VmaAllocationCreateFlags allocStrategy)
{
switch(allocStrategy)
{
case VMA_ALLOCATION_CREATE_STRATEGY_BEST_FIT_BIT: return "BEST_FIT"; break;
case VMA_ALLOCATION_CREATE_STRATEGY_WORST_FIT_BIT: return "WORST_FIT"; break;
case VMA_ALLOCATION_CREATE_STRATEGY_FIRST_FIT_BIT: return "FIRST_FIT"; break;
case 0: return "Default"; break;
default: assert(0); return "";
}
}
static void InitResult(Result& outResult)
{
outResult.TotalTime = duration::zero();
@ -212,6 +259,15 @@ public:
}
};
static void CurrentTimeToStr(std::string& out)
{
time_t rawTime; time(&rawTime);
struct tm timeInfo; localtime_s(&timeInfo, &rawTime);
char timeStr[128];
strftime(timeStr, _countof(timeStr), "%c", &timeInfo);
out = timeStr;
}
VkResult MainTest(Result& outResult, const Config& config)
{
assert(config.ThreadCount > 0);
@ -264,6 +320,7 @@ VkResult MainTest(Result& outResult, const Config& config)
VmaAllocationCreateInfo memReq = {};
memReq.usage = (VmaMemoryUsage)(VMA_MEMORY_USAGE_GPU_ONLY + memUsageIndex);
memReq.flags |= config.AllocationStrategy;
Allocation allocation = {};
VmaAllocationInfo allocationInfo;
@ -1002,7 +1059,7 @@ void TestDefragmentationFull()
for(size_t i = 0; i < allocations.size(); ++i)
ValidateAllocationData(allocations[i]);
SaveAllocatorStatsToFile(L"Before.csv");
//SaveAllocatorStatsToFile(L"Before.csv");
{
std::vector<VmaAllocation> vmaAllocations(allocations.size());
@ -1051,9 +1108,9 @@ void TestDefragmentationFull()
for(size_t i = 0; i < allocations.size(); ++i)
ValidateAllocationData(allocations[i]);
wchar_t fileName[MAX_PATH];
swprintf(fileName, MAX_PATH, L"After_%02u.csv", defragIndex);
SaveAllocatorStatsToFile(fileName);
//wchar_t fileName[MAX_PATH];
//swprintf(fileName, MAX_PATH, L"After_%02u.csv", defragIndex);
//SaveAllocatorStatsToFile(fileName);
}
}
@ -2091,7 +2148,11 @@ static void ManuallyTestLinearAllocator()
vmaDestroyPool(g_hAllocator, pool);
}
static void BenchmarkLinearAllocatorCase(bool linear, bool empty, FREE_ORDER freeOrder)
static void BenchmarkAlgorithmsCase(FILE* file,
uint32_t algorithm,
bool empty,
VmaAllocationCreateFlags allocStrategy,
FREE_ORDER freeOrder)
{
RandomNumberGenerator rand{16223};
@ -2112,8 +2173,7 @@ static void BenchmarkLinearAllocatorCase(bool linear, bool empty, FREE_ORDER fre
assert(res == VK_SUCCESS);
poolCreateInfo.blockSize = bufSizeMax * maxBufCapacity;
if(linear)
poolCreateInfo.flags = VMA_POOL_CREATE_LINEAR_ALGORITHM_BIT;
poolCreateInfo.flags |= algorithm;
poolCreateInfo.minBlockCount = poolCreateInfo.maxBlockCount = 1;
VmaPool pool = nullptr;
@ -2132,6 +2192,7 @@ static void BenchmarkLinearAllocatorCase(bool linear, bool empty, FREE_ORDER fre
VmaAllocationCreateInfo allocCreateInfo = {};
allocCreateInfo.pool = pool;
allocCreateInfo.flags = allocStrategy;
VmaAllocation alloc;
std::vector<VmaAllocation> baseAllocations;
@ -2210,17 +2271,44 @@ static void BenchmarkLinearAllocatorCase(bool linear, bool empty, FREE_ORDER fre
vmaDestroyPool(g_hAllocator, pool);
wprintf(L" LinearAlgorithm=%u %s FreeOrder=%s: allocations %g s, free %g s\n",
linear ? 1 : 0,
empty ? L"Empty" : L"Not empty",
