bdc5533f39
With the Garbage collector (GC), we observed a false-sharing between work.full and work.empty. (referenced most from runtime.gcDrain and runtime.getempty) This false-sharing becomes worse and impact performance on multi core system. On Intel Xeon 8480+ and default GC setting(GC=100), we can observed top HITM>4% (by perf c2c)caused by it. After resolveed this false-sharing issue, we can get performance 8%~9.7% improved. Verify workloads: DeathStarBench/hotelReservation: 9.7% of RPS improved https://github.com/delimitrou/DeathStarBench/tree/master/hotelReservation gRPC-go/benchmark: 8% of RPS improved https://github.com/grpc/grpc-go/tree/master/benchmark gRPC-go/benchmark 9 iterations' data with master branch: master w/ fs opt. 208862.4 246390.9 221680.0 266019.3 223886.9 248789.7 212169.3 257837.8 219922.4 234331.8 197401.7 261627.7 214562.4 255429.7 214328.5 237087.8 229443.2 230591.3 max 229443.2 266019.3 116% med 214562.4 248789.7 116% avg 215806.3 248678.5 115% Change-Id: Ib386de021cd2dbb802a107f487556d848ba9212d Reviewed-on: https://go-review.googlesource.com/c/go/+/496915 Reviewed-by: Keith Randall <khr@golang.org> Reviewed-by: Michael Knyszek <mknyszek@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> Auto-Submit: Keith Randall <khr@golang.org> Reviewed-by: Keith Randall <khr@google.com> Run-TryBot: Keith Randall <khr@golang.org> |
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