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302474c61c
The default value of runtime.MemProfileRate is non-zero, which means that a small portion of allocations go through the (slow) profiled allocation path. This is never useful in the compiler unless the -memprofile flag has been passed. I noticed this when samples from mprof.go showed up in a compiler cpu pprof listing. name old time/op new time/op delta Template 207ms ± 4% 205ms ± 4% -0.86% (p=0.001 n=97+90) Unicode 91.8ms ± 4% 91.4ms ± 4% -0.44% (p=0.030 n=93+93) GoTypes 628ms ± 4% 624ms ± 3% -0.73% (p=0.001 n=95+92) Compiler 2.70s ± 3% 2.69s ± 3% -0.39% (p=0.000 n=97+95) Flate 131ms ± 5% 130ms ± 4% -0.82% (p=0.000 n=93+90) GoParser 154ms ± 5% 153ms ± 4% -0.57% (p=0.019 n=98+96) Reflect 394ms ± 5% 392ms ± 5% -0.62% (p=0.026 n=94+97) Tar 112ms ± 6% 112ms ± 5% ~ (p=0.455 n=97+98) XML 214ms ± 3% 213ms ± 4% -0.68% (p=0.000 n=91+93) name old user-ns/op new user-ns/op delta Template 246user-ms ± 3% 244user-ms ± 4% -0.48% (p=0.016 n=92+91) Unicode 114user-ms ± 5% 113user-ms ± 4% -0.78% (p=0.002 n=98+94) GoTypes 817user-ms ± 3% 813user-ms ± 2% -0.50% (p=0.006 n=96+94) Compiler 3.58user-s ± 2% 3.57user-s ± 2% -0.38% (p=0.003 n=97+95) Flate 158user-ms ± 5% 157user-ms ± 4% -0.80% (p=0.000 n=94+90) GoParser 191user-ms ± 4% 191user-ms ± 4% ~ (p=0.122 n=98+98) Reflect 500user-ms ± 4% 498user-ms ± 4% ~ (p=0.057 n=95+99) Tar 134user-ms ± 3% 134user-ms ± 4% ~ (p=0.529 n=98+98) XML 265user-ms ± 3% 265user-ms ± 3% -0.30% (p=0.033 n=92+96) Change-Id: Ied5384e337800d567895ff8d47f15d631edf4f0b Reviewed-on: https://go-review.googlesource.com/35916 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
77 lines
1.6 KiB
Go
77 lines
1.6 KiB
Go
// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package gc
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import (
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"os"
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"runtime"
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"runtime/pprof"
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)
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func (n *Node) Line() string {
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return linestr(n.Pos)
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}
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var atExitFuncs []func()
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func atExit(f func()) {
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atExitFuncs = append(atExitFuncs, f)
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}
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func Exit(code int) {
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for i := len(atExitFuncs) - 1; i >= 0; i-- {
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f := atExitFuncs[i]
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atExitFuncs = atExitFuncs[:i]
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f()
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}
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os.Exit(code)
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}
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var (
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cpuprofile string
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memprofile string
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memprofilerate int64
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traceprofile string
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traceHandler func(string)
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)
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func startProfile() {
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if cpuprofile != "" {
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f, err := os.Create(cpuprofile)
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if err != nil {
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Fatalf("%v", err)
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}
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if err := pprof.StartCPUProfile(f); err != nil {
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Fatalf("%v", err)
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}
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atExit(pprof.StopCPUProfile)
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}
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if memprofile != "" {
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if memprofilerate != 0 {
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runtime.MemProfileRate = int(memprofilerate)
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}
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f, err := os.Create(memprofile)
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if err != nil {
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Fatalf("%v", err)
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}
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atExit(func() {
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// Profile all outstanding allocations.
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runtime.GC()
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// compilebench parses the memory profile to extract memstats,
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// which are only written in the legacy pprof format.
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// See golang.org/issue/18641 and runtime/pprof/pprof.go:writeHeap.
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const writeLegacyFormat = 1
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if err := pprof.Lookup("heap").WriteTo(f, writeLegacyFormat); err != nil {
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Fatalf("%v", err)
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}
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})
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} else {
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// Not doing memory profiling; disable it entirely.
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runtime.MemProfileRate = 0
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}
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if traceprofile != "" && traceHandler != nil {
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traceHandler(traceprofile)
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}
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}
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