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Profiling
=========
OpenSWR contains built-in profiling which can be enabled
at build time to provide insight into performance tuning.
To enable this, uncomment the following line in ``rasterizer/core/knobs.h`` and rebuild: ::
//#define KNOB_ENABLE_RDTSC
Running an application will result in a ``rdtsc.txt`` file being
created in current working directory. This file contains profile
information captured between the ``KNOB_BUCKETS_START_FRAME`` and
``KNOB_BUCKETS_END_FRAME`` (see knobs section).
The resulting file will contain sections for each thread with a
hierarchical breakdown of the time spent in the various operations.
For example: ::
Thread 0 (API)
%Tot %Par Cycles CPE NumEvent CPE2 NumEvent2 Bucket
0.00 0.00 28370 2837 10 0 0 APIClearRenderTarget
0.00 41.23 11698 1169 10 0 0 |-> APIDrawWakeAllThreads
0.00 18.34 5202 520 10 0 0 |-> APIGetDrawContext
98.72 98.72 12413773688 29957 414380 0 0 APIDraw
0.36 0.36 44689364 107 414380 0 0 |-> APIDrawWakeAllThreads
96.36 97.62 12117951562 9747 1243140 0 0 |-> APIGetDrawContext
0.00 0.00 19904 995 20 0 0 APIStoreTiles
0.00 7.88 1568 78 20 0 0 |-> APIDrawWakeAllThreads
0.00 25.28 5032 251 20 0 0 |-> APIGetDrawContext
1.28 1.28 161344902 64 2486370 0 0 APIGetDrawContext
0.00 0.00 50368 2518 20 0 0 APISync
0.00 2.70 1360 68 20 0 0 |-> APIDrawWakeAllThreads
0.00 65.27 32876 1643 20 0 0 |-> APIGetDrawContext
Thread 1 (WORKER)
%Tot %Par Cycles CPE NumEvent CPE2 NumEvent2 Bucket
83.92 83.92 13198987522 96411 136902 0 0 FEProcessDraw
24.91 29.69 3918184840 167 23410158 0 0 |-> FEFetchShader
11.17 13.31 1756972646 75 23410158 0 0 |-> FEVertexShader
8.89 10.59 1397902996 59 23410161 0 0 |-> FEPAAssemble
19.06 22.71 2997794710 384 7803387 0 0 |-> FEClipTriangles
11.67 61.21 1834958176 235 7803387 0 0 |-> FEBinTriangles
0.00 0.00 0 0 187258 0 0 |-> FECullZeroAreaAndBackface
0.00 0.00 0 0 60051033 0 0 |-> FECullBetweenCenters
0.11 0.11 17217556 2869592 6 0 0 FEProcessStoreTiles
15.97 15.97 2511392576 73665 34092 0 0 WorkerWorkOnFifoBE
14.04 87.95 2208687340 9187 240408 0 0 |-> WorkerFoundWork
0.06 0.43 9390536 13263 708 0 0 |-> BELoadTiles
0.00 0.01 293020 182 1609 0 0 |-> BEClear
12.63 89.94 1986508990 949 2093014 0 0 |-> BERasterizeTriangle
2.37 18.75 372374596 177 2093014 0 0 |-> BETriangleSetup
0.42 3.35 66539016 31 2093014 0 0 |-> BEStepSetup
0.00 0.00 0 0 21766 0 0 |-> BETrivialReject
1.05 8.33 165410662 79 2071248 0 0 |-> BERasterizePartial
6.06 48.02 953847796 1260 756783 0 0 |-> BEPixelBackend
0.20 3.30 31521202 41 756783 0 0 |-> BESetup
0.16 2.69 25624304 33 756783 0 0 |-> BEBarycentric
0.18 2.92 27884986 36 756783 0 0 |-> BEEarlyDepthTest
0.19 3.20 30564174 41 744058 0 0 |-> BEPixelShader
0.26 4.30 41058646 55 744058 0 0 |-> BEOutputMerger
1.27 20.94 199750822 32 6054264 0 0 |-> BEEndTile
0.33 2.34 51758160 23687 2185 0 0 |-> BEStoreTiles
0.20 60.22 31169500 28807 1082 0 0 |-> B8G8R8A8_UNORM
0.00 0.00 302752 302752 1 0 0 WorkerWaitForThreadEvent
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