tracy/NEWS

Note: There is no guarantee that version mismatched client and server will
be able to talk with each other. Network protocol breakages won't be listed
here.

v0.x.x (xxxx-xx-xx)
-------------------

- Tracy macros now require to be terminated with a semicolon.
- Some text labels in the user interface are now more easy to read.
- The profiler will now instruct the user in the UI on what can be done, if
  the send queue is slow to process (typically due to symbol resolution).
- If a client with an incompatible protocol is discovered, Tracy will now
  try to show which versions can be used to handle the connection.


v0.8.2 (2022-06-28)
-------------------

- Added support for debuginfod debug information services. Note that
  since this depends on proper system configuration, vendors providing
  the debug information, and network retrieval, it is disabled by
  default. To enable, compile the profiled application with the
  TRACY_DEBUGINFOD define and link with libdebuginfod.
- When Tracy server-side utilities are build with MSVC, the required
  libraries will be now automatically retrieved and built with vcpkg.
- Added microarchitecture data for: Bonnell, Airmont, Goldmont, Goldmont
  Plus, Tremont.
- Recognize additional CPUIDs of Zen 3, Alder Lake, Ice Lake
  microarchitectures.
- Assembly line width will be now extended, if needed. Previously the line
  width was calculated for the initial layout and changing amount of
  displayed data (especially listing the read/written registers) didn't
  affect this, which may have made some lines partially unreadable.
- Added ability to filter call stacks in memory tab by inactive allocations.
  Filtering by inactive allocations helps to pinpoint wasteful allocations
  in the program.
- Plot graph will no longer display min/max values interpolated for
  animation, but rather true values.
- The CPU topology tree structure was replaced by a CPU schematic showing
  the same thing in a more concise way.


v0.8.1 (2022-04-21)
-------------------

- Support for pre-0.7 traces has been dropped.
- Update utility can now scan for source files missing in the trace cache,
  if the '-c' parameter is given. Found files will be added to the cache.
- Added high-priority queue for fast queries to bypass slow symbol queries.
- Fixed Android documentation to show how to enable context switch tracing.
- Workaround MSVC 2015 stupidity which prevented compilation as C++11.
- Added support for showing branch cost data for CPUs that don't report
  branch retirement events (but do report branch misses).
- The right-click context menu available for jump arrows in the symbol view
  window will now additionally display jump context, i.e. jump sources and
  jump target source code fragments.
- Added freedesktop.org compliant desktop entry and MIME type definition.
- The call stack column in list of messages will now be only displayed when
  at least one message on the list has call stack data.
- File dialogs on Unix will be now native to the desktop environment you are
  using. Note that this relies on xdg-desktop-portal and dbus.


