9439fa1078
Currently, due to an oversight, we only balance work buffers in background and idle workers and not in assists. As a result, in assist-heavy workloads, assists are likely to tie up large work buffers in per-P caches increasing the likelihood that the global list will be empty. This increases the likelihood that other GC workers will exit and assists will block, slowing down the system as a whole. Fix this by eagerly balancing work buffers as soon as the assists notice that the global buffers are empty. This makes it much more likely that work will be immediately available to other workers and assists. This change reduces the garbage benchmark time by 39% and fixes the regresssion seen at CL 15893 golang.org/cl/15893. Garbage benchmark times before and after this CL. Before GOPERF-METRIC:time=4427020 After GOPERF-METRIC:time=2721645 Fixes #13827 Change-Id: I9cb531fb873bab4b69ce9c1617e30df6c49cdcfe Reviewed-on: https://go-review.googlesource.com/18341 Reviewed-by: Austin Clements <austin@google.com> |
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The Go Programming Language
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