e50913cefc
During the GC mark phase, one of the first behaviors of findRunnable is to check if it should execute a GC mark worker. Mark workers often run for many milliseconds in a row, so programs that invoke the scheduler more frequently will see that condition trigger only a tiny fraction of the time. Obtaining a mark worker from the gcBgMarkWorkerPool involves a CAS on a single memory location that's shared across the process. When GOMAXPROCS is large, the resulting contention can waste a significant amount of CPU time. But a sufficiently large GOMAXPROCS also means there's no need for fractional mark workers, making it easier to check ahead of time if we need to run a worker. Check, without committing to a particular worker, whether we would even want to run one. For #68399 Change-Id: I5d8578c2101ee20a8a4156a029584356095ea118 Reviewed-on: https://go-review.googlesource.com/c/go/+/602477 Reviewed-by: Michael Pratt <mpratt@google.com> Auto-Submit: Rhys Hiltner <rhys.hiltner@gmail.com> Reviewed-by: Michael Knyszek <mknyszek@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> |
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The Go Programming Language
Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.
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