v0.8.0 (2022-03-28)
-------------------

- Support for Cygwin has been dropped. It was not working for a very long
  time and nobody had complained about it.
- Mingw is deprecated due to lack of interest.
- Added TRACY_NO_CALLSTACK_INLINES macro to disable inline functions
  resolution in call stacks on Windows.
- Improved function matching algorithm in compare traces view.
- Added CMake integration.
- Reworked rpmalloc initialization.
- Fixed display of messages with newlines on messages list.
- Excluded some uninteresting wrapper functions from call stacks (for
  example SIMD pass-through intrinsics to the compiler built-ins).
- Adjusted coloring of instruction hotness in symbol view.
- Properly handle rare cases when sampling on Linux is momentary not able to
  resolve time stamps.
- Added Rocket Lake microarchitectural data.
- Updated CPU identifier lists.
- Implemented GPU timer overflow handling heuristics.
- Assembly instructions are now assigned to inline symbols.
  - You can not only see the assembly source file and line, but also the
    originating function.
  - If symbol view is restricted to a single inline function, all assembly
    instructions not in this context will be dimmed out.
  - Likewise, the navigation in assembly code will be limited just to the
    inline context, if a single function is selected.
- Kernel call stacks will be now properly captured and displayed in the
  profiler. Kernel functions are marked with the red color.
- The CPU hardware performance counters can be now sampled on Linux.
  - Three inferred statistics are displayed for lines in both source and
    assembly code in the symbol view window:
    - Instructions executed per cycle.
    - Branch miss rate.
    - Cache miss rate.
  - Instruction cost estimation method is no longer tied to software call
    stack sampling.
- The image name filter entry field is now providing a list of available
  images.
- Reentrant function calls may be now excluded from calculations in the
  statistics view.
- Crash handler is now properly removed during profiler destruction.
- Repeatedly right-clicking on the same source line in the symbol view
  window will now cycle through assembly blocks associated with this source
  line.
- Vulkan headers must be now explicitly included before including
  TracyVulkan.hpp.
- The capture utility may now limit capture time to a specified number of
  seconds.
- Fixed message thread assignment in the import-chrome utility.
- Sampling data can be now also found in the find zone menu.
- Instrumentation failures may now display their context, e.g. the zone text
  that was to be set.
- A warning is now displayed when sampling data is out-of-order.
- Average value for plots can be now viewed.
- Moved symbol resolution to a separate thread. Profiling will no longer be
  stuck when there is a large number of symbols to resolve. This not only
  improves user experience, but also prevents buildup of data (and memory
  consumption) on the client side.
- Android device name will be now reported.
- Added support for capturing fibers.
  - Fibers require additional processing, which has to be enabled by adding
    the TRACY_FIBERS define on the client side.
  - Client code requires additional instrumentation using the new macros
    TracyFiberEnter and TracyFiberLeave (or the corresponding C API
    variants).
  - Fibers are represented in traces as separate threads, and are
    distinguished by green color. Faux context switch regions are used to
    indicate when a fiber is being run by the worker thread.
- Continuous frame marks no longer need to be issued from a single thread.
- Context switch call stacks are now captured on Windows and Linux.
  - Hovering the context switch wait region will now display wait stack,
    which may provide additional insight into why the switch happened.
  - Wait stacks inspection can be performed in a new view.