const float allocTotalSeconds = ToFloatSeconds(allocTotalDuration);
const float freeTotalSeconds = ToFloatSeconds(freeTotalDuration);
printf(" Algorithm=%s %s Allocation=%s FreeOrder=%s: allocations %g s, free %g s\n",
AlgorithmToStr(algorithm),
empty ? "Empty" : "Not empty",
GetAllocationStrategyName(allocStrategy),
FREE_ORDER_NAMES[(size_t)freeOrder],
ToFloatSeconds(allocTotalDuration),
ToFloatSeconds(freeTotalDuration));
allocTotalSeconds,
freeTotalSeconds);
if(file)
{
std::string currTime;
CurrentTimeToStr(currTime);
fprintf(file, "%s,%s,%s,%u,%s,%s,%g,%g\n",
CODE_DESCRIPTION, currTime.c_str(),
AlgorithmToStr(algorithm),
empty ? 1 : 0,
GetAllocationStrategyName(allocStrategy),
FREE_ORDER_NAMES[(uint32_t)freeOrder],
allocTotalSeconds,
freeTotalSeconds);
}
}
static void BenchmarkLinearAllocator()
static void BenchmarkAlgorithms(FILE* file)
{
wprintf(L"Benchmark linear allocator\n");
wprintf(L"Benchmark algorithms\n");
if(file)
{
fprintf(file,
"Code,Time,"
"Algorithm,Empty,Allocation strategy,Free order,"
"Allocation time (s),Deallocation time (s)\n");
}
uint32_t freeOrderCount = 1;
if(ConfigType >= CONFIG_TYPE::CONFIG_TYPE_LARGE)
@ -2229,6 +2317,7 @@ static void BenchmarkLinearAllocator()
freeOrderCount = 2;
const uint32_t emptyCount = ConfigType >= CONFIG_TYPE::CONFIG_TYPE_SMALL ? 2 : 1;
const uint32_t allocStrategyCount = GetAllocationStrategyCount();
for(uint32_t freeOrderIndex = 0; freeOrderIndex < freeOrderCount; ++freeOrderIndex)
{
@ -2243,15 +2332,48 @@ static void BenchmarkLinearAllocator()
for(uint32_t emptyIndex = 0; emptyIndex < emptyCount; ++emptyIndex)
{
for(uint32_t linearIndex = 0; linearIndex < 2; ++linearIndex)
for(uint32_t algorithmIndex = 0; algorithmIndex < 3; ++algorithmIndex)
{
BenchmarkLinearAllocatorCase(
linearIndex ? 1 : 0, // linear
uint32_t algorithm = 0;
switch(algorithmIndex)
{
case 0:
break;
case 1:
algorithm = VMA_POOL_CREATE_BUDDY_ALGORITHM_BIT;
break;
case 2:
algorithm = VMA_POOL_CREATE_LINEAR_ALGORITHM_BIT;
break;
default:
assert(0);
}
uint32_t currAllocStrategyCount = algorithm != 0 ? 1 : allocStrategyCount;
for(uint32_t allocStrategyIndex = 0; allocStrategyIndex < currAllocStrategyCount; ++allocStrategyIndex)
{
VmaAllocatorCreateFlags strategy = 0;
if(currAllocStrategyCount > 1)
{
switch(allocStrategyIndex)
{
case 0: strategy = VMA_ALLOCATION_CREATE_STRATEGY_BEST_FIT_BIT; break;
case 1: strategy = VMA_ALLOCATION_CREATE_STRATEGY_WORST_FIT_BIT; break;
case 2: strategy = VMA_ALLOCATION_CREATE_STRATEGY_FIRST_FIT_BIT; break;
default: assert(0);
}
}
BenchmarkAlgorithmsCase(
file,
algorithm,
emptyIndex ? 0 : 1, // empty
strategy,
freeOrder); // freeOrder
}
}
}
}
}
static void TestPool_SameSize()
@ -3316,8 +3438,8 @@ static void TestMappingMultithreaded()
static void WriteMainTestResultHeader(FILE* file)
{
fprintf(file,
"Code,Test,Time,"
"Config,"
"Code,Time,"
"Threads,Buffers and images,Sizes,Operations,Allocation strategy,Free order,"
"Total Time (us),"
"Allocation Time Min (us),"
"Allocation Time Avg (us),"
@ -3344,19 +3466,15 @@ static void WriteMainTestResult(
float deallocationTimeAvgSeconds = ToFloatSeconds(result.DeallocationTimeAvg);
