Commit dcd62fc41c3baede1eee0cf243be73a0f4fb293a
2023-08-31T15:35:39
Trace perf: clear blob cache before each test Cache eviction can happen during warmup causing cache misses while testing. Significant cycles are being spent evicting cache entries and throwing off power measurement. Since this is already a synthetic environment where we're lumping in a bunch of caches together, clear it between tests so that warmup correctly populates and no cache misses occur within the test run. If we clear the cache before warmup and everything fits, no eviction happens and we hit the cache every time post-warmup. This also improves reproducibility of perf results as they no longer depend on the specific cache state before running a particular test, the order in which tests are run etc. Also fixes acessing unset var when running without --power. Bug: b/298028816 Change-Id: I704073f70d8859e19a78b23d397e68f5836f3bb2 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4834073 Reviewed-by: Cody Northrop <cnorthrop@google.com> Commit-Queue: Roman Lavrov <romanl@google.com>