    - Stacks can be limited to certain threads and to a selected time range.
    - Stacks are presented either as a sorted list, or as a bottom-up and
      top-down trees.
- Entry call stacks can be now also viewed as a bottom-up and top-down
  trees.
- Updated project build files to MSVC 2022.
- Call stack tooltips now also show the executable image name.
- Playback frames can be now changed by interacting with the frame image
  slider using the mouse wheel.
- Signal used to handle crashes on Linux can be now redefined.
- Various DPI scaling improvements.
- User interface can be now scaled in run time.
- Symbol code retrieval now also supports kernel on Windows.
- Added low-level C API interface for GPU zones.
- Symbol child calls can be now listed.
- Replaced "restrict time" in memory window with a proper time range limit.
- Added Alder Lake microarchitectural data.
- Added GPU zone statistics.
- Universal Windows Platform support.
- All call stack related functionality can be now disabled with the
  TRACY_NO_CALLSTACK macro.
- Added ability to add full-view annotations from the annotations list
  window.


v0.7.8 (2021-05-19)
-------------------

- Updated Zen 3 and added Tiger Lake microarchitectural data.
- Manually disconnecting from the server will no longer display erroneous
  warning message.
- Added ability to display sample time spent in child function calls.
- Fixed issue which may have prevented sampling on ARM64.
- Added TRACY_NO_FRAME_IMAGE macro to disable frame image compression
  thread.
- Ctrl and shift keys will now modify mouse wheel zoom speed.
- Improved user experience in the symbol view window.
- Added support for Direct3D 11 instrumentation.
- Vulkan contexts can be now calibrated on Linux.
- Support loading zstd-compressed chrome traces.
- Chrome traces with multiple PID entries (and possibly conflicting TIDs)
  can be now imported.
- Added support for custom source location tag ("loc") in chrome traces.
- Sampling frequency can be now controlled using TRACY_SAMPLING_HZ macro.
- Trace compression can be now selected when saving a trace.
- If a trace cannot be saved, a failure dialog will be displayed.
- Run-time memory usage of frame images can be reduced by calculating
  a compression dictionary. This can be only performed when a trace is saved
  or through the update utility.


v0.7.7 (2021-04-01)
-------------------

- Linux crash handler will now also catch SIGABRT.
- Fixed invalid name assignment to source files discovered client-side.
- Added ability to check if a zone is active (which may be used to avoid
  preparing zone text, etc., as it wouldn't be used anyway).
- Improved sorting behavior of internal vectors.
  - Some data will now be always properly displayed during live capture.
    This was not particularly visible before, as it mainly concerns edge
    cases.
  - Sorting is performed only as needed.
    - In case of plots the performance during live capture may be decreased,
      as these were sorted with at least 0.25 second intervals before. Now
      the sorting is performed every frame.
    - Some other data, which previously was not sorted, is sorted now.
    - In headless capture mode sorting will be only performed when the trace
      is saved to disk.
- Fixed some typos in macros.
- Fixed handling of non-ANSI file names on Windows. You can now name your
  traces 'ęśąćż.tracy' and it should work as intended. This is supported on
  Windows 10 release 1903 and newer.
- Fixed sending GPU context name in on-demand mode.
- Fixed color channel order in ZoneColor() macro.
- Handle failure state when a memory pointer allocation is reported twice,
  without an intermediate free.
- Renamed "call stack parents" to "entry call stacks".
- Display number of entry call stacks in assembly line sample count tooltip.
- Added tooltips with preview of source code in various places in the UI.


