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| author | Shenghou Ma <minux.ma@gmail.com> | 2012-12-18 22:57:25 +0800 |
|---|---|---|
| committer | Shenghou Ma <minux.ma@gmail.com> | 2012-12-18 22:57:25 +0800 |
| commit | 7777bac6e4570ffe485f736e79f0631a460171f4 (patch) | |
| tree | cb2fc50b5982cf329e3cbf6fef0501f0fa77dcc5 /src/pkg/runtime/sys_linux_386.s | |
| parent | 5b46fc417fdc908fd41d1e88a909d8e92a29504c (diff) | |
| download | go-7777bac6e4570ffe485f736e79f0631a460171f4.tar.xz | |
runtime: use clock_gettime to get ns resolution for time.now & runtime.nanotime
For Linux/{386,arm}, FreeBSD/{386,amd64,arm}, NetBSD/{386,amd64}, OpenBSD/{386,amd64}.
Note: our Darwin implementation already has ns resolution.
Linux/386 (Core i7-2600 @ 3.40GHz, kernel 3.5.2-gentoo)
benchmark old ns/op new ns/op delta
BenchmarkNow 110 118 +7.27%
Linux/ARM (ARM Cortex-A8 @ 800MHz, kernel 2.6.32.28 android)
benchmark old ns/op new ns/op delta
BenchmarkNow 625 542 -13.28%
Linux/ARM (ARM Cortex-A9 @ 1GHz, Pandaboard)
benchmark old ns/op new ns/op delta
BenchmarkNow 992 909 -8.37%
FreeBSD 9-REL-p1/amd64 (Dell R610 Server with Xeon X5650 @ 2.67GHz)
benchmark old ns/op new ns/op delta
BenchmarkNow 699 695 -0.57%
FreeBSD 9-REL-p1/amd64 (Atom D525 @ 1.80GHz)
benchmark old ns/op new ns/op delta
BenchmarkNow 1553 1658 +6.76%
OpenBSD/amd64 (Dell E6410 with i5 CPU M 540 @ 2.53GHz)
benchmark old ns/op new ns/op delta
BenchmarkNow 1262 1236 -2.06%
OpenBSD/i386 (Asus eeePC 701 with Intel Celeron M 900MHz - locked to 631MHz)
benchmark old ns/op new ns/op delta
BenchmarkNow 5089 5043 -0.90%
NetBSD/i386 (VMware VM with Core i5 CPU @ 2.7GHz)
benchmark old ns/op new ns/op delta
BenchmarkNow 277 278 +0.36%
NetBSD/amd64 (VMware VM with Core i5 CPU @ 2.7Ghz)
benchmark old ns/op new ns/op delta
BenchmarkNow 103 105 +1.94%
Thanks Maxim Khitrov, Joel Sing, and Dave Cheney for providing benchmark data.
R=jsing, dave, rsc
CC=golang-dev
https://golang.org/cl/6820120
Diffstat (limited to 'src/pkg/runtime/sys_linux_386.s')
| -rw-r--r-- | src/pkg/runtime/sys_linux_386.s | 24 |
1 files changed, 11 insertions, 13 deletions
diff --git a/src/pkg/runtime/sys_linux_386.s b/src/pkg/runtime/sys_linux_386.s index 28ae37b8d9..b212f806c1 100644 --- a/src/pkg/runtime/sys_linux_386.s +++ b/src/pkg/runtime/sys_linux_386.s @@ -104,40 +104,38 @@ TEXT runtime·mincore(SB),7,$0-24 // func now() (sec int64, nsec int32) TEXT time·now(SB), 7, $32 - MOVL $78, AX // syscall - gettimeofday - LEAL 8(SP), BX - MOVL $0, CX + MOVL $265, AX // syscall - clock_gettime + MOVL $0, BX + LEAL 8(SP), CX MOVL $0, DX CALL *runtime·_vdso(SB) MOVL 8(SP), AX // sec - MOVL 12(SP), BX // usec + MOVL 12(SP), BX // nsec - // sec is in AX, usec in BX + // sec is in AX, nsec in BX MOVL AX, sec+0(FP) MOVL $0, sec+4(FP) - IMULL $1000, BX MOVL BX, nsec+8(FP) RET // int64 nanotime(void) so really // void nanotime(int64 *nsec) TEXT runtime·nanotime(SB), 7, $32 - MOVL $78, AX // syscall - gettimeofday - LEAL 8(SP), BX - MOVL $0, CX + MOVL $265, AX // syscall - clock_gettime + MOVL $0, BX + LEAL 8(SP), CX MOVL $0, DX CALL *runtime·_vdso(SB) MOVL 8(SP), AX // sec - MOVL 12(SP), BX // usec + MOVL 12(SP), BX // nsec - // sec is in AX, usec in BX + // sec is in AX, nsec in BX // convert to DX:AX nsec MOVL $1000000000, CX MULL CX - IMULL $1000, BX ADDL BX, AX ADCL $0, DX - + MOVL ret+0(FP), DI MOVL AX, 0(DI) MOVL DX, 4(DI) |