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.

Note: Release numbers are nothing more than numbers. There are some
"missing" versions due to trace file changes during development. This is not
a mistake.

v0.6 (xxxx-xx-xx)
-----------------

- Dropped support for pre-v0.4 traces.
- 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.
- 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.
- Added "CPU data" window (accessible from the trace info 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 thread and depth.
- Frame times can be now compared.
- Expose more lock handling functionality.
- Network port can be now specified by the user.

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.


v0.3.3 (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.