v0.7.6 (2021-02-06)
-------------------

- Various fixes in build scripts.
- Fixed a faulty rpmalloc initialization path when the first thing the
  thread did was sending a message with call stack.
- Added fallback timer define for various virtualized environments, which
  may not be able to access the hardware timer registers. This will result
  in usage of timer provided by the standard library, with reduced
  resolution.
- Further OpenCL improvements.
- Updated libbacktrace.
  - Adds Mach-O 64-bit FAT support.
  - Fixes memory corruption when processing Mach-O data.
  - Fixes missing matching entries during binary search.
  - Adds support for MiniDebugInfo.
  - Adds fallback to ELF symbol table if no debug info is available.
  - Various other fixes.
- Store build time of profiled program in captures.
- GPU contexts can be now named.
- Implemented client -> server source code transfer.


v0.7.5 (2021-01-23)
-------------------

- More robust handling of system tracing on Android.
- Added warning dialog when the connection is lost before all needed data
  can be retrieved.
- Fixed handling of NaN plot entries (by skipping them).
- Dynamic zone colors are now supported through the ZoneColor() macro.
- Fixed Arm machine code printout to match the one printed by objdump.
- Fixed client memory corruption when using colored messages.
- Switched to the next-gen ImGui table UI.
  - Table columns can have their order rearranged, can be hidden, can be
    sorted both in ascending and descending order (where appropriate).
  - Table columns state is now preserved between runs.
- Various fixes related to restricting listening to localhost.
- Improved compatibility of ETW tracing with non-MSVC compilers.
- Fixed Vulkan call stack transfer.
- Added support for transient GPU zones (OpenGL, Vulkan, Direct3D 12).
- OpenCL fixes for assert-less builds and non-active zones.
- Added support for thread names and title bar description in traces
  imported from chrome tracing format.


v0.7.4 (2020-11-15)
-------------------

- Added support for user-provided locks to keep dbghelp calls thread-safe.
- Call stacks can be now copied to clipboard.
- Allow more control over which automated captures are performed.
- Added textual descriptions for some assembly instructions.
- Profiler memory usage is now also displayed as a percentage of available
  physical memory.
- Microarchitecture mismatch is now clearly displayed in the source view
  window.
- Added Zen 3 and Cascade Lake microarchitectural data.
- Ghost zones are now supporting all zone coloring modes and namespace
  shortening.
- Extend C API to support memory pools.
- Frame rate targets can be now visually represented on the timeline view.


v0.7.3 (2020-10-06)
-------------------

- Properly support DPI scaling on Linux (requires GLFW 3.3).
- Added early checks for output file validity in the capture utility.
- Improvements to presence broadcast handling.
- Custom zone colors can be optionally ignored.
- Added support for tracking multiple memory pools.
- Memory free failure dialog can now show call stack pointing to the failure
  location.
- Added support for Wayland on Linux.
- If during the first 5 seconds of the trace there are no frames being
  reported, the profiler will switch to following last 5 seconds of the
  trace, instead of displaying three last frames.


v0.7.2 (2020-09-14)
-------------------

- Note: the bitbucket repository is obsolete and will soon stop receiving
  updates. Migrate to https://github.com/wolfpld/tracy, if you haven't
  already.
- The "waiting for connection" dialog no longer has "cancel" button. To
  abort connection attempt just use the "close window" button.
- Added update notification.
- The most recent traced events can be now viewed regardless of timeline
  zoom level.
- Fixed going-to-line in source view (again).
- Crash handling on client is now not performed, if there is no active
  connection.
- Added ability to listen only on IPv4 interfaces.