float deallocationTimeMaxSeconds = ToFloatSeconds(result.DeallocationTimeMax);
time_t rawTime; time(&rawTime);
struct tm timeInfo; localtime_s(&timeInfo, &rawTime);
char timeStr[128];
strftime(timeStr, _countof(timeStr), "%c", &timeInfo);
std::string currTime;
CurrentTimeToStr(currTime);
fprintf(file,
"%s,%s,%s,"
"BeginBytesToAllocate=%I64u MaxBytesToAllocate=%I64u AdditionalOperationCount=%u ThreadCount=%u FreeOrder=%d,"
"%.2f,%.2f,%.2f,%.2f,%.2f,%.2f,%.2f,%I64u,%I64u,%I64u\n",
codeDescription,
currTime.c_str(),
testDescription,
timeStr,
config.BeginBytesToAllocate, config.MaxBytesToAllocate, config.AdditionalOperationCount, config.ThreadCount, (uint32_t)config.FreeOrder,
totalTimeSeconds * 1e6f,
allocationTimeMinSeconds * 1e6f,
allocationTimeAvgSeconds * 1e6f,
@ -3402,10 +3520,8 @@ static void WritePoolTestResult(
float deallocationTimeAvgSeconds = ToFloatSeconds(result.DeallocationTimeAvg);
float deallocationTimeMaxSeconds = ToFloatSeconds(result.DeallocationTimeMax);
time_t rawTime; time(&rawTime);
struct tm timeInfo; localtime_s(&timeInfo, &rawTime);
char timeStr[128];
strftime(timeStr, _countof(timeStr), "%c", &timeInfo);
std::string currTime;
CurrentTimeToStr(currTime);
fprintf(file,
"%s,%s,%s,"
@ -3414,7 +3530,7 @@ static void WritePoolTestResult(
// General
codeDescription,
testDescription,
timeStr,
currTime.c_str(),
// Config
config.ThreadCount,
(unsigned long long)config.PoolSize,
@ -3447,6 +3563,7 @@ static void PerformCustomMainTest(FILE* file)
config.FreeOrder = FREE_ORDER::FORWARD;
config.ThreadCount = 16;
config.ThreadsUsingCommonAllocationsProbabilityPercent = 50;
config.AllocationStrategy = 0;
// Buffers
//config.AllocationSizes.push_back({4, 16, 1024});
@ -3500,8 +3617,6 @@ static void PerformCustomPoolTest(FILE* file)
WritePoolTestResult(file, "Code desc", "Test desc", config, result);
}
static const char* CODE_DESCRIPTION = "Foo";
static void PerformMainTests(FILE* file)
{
uint32_t repeatCount = 1;
@ -3522,6 +3637,9 @@ static void PerformMainTests(FILE* file)
case CONFIG_TYPE_MAXIMUM: threadCountCount = 7; break;
default: assert(0);
}
const size_t strategyCount = GetAllocationStrategyCount();
for(size_t threadCountIndex = 0; threadCountIndex < threadCountCount; ++threadCountIndex)
{
std::string desc1;
@ -3575,9 +3693,9 @@ static void PerformMainTests(FILE* file)
std::string desc2 = desc1;
switch(buffersVsImagesIndex)
{
case 0: desc2 += " Buffers"; break;
case 1: desc2 += " Images"; break;
case 2: desc2 += " Buffers+Images"; break;
case 0: desc2 += ",Buffers"; break;
case 1: desc2 += ",Images"; break;
case 2: desc2 += ",Buffers+Images"; break;
default: assert(0);
}
@ -3589,9 +3707,9 @@ static void PerformMainTests(FILE* file)
std::string desc3 = desc2;
switch(smallVsLargeIndex)
{
case 0: desc3 += " Small"; break;
case 1: desc3 += " Large"; break;
case 2: desc3 += " Small+Large"; break;
case 0: desc3 += ",Small"; break;
case 1: desc3 += ",Large"; break;
case 2: desc3 += ",Small+Large"; break;
default: assert(0);
}
@ -3695,22 +3813,22 @@ static void PerformMainTests(FILE* file)
