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| author | Dmitriy Vyukov <dvyukov@google.com> | 2011-07-12 09:24:32 -0700 |
|---|---|---|
| committer | Russ Cox <rsc@golang.org> | 2011-07-12 09:24:32 -0700 |
| commit | c9152a8568fd49b2e7a5dd689005098487a6178d (patch) | |
| tree | 8a964f4944586a6ea83885bcfecefb055eedbfd4 /src/pkg/runtime/stack.h | |
| parent | daaf29cf9320011af9b5feee36f75cb2ac175718 (diff) | |
| download | go-c9152a8568fd49b2e7a5dd689005098487a6178d.tar.xz | |
runtime: eliminate contention during stack allocation
Standard-sized stack frames use plain malloc/free
instead of centralized lock-protected FixAlloc.
Benchmark results on HP Z600 (2 x Xeon E5620, 8 HT cores, 2.40GHz)
are as follows:
benchmark old ns/op new ns/op delta
BenchmarkStackGrowth 1045.00 949.00 -9.19%
BenchmarkStackGrowth-2 3450.00 800.00 -76.81%
BenchmarkStackGrowth-4 5076.00 513.00 -89.89%
BenchmarkStackGrowth-8 7805.00 471.00 -93.97%
BenchmarkStackGrowth-16 11751.00 321.00 -97.27%
R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4657091
Diffstat (limited to 'src/pkg/runtime/stack.h')
| -rw-r--r-- | src/pkg/runtime/stack.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/src/pkg/runtime/stack.h b/src/pkg/runtime/stack.h index 2b6b0e3876..cf35365366 100644 --- a/src/pkg/runtime/stack.h +++ b/src/pkg/runtime/stack.h @@ -71,6 +71,7 @@ enum { // If the amount needed for the splitting frame + StackExtra // is less than this number, the stack will have this size instead. StackMin = 4096, + FixedStack = StackMin, // Functions that need frames bigger than this call morestack // unconditionally. That is, on entry to a function it is assumed |