v0.7.1 (2020-08-24)
-------------------

- Dropped support for pre-v0.6 traces.
- Fixed regression on non-AVX2 CPUs.
- Fixed incorrect calculation of some ghost zones.
- Added list of cached source files.
- Added import of plot data.
- Secure versions of alloc/free macros.
- Automated tracing of vertical synchronization on Windows.
- Fixed attachment of postponed frame images.
- Source location data can be now copied to clipboard from zone info window.
- Zones in find zones menu can be now grouped by zone name.
- Vulkan and D3D12 GPU contexts can be now calibrated.
- Added CSV export utility.
- "Go to frame" popup no longer has a dedicated button. To show it, click on
  the frame counter.
- Added macro for checking if profiler is connected.
- Implemented optional data removal from traces in the update utility.
- Allow manual management of profiler lifetime.
- Adjusted priority of ETW threads to time critical.
- Annotations can be now freely adjusted on the timeline.
- Limiting time range for find zone functionality has been significantly
  improved.
- Added time range limits for statistics and symbol view.
- Implemented call stack sampling on Linux (including Android).
- Exact time from start of profiling session can be now viewed by hovering
  the mouse over the time scale.
- Code transfer can be now compiled-out.
- Added support for zone markup in unloadable modules.
- Added image name filter to sampling statistics results window.


v0.7 (2020-06-11)
-----------------

This is the last release which will be able to load pre-v0.6 traces. Use the
update utility to convert your old traces now!

- chrome:tracing importer now imports zone metadata from "args" key.
- Added display of statistical mode to find zone menu.
- Automatic stack sampling is now available on windows.
- Properly handle tracing on long-running systems.
- Message list entries can now show associated frame image.
- Call stack window will now display module names.
- Symbol location in call stack window may now also display symbol address.
- Statistics menu can now be used to display call stack sampling data or
  list available symbols.
- All call paths leading to the sampled instruction in a call stack can be
  now displayed.
- Frame image compression ratio (lossless in-memory compression, not taking
  into account DXT compression) is displayed in playback window.
- Allow reconnection straight from the discard data dialog.
- Added ability to set custom names for locks.
- Improved handling of network ports.
- Added time percentage display to instrumentation statistics.
- Display of ghost zones (generated from automated call stack sampling).
- Notify when empty labels display is enabled.
- Small fragments of executable code will be now sent from client to server.
- Added notification about query backlog.
- Fixed performance problem with query backlog.
- Display number of in-flight queries, in addition to query backlog.
- Improved failure reports.
- The capture utility will connect to localhost by default.
- Added optional support for QPC timer on windows.
- Complete rewrite of source file viewer. It is now 100% reliable when going
  to a source location.
- Symbol source view was added.
  - Extension of source file viewer.
  - Can display source file, assembly view, or both at the same time.
  - May include display of statistical profiling data.
  - Ability to switch between source files which were used to build the
    symbol.
  - Ability to switch between inlined functions which are incorporated into
    the symbol.
  - Graphical representation of control flow in program.
  - Display of micro-architectural data for each assembly instruction.
  - Tracking register dependencies between assembly instructions.
  - Disassembly may be saved to a file, in order to be processed by external
    tools.
- If the default listening port is occupied, profiler will now try listening
  on other ports.
- Added possibility to perform source file names substitution.
- Profiler windows can be now docked.
- CPU usage tooltip now displays a list of running threads.
- Added possibility to filter discovered clients list.
- Source files are now cached during capture.
- Profiler will now display a popup when application crashes.
- Added ability to send simple integral values as extra payload for zones.
- Per-frame zone times on the frames plot can now display self time.
- Ability to bind only on localhost interface.
- OpenCL profiling.
- Direct3D 12 profiling.


v0.6.3 (2020-02-13)
-------------------

- Fixed performance issues with loading saved traces on Ryzen CPUs.
- Profiler window contents are now properly updated during window resize.
- Improved tid to pid mapping on windows.
- Zero length and unfinished zones are no longer taken into account for
  statistics.
- Build files for shared library are now available (experimental).
- GPU zones now also have "active" parameter.
- Further reduction of memory usage and on-disk trace size.
- Replaced ska::flat_hash_map with robin-hood-hashing.
- Speed-up rendering of long lists of items.
- Exact event time is displayed in some places in the UI.
- Memory allocation lists can now be sorted.
- Added display of trace file compression ratio.
- Optional Zstd compression of trace files.
- Frame images are now internally compressed using Zstd (instead of LZ4).
- Fix display of continuous frame set tooltips.


v0.6.2 (2019-12-30)
-------------------

- Improved call stack decoding on OSX.
- Collection of CPU topology data.
- C API now supports allocated source locations.
- Added chrome:tracing importer.
- Allow merging of ZoneText() strings.
- Time distribution can now show both exclusive and inclusive times.
- Display proper value of selection time in find zone menu.
- Implemented limiting find zone search to a specified time range.
- Highlight hovered zone from find zone menu zone list on the histogram.
- Allow copying user data directory location to the clipboard.


v0.6.1 (2019-11-28)
-------------------

- Dropped support for pre-v0.5 traces.
- Improve BSD support.
- GPU zone CPU thread highlight will now highlight whole thread, not only
  the thread name.
- Added CPU thread highlight for CPU data items.
- Client parameters may be now set from the server.
- Minor UI fixes.


v0.6 (2019-11-17)
-----------------

This is the last release which will be able to load pre-v0.5 traces. Use the
update utility to convert your old traces now!