switch(beginBytesToAllocateIndex)
{
case 0:
desc5 += " Allocate_100%";
desc5 += ",Allocate_100%";
config.BeginBytesToAllocate = config.MaxBytesToAllocate;
config.AdditionalOperationCount = 0;
break;
case 1:
desc5 += " Allocate_50%+Operations";
desc5 += ",Allocate_50%+Operations";
config.BeginBytesToAllocate = config.MaxBytesToAllocate * 50 / 100;
config.AdditionalOperationCount = 1024;
break;
case 2:
desc5 += " Allocate_5%+Operations";
desc5 += ",Allocate_5%+Operations";
config.BeginBytesToAllocate = config.MaxBytesToAllocate * 5 / 100;
config.AdditionalOperationCount = 1024;
break;
case 3:
desc5 += " Allocate_95%+Operations";
desc5 += ",Allocate_95%+Operations";
config.BeginBytesToAllocate = config.MaxBytesToAllocate * 95 / 100;
config.AdditionalOperationCount = 1024;
break;
@ -3718,15 +3836,41 @@ static void PerformMainTests(FILE* file)
assert(0);
}
const char* testDescription = desc5.c_str();
for(size_t strategyIndex = 0; strategyIndex < strategyCount; ++strategyIndex)
{
std::string desc6 = desc5;
switch(strategyIndex)
{
case 0:
desc6 += ",BestFit";
config.AllocationStrategy = VMA_ALLOCATION_CREATE_STRATEGY_BEST_FIT_BIT;
break;
case 1:
desc6 += ",WorstFit";
config.AllocationStrategy = VMA_ALLOCATION_CREATE_STRATEGY_WORST_FIT_BIT;
break;
case 2:
desc6 += ",FirstFit";
config.AllocationStrategy = VMA_ALLOCATION_CREATE_STRATEGY_FIRST_FIT_BIT;
break;
default:
assert(0);
}
desc6 += ',';
desc6 += FREE_ORDER_NAMES[(uint32_t)config.FreeOrder];
const char* testDescription = desc6.c_str();
for(size_t repeat = 0; repeat < repeatCount; ++repeat)
{
printf("%s Repeat %u\n", testDescription, (uint32_t)repeat);
printf("%s #%u\n", testDescription, (uint32_t)repeat);
Result result{};
VkResult res = MainTest(result, config);
assert(res == VK_SUCCESS);
if(file)
{
WriteMainTestResult(file, CODE_DESCRIPTION, testDescription, config, result);
}
}
@ -3734,6 +3878,8 @@ static void PerformMainTests(FILE* file)
}
}
}
}
}
}
static void PerformPoolTests(FILE* file)
@ -3947,7 +4093,7 @@ static void PerformPoolTests(FILE* file)
for(size_t repeat = 0; repeat < repeatCount; ++repeat)
{
printf("%s Repeat %u\n", testDescription, (uint32_t)repeat);
printf("%s #%u\n", testDescription, (uint32_t)repeat);
PoolTestResult result{};
g_MemoryAliasingWarningEnabled = false;
@ -3962,6 +4108,111 @@ static void PerformPoolTests(FILE* file)
}
}
static void BasicTestBuddyAllocator()
{
wprintf(L"Basic test buddy allocator\n");
RandomNumberGenerator rand{76543};
VkBufferCreateInfo sampleBufCreateInfo = { VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO };
sampleBufCreateInfo.size = 1024; // Whatever.
sampleBufCreateInfo.usage = VK_BUFFER_USAGE_TRANSFER_DST_BIT | VK_BUFFER_USAGE_VERTEX_BUFFER_BIT;
VmaAllocationCreateInfo sampleAllocCreateInfo = {};
sampleAllocCreateInfo.usage = VMA_MEMORY_USAGE_GPU_ONLY;
VmaPoolCreateInfo poolCreateInfo = {};
VkResult res = vmaFindMemoryTypeIndexForBufferInfo(g_hAllocator, &sampleBufCreateInfo, &sampleAllocCreateInfo, &poolCreateInfo.memoryTypeIndex);
assert(res == VK_SUCCESS);
// Deliberately adding 1023 to test usable size smaller than memory block size.
