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| author | Russ Cox <rsc@golang.org> | 2011-07-19 11:01:17 -0400 |
|---|---|---|
| committer | Russ Cox <rsc@golang.org> | 2011-07-19 11:01:17 -0400 |
| commit | 025abd530e2c5a010b295efbcbcef94aff0cd396 (patch) | |
| tree | aae8236f32731d731ea8dac9687c9761147e95d0 /src/pkg/runtime/export_test.go | |
| parent | 9f636598ba2425cbc31e416599f430829fa36b20 (diff) | |
| download | go-025abd530e2c5a010b295efbcbcef94aff0cd396.tar.xz | |
runtime: faster entersyscall, exitsyscall
Uses atomic memory accesses to avoid the need to acquire
and release schedlock on fast paths.
benchmark old ns/op new ns/op delta
runtime_test.BenchmarkSyscall 73 31 -56.63%
runtime_test.BenchmarkSyscall-2 538 74 -86.23%
runtime_test.BenchmarkSyscall-3 508 103 -79.72%
runtime_test.BenchmarkSyscall-4 721 97 -86.52%
runtime_test.BenchmarkSyscallWork 920 873 -5.11%
runtime_test.BenchmarkSyscallWork-2 516 481 -6.78%
runtime_test.BenchmarkSyscallWork-3 550 343 -37.64%
runtime_test.BenchmarkSyscallWork-4 632 263 -58.39%
(Intel Core i7 L640 2.13 GHz-based Lenovo X201s)
Reduced a less artificial server benchmark
from 11.5r 12.0u 8.0s to 8.3r 9.1u 1.0s.
R=dvyukov, r, bradfitz, r, iant, iant
CC=golang-dev
https://golang.org/cl/4723042
Diffstat (limited to 'src/pkg/runtime/export_test.go')
| -rw-r--r-- | src/pkg/runtime/export_test.go | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/pkg/runtime/export_test.go b/src/pkg/runtime/export_test.go index 58631c7b4b..53c5fcba47 100644 --- a/src/pkg/runtime/export_test.go +++ b/src/pkg/runtime/export_test.go @@ -15,3 +15,9 @@ var F32to64 = f32to64 var Fcmp64 = fcmp64 var Fintto64 = fintto64 var F64toint = f64toint + +func entersyscall() +func exitsyscall() + +var Entersyscall = entersyscall +var Exitsyscall = exitsyscall |