- Dropped support for pre-v0.4 traces.
- Major memory usage decrease.
- Significant network bandwidth decrease.
- Implemented context switch capture on selected platforms.
  - Zone timings in various UI places can now take into account only the
    time when the thread was executing.
  - Zone information window can now display regions in which thread was
    suspended by the operating system.
  - CPUs on which the zone was running are enumerated.
  - Thread activity regions can be graphed on the timeline.
- API breakage: SetThreadName() now only works on current thread.
- Fixed thread name retrieval after thread is destroyed.
- Added number of CPU cores to host info.
- Limited number of possible source locations to 64K.
- Limited supported capture length to 1.6 days.
- CPU cores are now displayed on the timeline.
  - Thread execution workload is displayed, including threads from external
    programs.
  - Thread migrations across CPU cores can be graphed.
  - System-wide workload distribution is now plotted on the timeline.
- Added "CPU data" window showing programs competing for CPU during the
  capture.
- Switched to using native thread identifiers (relatively small numbers), as
  opposed to pthreads identifiers, which in reality were pointers.
- Improved thread name discovery if context switch capture is enabled.
- Per-trace state is now preserved between profiling sessions:
  - Timeline view position.
  - Item categories draw/hide settings.
- Timeline zones will be highlighted using a different color, when a
  matching time range is selected on histogram.
- Per-frame zone times are now displayed on the frames plot when a zone is
  selected in the find zone menu.
- Zone color is now displayed in zone information window.
- Zone colors can now be determined basing on depth and thread or source
  location.
- Thread colors are displayed across the profiler application.
- Frame times can be now compared.
- Expose more lock handling functionality.
- Network port can be now specified by the user.
- Proper handling of multithreaded Vulkan code.
- Added extreme compression level in update utility.
- Added time distribution data in the zone information window.
- Trace file name is now displayed in trace information window.
- Annotations can be now added to the timeline.
- Server now performs network data retrieval and decompression on a dedicated
  thread.
- Added examples of Tracy integration.
- Allow grouping of zones in the find zone menu by zone parent or with no
  grouping.
- Zone list in the statistics window can be now filtered.
- Implemented configuration of plots.
- Messages can now collect call stacks.


v0.5 (2019-08-10)
-----------------

This is the last release which will be able to load pre-v0.4 traces. Use the
update utility to convert your old traces now!

- Major decrease of trace dump file size.
- Major optimizations across the board.
- Vcpkg is now used for library management on Windows.
- Display dump file size change in the update utility.
- Added notification area.
  - Display trace loading time.
  - Display background processing tasks after trace is loaded.
  - Display trace save notification.
  - Show crash icon, if there was a crash.
- Added C API.
- Profiling session may now gracefully terminate, due to incorrect
  instrumentation. A popup with termination reason will be displayed.
- Call stack improvements.
  - Call stack frames now have a proper source file and file line
    information on Linux.
  - Single call stack frame may now have multiple entries, representing
    inlined function calls.
  - Call stack grouping in the find zone menu now has a special display
    mode.
  - Call stack memory allocations tree improvements:
    - Add top-down variant to complement the previously available bottom-up
      one.
    - Add ability to group tree nodes by function name.
    - Allow restricting tree to display only active allocations.
  - Added support for Lua call stack capture.
- Self time of zones may be now displayed in the find zone menu.
- Added ability to disconnect from a client.
- Find zone groups can now be sorted by mean time per call.
- Zones displayed in the find zone menu can be now grouped by order of
  appearance, execution time or name.
- Time is now displayed without trailing fractional zeros (e.g. "2.5 ms"
  instead of "2.50 ms").
- Child zones displayed in zone info window can be now grouped by source
  location.
- Selected or hovered lock is now highlighted on the timeline.
- Locks are now grouped into single and multithreaded (contended and
  uncontended) in the options menu locks list.
- On broken platforms the profiler can now be initialized as needed (and
  possible), taking a performance and functionality hit.
- User experience improvements in the graphical profiler.
  - Thread position and height is now animated, to eliminate flickering that
    was happening when depth of displayed zones was changing.
  - Zooming in/out using the mouse wheel is now animated.
  - Plot range adjustment is now animated.
  - Various other UI improvements.
- System CPU usage is now being monitored.
- Threads that have nothing to display in the current view are now hidden by
  default.
- Dimmed-out the timeline outside the profiling area.
- Source file view can now be opened also from statistics menu.
- Display standard deviation in find zone and compare traces menus.
- Display zone messages in zone information window.
- Display order of threads can be changed in the options menu.
- Prevent deadlocks by querying socket send buffer size.
- Frame set statistics can be now limited to frames visible on the screen.
- Messages can be now colored.
- Zone selection in compare traces menu can be now linked to the other
  trace.
- Added support for frame image (screen shot) storage.
- Implemented ability to cut off outliers on histograms.
- Zone or frame that is currently hovered by the mouse cursor will be
  highlighted on the histogram.
- Server now displays available clients in the local network.
- Source code whitespace visibility can now be enabled or disabled.
- Profiler will now check if proper timer readings can be performed on
  x86/x64.
- Application can now log app-specific information, similarly to how the
  host info reports system information.
- Message list will automatically scroll down to the most recent message.
  - Feature will disable when the list is scrolled by user.
  - To re-enable, scroll to the bottom of the list.
- Message list can be now filtered.
- A notification popup will be displayed during trace cleanup.
- Source file view won't be available if a source file is newer than the
  capture.
- Added ability to set custom trace descriptions.
- Added frame time target lines.
- FPS counts are now displayed next to frame times.
- GPU drift value can be now automatically measured.
- Connection window is now a popup hidden under a dedicated button.