poolCreateInfo.blockSize = 1024 * 1024 + 1023;
poolCreateInfo.flags = VMA_POOL_CREATE_BUDDY_ALGORITHM_BIT;
//poolCreateInfo.minBlockCount = poolCreateInfo.maxBlockCount = 1;
VmaPool pool = nullptr;
res = vmaCreatePool(g_hAllocator, &poolCreateInfo, &pool);
assert(res == VK_SUCCESS);
VkBufferCreateInfo bufCreateInfo = sampleBufCreateInfo;
VmaAllocationCreateInfo allocCreateInfo = {};
allocCreateInfo.pool = pool;
std::vector<BufferInfo> bufInfo;
BufferInfo newBufInfo;
VmaAllocationInfo allocInfo;
bufCreateInfo.size = 1024 * 256;
res = vmaCreateBuffer(g_hAllocator, &bufCreateInfo, &allocCreateInfo,
&newBufInfo.Buffer, &newBufInfo.Allocation, &allocInfo);
assert(res == VK_SUCCESS);
bufInfo.push_back(newBufInfo);
bufCreateInfo.size = 1024 * 512;
res = vmaCreateBuffer(g_hAllocator, &bufCreateInfo, &allocCreateInfo,
&newBufInfo.Buffer, &newBufInfo.Allocation, &allocInfo);
assert(res == VK_SUCCESS);
bufInfo.push_back(newBufInfo);
bufCreateInfo.size = 1024 * 128;
res = vmaCreateBuffer(g_hAllocator, &bufCreateInfo, &allocCreateInfo,
&newBufInfo.Buffer, &newBufInfo.Allocation, &allocInfo);
assert(res == VK_SUCCESS);
bufInfo.push_back(newBufInfo);
// Test very small allocation, smaller than minimum node size.
bufCreateInfo.size = 1;
res = vmaCreateBuffer(g_hAllocator, &bufCreateInfo, &allocCreateInfo,
&newBufInfo.Buffer, &newBufInfo.Allocation, &allocInfo);
assert(res == VK_SUCCESS);
bufInfo.push_back(newBufInfo);
// Test some small allocation with alignment requirement.
{
VkMemoryRequirements memReq;
memReq.alignment = 256;
memReq.memoryTypeBits = UINT32_MAX;
memReq.size = 32;
newBufInfo.Buffer = VK_NULL_HANDLE;
res = vmaAllocateMemory(g_hAllocator, &memReq, &allocCreateInfo,
&newBufInfo.Allocation, &allocInfo);
assert(res == VK_SUCCESS);
assert(allocInfo.offset % memReq.alignment == 0);
bufInfo.push_back(newBufInfo);
}
//SaveAllocatorStatsToFile(L"TEST.json");
VmaPoolStats stats = {};
vmaGetPoolStats(g_hAllocator, pool, &stats);
int DBG = 0; // Set breakpoint here to inspect `stats`.
// Allocate enough new buffers to surely fall into second block.
for(uint32_t i = 0; i < 32; ++i)
{
bufCreateInfo.size = 1024 * (rand.Generate() % 32 + 1);
res = vmaCreateBuffer(g_hAllocator, &bufCreateInfo, &allocCreateInfo,
&newBufInfo.Buffer, &newBufInfo.Allocation, &allocInfo);
assert(res == VK_SUCCESS);
bufInfo.push_back(newBufInfo);
}
SaveAllocatorStatsToFile(L"BuddyTest01.json");
// Destroy the buffers in random order.
