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a841300384
Signed-off-by: Danylo Piliaiev <dpiliaiev@igalia.com> Reviewed-by: Emma Anholt <emma@anholt.net> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16781>
63 lines
2.0 KiB
ReStructuredText
63 lines
2.0 KiB
ReStructuredText
u_trace GPU Performance Tracing
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===============================
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Mesa has its own GPU performance tracing framework which drivers may
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choose to implement. ``gpu.renderstages.*`` producer for
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:doc:`Perfetto Tracing <perfetto>` is based on u_trace.
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It doesn't require external dependencies and much simpler to use. Though
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it provides information only about GPU timings and is harder to analyze
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for complex rendering.
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u_trace is useful when one needs to quickly identify performance bottleneck,
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or to build a tool to analyze the raw performance data.
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Drivers which support u_trace:
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- Intel drivers: Anv, Iris
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- Adreno drivers: Freedreno, Turnip
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Usage
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-----
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u_trace is controlled by environment variables:
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:envvar:`GPU_TRACE`
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if set to ``1`` enables tracing and outputs the data into ``stdout``
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:envvar:`GPU_TRACEFILE`
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specifies a file where to write the output instead of ``stdout``
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:envvar:`GPU_TRACE_FORMAT`
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controls a format of the output
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``txt``
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human readable text format
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``json``
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json format, suitable for parsing. Application should appropriately
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finish its rendering in order for trace's json to be valid.
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For Vulkan api it is expected to destroy the device, for GL it is
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expected to destroy the context.
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:envvar:`GPU_TRACE_INSTRUMENT`
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Meaningful only for Perfetto tracing. If set to ``1`` enables
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instrumentation of GPU commands before the tracing is enabled.
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:envvar:`*_GPU_TRACEPOINT`
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tracepoints can be enabled or disabled using driver specific environment
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variable. Most tracepoints are enabled by default. For instance
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``TU_GPU_TRACEPOINT=-blit,+render_pass`` will disable the
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``blit`` tracepoints and enable the ``render_pass`` tracepoints.
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.. list-table::
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:header-rows: 1
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* - Driver
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- Environment Variable
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- Tracepoint Definitions
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* - Freedreno
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- :envvar:`FD_GPU_TRACEPOINT`
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- ``src/gallium/drivers/freedreno/freedreno_tracepoints.py``
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* - Turnip
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- :envvar:`TU_GPU_TRACEPOINT`
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- ``src/freedreno/vulkan/tu_tracepoints.py``
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