v0.4.1 (2018-12-30)
-------------------

- Active frame set can be now switched by clicking on a frame set on the
  timeline.
- Add ability to go to a specified frame.
- Most commonly used addresses can be now selected from the drop-down menu.
- Fixed corner case problem with profiler initialization on Windows.
- Added third state (stopped) to the pause/resume button. It will be used
  after the connection to the client is terminated.
- Active trace can be discarded.
- Call stack capture may be forced through TRACY_CALLSTACK define.
- Lock info window has been added.
- Time of lock creation and termination is now being tracked.
- Menu bar buttons are now toggles that can also close their corresponding
  windows.
- Find zone and compare menu improvements.
  - Ability to ignore case during search.
  - Pressing enter key will now start search, just like pressing the "find"
    button.
  - Using the ^F keyboard shortcut will open the find zone menu and focus
    the input box.
- Added ability to automatically connect to an IP address in the graphical
  profiler application (use "-a address" argument to enable).
- Pressing enter key after entering client address in the welcome dialog
  will now automatically begin connection process.


v0.4 (2018-10-09)
-----------------

- Renamed "standalone" utility to "profiler".
- Added trace update utility, which will convert files saved in previous
  versions of tracy to be up-to-date.
  - Optional high compression (--hc) mode is available that will increase
    the compression level, at the cost of considerably longer compression
    time.
- Fix regression causing varying size of profiler window for different
  captures.
- Added support for on-demand tracing.
  - If a client application is compiled with the TRACY_ON_DEMAND macro
    defined, tracing will not begin until a connection to server is
    established.
  - Since data is not fully captured in this mode, the resulting trace will
    be less precise, until application state is appropriately reset. For
    example, locks need to be fully released, zone stacks need to be
    flushed. This is an automatic process.
  - All tracing macros are able to work in the on-demand mode.
- Improved compatibility with various system setups.
- Aside from using TRACY_NO_EXIT define you can also set the same-named
  environmental variable to 1 to get the same effect.
- Added ability to show/hide all threads and plots.
- Performance improvements.
- Improvements to memory data presentation.
  - Added memory allocation info window.
  - Selecting memory allocation on a plot will draw time range of the
    allocation.
  - Middle clicking on an memory allocation address (or on a button in
    memory allocation info window) will zoom the view to the allocation
    range.
- Find zone menu improvements:
  - Zones can be now also grouped by call stacks.
  - Zone groups can be now also sorted by time spend in each zone.
  - Zone groups list now displays group times.
  - Average and median zone times are now displayed on the histogram.
  - Selected zones will be highlighted on the timeline view.
- Added named versions of tracing macros that allow specifying scoped
  variable name.
- The main profiler window is now kept at the bottom of windows stack.
- The "profiler" utility will now use a custom embedded font.
- Microseconds are now displayed using correct symbol ('μ' instead of 'u').
- Unix builds of the "profiler" utility will now ask for a file name when
  saving a trace.
- Progress popup is now displayed when a trace file is loading.
- Zones that share source location with a zone that is hovered over are now
  highlighted.
- Added ability to zoom-in to a selection range made using middle mouse
  button.
  - Holding the ctrl key will switch to zoom-out mode.
- The "profiler" utility will use less resources when its window is
  out-of-focus or minimized.
- Added support for cross-DLL profiling.
- Items in options menu (locks, threads, etc.) are now described with number
  of events.
  - Source location of lock declaration is also provided.
- Created an extensive user manual for the profiler.
- Added ability to capture multiple frame sets.
  - Viewer will display multiple frame ranges at once.
  - Only one frame set can be active at once. The selected one is used for
    the frame navigation graph, frame navigation buttons and drawing frame
    separators.
  - The active frame set will be highlighted, and the rest will be dimmed
    out.
  - Frames can now also be discontinuous.
- Frames and zones too small to be displayed will be marked with a zig-zag
  pattern.
- General improvements to message list and message markers.
  - Hovering over message on a list will highlight its marker (previously it
    only worked the other way).
  - Left clicking on a message marker will focus the message list on the
    selected message.
  - Middle clicking on a message marker will center it on screen.
- Added trace information window.
  - This includes frame time statistics and histogram.
- Displayed memory sizes are now properly formatted.
- Added call stack tree for memory allocations.
  - You can display allocations list for each call stack tree entry.
- The source code of the profiled application may now be viewed in the
  profiler.
  - BIG FAT WARNING: The actual profiled program source code is not known to
    the profiler. It only checks if there is a file on your disk that
    matches the file name of the captured source location. Even if the file
    is displayed, it may be out of date.
  - CPU and GPU zones will have "Source" button, if source file can be
    opened.
  - Source files for call stack traces can be opened by right-clicking on
    the file name. Since in this case there is no button that can be hidden,
    a small animation will be played to notify user if the source cannot be
    opened.
- The main profiler view will now occupy the whole window. Previous behavior
  is still available for embedded use cases.
- Many button labels are now accompanied by icons.
- Fonts should now be less blurry.
- "Go to parent" button in zone info window won't be displayed if there is
  no parent to go to.
- Improvements to the compare traces menu.
  - There are now colored markers to make it easier to distinguish "this" and
    "external" traces.
  - The amount of saved time is now displayed (a difference between total
    run times of both traces).
- Tracy will now collect host information, like CPU name, amount of system
  memory, etc.
- Windows builds of the "profiler" utility will perform a check of supported
  CPU instruction set and match it against the one required by the binary
  (by default AVX2 is used). If the program cannot be executed on the
  processor, a message dialog with workaround instructions will be
  displayed.
- Tracy can intercept crashes and finish sending data from a dying process.
  - Currently this is only implemented on Windows, Linux and Android.
- Call stack window may now display addresses of the frames, instead of
  source file locations.
- Memory events will now properly register their thread.
- Profiler settings are now stored in a persistent location.
  - On Windows settings are stored in %APPDATA%/tracy.
  - On other platforms settings are stored in $XDG_CONFIG_HOME/tracy or
    $HOME/.config/tracy, if the variable is not set.
  - The main profiler window position, size and maximized state are saved
    and restored.
  - The size and position of internal windows now doesn't depend on the
    runtime directory of the profiler executable.
- Added connection handshake.
  - Server won't be able to connect to client if there's a protocol version
    mismatch.
  - Client not in on-demand mode will refuse connections after the first
    connection was made and the initial event buffers were cleared.
- A single server will no longer try to connect to multiple clients.
- The capture utility will now display time span of the ongoing capture.