while(!bufInfo.empty())
{
const size_t indexToDestroy = rand.Generate() % bufInfo.size();
const BufferInfo& currBufInfo = bufInfo[indexToDestroy];
vmaDestroyBuffer(g_hAllocator, currBufInfo.Buffer, currBufInfo.Allocation);
bufInfo.erase(bufInfo.begin() + indexToDestroy);
}
vmaDestroyPool(g_hAllocator, pool);
}
void Test()
{
wprintf(L"TESTING:\n");
@ -3969,10 +4220,10 @@ void Test()
if(false)
{
// # Temporarily insert custom tests here
TestLinearAllocator();
ManuallyTestLinearAllocator();
TestLinearAllocatorMultiBlock();
BenchmarkLinearAllocator();
// ########################################
// ########################################
BasicTestBuddyAllocator();
return;
}
@ -3993,7 +4244,17 @@ BenchmarkLinearAllocator();
TestLinearAllocator();
ManuallyTestLinearAllocator();
TestLinearAllocatorMultiBlock();
BenchmarkLinearAllocator();
BasicTestBuddyAllocator();
{
FILE* file;
fopen_s(&file, "Algorithms.csv", "w");
assert(file != NULL);
BenchmarkAlgorithms(file);
fclose(file);
}
TestDefragmentationSimple();
TestDefragmentationFull();

1346
src/vk_mem_alloc.h
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21
tools/VmaDumpVis/VmaDumpVis.py
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@ -46,12 +46,11 @@ args = argParser.parse_args()
data = {}
def ProcessBlock(dstBlockList, iBlockId, objBlock, bLinearAlgorithm):
def ProcessBlock(dstBlockList, iBlockId, objBlock, sAlgorithm):
iBlockSize = int(objBlock['TotalBytes'])
arrSuballocs = objBlock['Suballocations']
dstBlockObj = {'ID': iBlockId, 'Size':iBlockSize, 'Suballocations':[]}
if bLinearAlgorithm:
dstBlockObj['LinearAlgorithm'] = True
dstBlockObj['Algorithm'] = sAlgorithm
for objSuballoc in arrSuballocs:
dstBlockObj['Suballocations'].append((objSuballoc['Type'], int(objSuballoc['Size']), int(objSuballoc['Usage']) if ('Usage' in objSuballoc) else 0))
dstBlockList.append(dstBlockObj)
@ -187,18 +186,18 @@ if 'DefaultPools' in jsonSrc:
iType = int(sType[5:])
typeData = GetDataForMemoryType(iType)
for sBlockId, objBlock in tType[1]['Blocks'].items():
ProcessBlock(typeData['DefaultPoolBlocks'], int(sBlockId), objBlock, False)
ProcessBlock(typeData['DefaultPoolBlocks'], int(sBlockId), objBlock, '')
if 'Pools' in jsonSrc:
objPools = jsonSrc['Pools']
for sPoolId, objPool in objPools.items():
iType = int(objPool['MemoryTypeIndex'])
typeData = GetDataForMemoryType(iType)
objBlocks = objPool['Blocks']
bLinearAlgorithm = 'LinearAlgorithm' in objPool and objPool['LinearAlgorithm']
sAlgorithm = objPool.get('Algorithm', '')
dstBlockArray = []
typeData['CustomPools'][int(sPoolId)] = dstBlockArray
for sBlockId, objBlock in objBlocks.items():
ProcessBlock(dstBlockArray, int(sBlockId), objBlock, bLinearAlgorithm)
ProcessBlock(dstBlockArray, int(sBlockId), objBlock, sAlgorithm)
iImgSizeY, fPixelsPerByte = CalcParams()
@ -247,11 +246,11 @@ for iMemTypeIndex in sorted(data.keys()):
index = 0
for iPoolId, listPool in dictMemType['CustomPools'].items():
for objBlock in listPool:
if 'LinearAlgorithm' in objBlock:
linearAlgorithmStr = ' (linear algorithm)';
if 'Algorithm' in objBlock:
sAlgorithm = ' (Algorithm: %s)' % (objBlock['Algorithm']);
else:
linearAlgorithmStr = '';
draw.text((IMG_MARGIN, y), "Custom pool %d%s block %d" % (iPoolId, linearAlgorithmStr, objBlock['ID']), fill=COLOR_TEXT_H2, font=font)
sAlgorithm = '';
draw.text((IMG_MARGIN, y), "Custom pool %d%s block %d" % (iPoolId, sAlgorithm, objBlock['ID']), fill=COLOR_TEXT_H2, font=font)
y += FONT_SIZE + IMG_MARGIN
DrawBlock(draw, y, objBlock)
y += MAP_SIZE + IMG_MARGIN
@ -273,6 +272,6 @@ Main data structure - variable `data` - is a dictionary. Key is integer - memory
- Key is integer pool ID. Value is list of objects representing memory blocks, each containing dictionary with:
- Fixed key 'ID'. Value is int.
- Fixed key 'Size'. Value is int.
- Fixed key 'LinearAlgorithm'. Optional. Value is True.
- Fixed key 'Algorithm'. Optional. Value is string.
- Fixed key 'Suballocations'. Value is list of tuples as above.
"""