017478a963
This change fixes a possible race with updating metrics and reading them. The update is intended to be protected by the world being stopped, but here, it clearly isn't. Fixing this lets us lower the thresholds in the metrics tests by an order of magnitude, because the only thing we have to worry about now is floating point error (the tests were previously written assuming the floating point error was much higher than it actually was; that turns out not to be the case, and this bug was the problem instead). However, this still isn't that tight of a bound; we still want to catch any and all problems of exactness. For this purpose, this CL adds a test to check the source-of-truth (in uint64 nanoseconds) that ensures the totals exactly match. This means we unfortunately have to take another time measurement, but for now let's prioritize correctness. A few additional nanoseconds of STW time won't be terribly noticable. Fixes #66212. Change-Id: Id02c66e8a43c13b1f70e9b268b8a84cc72293bfd Reviewed-on: https://go-review.googlesource.com/c/go/+/570257 Auto-Submit: Michael Knyszek <mknyszek@google.com> Reviewed-by: Nicolas Hillegeer <aktau@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> |
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