v0.3 (2018-07-03)
-----------------

- Breaking change: the format of trace files has changed.
  - Previous tracy version will crash when trying to open new traces.
  - Loading of traces saved by previous version is supported.
  - Tracy will no longer crash when trying to load traces saved by future
    versions. Instead, a dialog advising to update will be displayed.
  - Tracy will no longer crash in most cases when trying to open files that
    are not traces. Some crashes are still possible, due to support of old,
    header-less traces.
- Ability to track every memory allocation in profiled program.
  - Allocation event queuing must be done in order, which requires exclusive
    access to the serialized queue on the client side. This has no effect on
    the rest of events, which are stored in a concurrent queue, as before.
  - You can search for a memory address and see where it was allocated, for
    how long, etc. This lists all matching allocations since the program was
    started.
  - All active (non-freed) allocations may be listed. This shows the current
    memory state by default, but can go back to any point in time.
  - Graphical representation of process memory map may be displayed. New
    allocations/frees are displayed in a bright color and fade out with
    time. This feature also can look back in time.
  - Memory usage plot is automatically generated.
  - Basic allocation information is displayed in memory plot tooltips.
  - A summary of memory events within a zone (and its children) is now
    printed in zone info window.
- Support loading profile dumps with no memory allocation data (generated by
  v0.2).
- Added ability to display global statistics of a selected zone from the
  zone info window.
- Fixed regression with lock announce processing that appeared during
  worker/viewer split.
- Allow selecting/unselecting all locks for display.
- Performance improvements.
- Don't save unneeded lock information in trace file.
- Don't save thrash in message list data.
- Allow expanding view span up to one hour, instead of one minute.
- Added trace comparison window.
  - An external trace has to be loaded first.
  - Zone query in both traces (current and external).
  - Both results are overlaid on the same histogram.
  - Graphs can be adjusted as-if there was the same number of zones
    collected.
- Read time directly from a hardware register on ARM/ARM64, if possible.
  - User-space access to the timer needs to be enabled in the kernel, so
    tracy will perform run-time checks and fallback to the old method if the
    check fails.
- Prevent connections in a TIME-WAIT state from blocking new listen
  connections.
- Display y-range of plots.
- Added ability to unload traces loaded from files. To do so close the main
  profiler window. You will return to the connect/open selection dialog.
  Live captures cannot be terminated this way.
- Zones previously displayed in zone info window are remembered and you can
  go back to them. Closing the zone info window or switching between CPU and
  GPU zones will clear the memory.
- Improved message list window.
  - Messages are now displayed in columns.
  - Originating thread of each message is now included in the list.
  - Messages can be filtered by the originating thread.
- You can now navigate to next and previous frame.
- Zone statistics can be now displayed using only self times.
- Support for tracing GPU events using Vulkan.
- Timeline will now display "OpenGL context" or "Vulkan context" instead of
  "GPU context".
- Fixed regression causing invalid display of GPU context appearance time.
- Fixed regression causing invalid reporting of an active CPU in zone end
  events, if MSVC rdtscp optimization was not enabled.
- Ability to collect true call stacks.
  - Supported on Windows, Linux, Android.
  - The following events can collect call stacks:
    - Memory alloc/free.
    - Zone begin.
    - GPU zone begin.
  - Zone stack trace now also displays frames from a real call trace.
  - On Linux call stack frame name resolution requires a call to dladdr,
    which in turn requires linking with libdl.
- Allow manual entry of GPU time drift value.
- Unix build system no longer shares object files between different build
  units.
  - Fixes inability to build debug and release versions of a single utility
    without "make clean".
  - Fixes incompatibility between "standalone" and "capture" utilities due
    to different set of used feature flags.
- On Windows "standalone" utility now adapts to system DPI setting.
- Optional per-call zone naming.


v0.2 (2018-04-05)
-----------------

- Fixed broken TRACY_NO_EXIT behavior.
- Visual refresh (new color scheme).
- Added optional support for live in-depth zone analysis.
  - Ability to search for zones matching a query.
  - Histogram of zone time spans.
  - List occurrences of a zone, grouped by thread, or by user text.
  - Zone groups can be selected and highlighted on histogram graph.
  - Support for linear and logarithmic display of time and values.
  - Histogram bins can show zone counts or total execution time.
  - Listed zones can be narrowed down by data range selection on histogram.
- Separation of server data handling code from the visualisation.
- Implementation of a command line capture utility.
- Support libraries have been updated.
- Fixed an issue that prevented de-duplication of source location payloads.
- Fixed an issue that prevented the ability to disable threads in settings
  menu, if two threads had the same name.
- Performance optimizations.
- Visual clean up of the settings menu.
- Zone info windows improvements.
  - Visual improvements to zone info window child list.
  - Zone info windows now show zone thread.
  - Display zone stack trace.
- Hide pause/resume button if there's no data connection (i.e. trace was
  loaded from file).
- Source location statistics view has been added.
- Fixed crash when a saved trace was opened, but no trace capture session
  was performed before.
- Standalone server will now open trace files passed as an argument to the
  executable.
- Fix possible crash in SetThreadName, that could happen if TLS init was
  delayed until first use of thread local variable.
- Store full thread name if pthreads (with 15 character name limit) are
  used.
- Properly handle unaligned memory access (no performance impact).
- Fixed broken lock identifiers in try_lock().


v0.1 (2017-12-18)
-----------------

- Initial release.