| # Dawn Perf Tests |
| |
| ## Tests |
| |
| **BufferUploadPerf** |
| |
| Tests repetitively uploading data to the GPU using either `SetSubData` or `CreateBufferMapped`. |
| |
| ## Test Harness |
| The test harness provides a `DawnPerfTestBase` which Derived tests should inherit from. |
| The harness calls `Step()` of a Derived class to measure its execution |
| time. First, a calibration step is run which determines the number of times |
| to call `Step()` to last approximately `kCalibrationRunTimeSeconds`. Then, |
| `Step()` is called for the computed number of times, or until |
| `kMaximumRunTimeSeconds` is exceeded. `kNumTrials` are performed and the |
| results and averages per iteration\* are printed. |
| (See `DawnPerfTest.h` for the values of the constants). |
| |
| The results are printed according to the format specified at |
| [[chromium]//build/scripts/slave/performance_log_processor.py](https://cs.chromium.org/chromium/build/scripts/slave/performance_log_processor.py) |
| |
| \*The number of iterations a test performs should be passed to the |
| constructor of `DawnPerfTestBase`. The reported times are the total time |
| divided by `numSteps * iterationsPerStep`. |
