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go/src/runtime/pprof/mprof_test.go
Russ Cox cbab65fdfa runtime/pprof: add streaming protobuf encoder
The existing code builds a full profile in memory.
Then it translates that profile into a data structure (in memory).
Then it marshals that data structure into a protocol buffer (in memory).
Then it gzips that marshaled form into the underlying writer.
So there are three copies of the full profile data in memory
at the same time before we're done. This is obviously dumb.

This CL implements a fully streaming conversion from
the original in-memory profile to the underlying writer.
There is now only one copy of the profile in memory.

For the non-CPU profiles, this is optimal, since we have to
have a full copy in memory to start with.

For the CPU profiles, we could still try to bound the profile
size stored in memory and stream fragments out during
the actual profiling, as Go 1.7 did (with a simpler format),
but so far that hasn't been necessary.

Change-Id: Ic36141021857791bf0cd1fce84178fb5e744b989
Reviewed-on: https://go-review.googlesource.com/37164
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Michael Matloob <matloob@golang.org>
2017-02-24 20:15:56 +00:00

113 lines
3.1 KiB
Go

// Copyright 2014 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package pprof
import (
"bytes"
"fmt"
"reflect"
"regexp"
"runtime"
"testing"
"unsafe"
)
var memSink interface{}
func allocateTransient1M() {
for i := 0; i < 1024; i++ {
memSink = &struct{ x [1024]byte }{}
}
}
//go:noinline
func allocateTransient2M() {
memSink = make([]byte, 2<<20)
}
type Obj32 struct {
link *Obj32
pad [32 - unsafe.Sizeof(uintptr(0))]byte
}
var persistentMemSink *Obj32
func allocatePersistent1K() {
for i := 0; i < 32; i++ {
// Can't use slice because that will introduce implicit allocations.
obj := &Obj32{link: persistentMemSink}
persistentMemSink = obj
}
}
// Allocate transient memory using reflect.Call.
func allocateReflectTransient() {
memSink = make([]byte, 2<<20)
}
func allocateReflect() {
rv := reflect.ValueOf(allocateReflectTransient)
rv.Call(nil)
}
var memoryProfilerRun = 0
func TestMemoryProfiler(t *testing.T) {
// Disable sampling, otherwise it's difficult to assert anything.
oldRate := runtime.MemProfileRate
runtime.MemProfileRate = 1
defer func() {
runtime.MemProfileRate = oldRate
}()
// Allocate a meg to ensure that mcache.next_sample is updated to 1.
for i := 0; i < 1024; i++ {
memSink = make([]byte, 1024)
}
// Do the interesting allocations.
allocateTransient1M()
allocateTransient2M()
allocatePersistent1K()
allocateReflect()
memSink = nil
runtime.GC() // materialize stats
var buf bytes.Buffer
if err := Lookup("heap").WriteTo(&buf, 1); err != nil {
t.Fatalf("failed to write heap profile: %v", err)
}
memoryProfilerRun++
tests := []string{
fmt.Sprintf(`%v: %v \[%v: %v\] @ 0x[0-9,a-f]+ 0x[0-9,a-f]+ 0x[0-9,a-f]+ 0x[0-9,a-f]+
# 0x[0-9,a-f]+ runtime/pprof\.allocatePersistent1K\+0x[0-9,a-f]+ .*/runtime/pprof/mprof_test\.go:40
# 0x[0-9,a-f]+ runtime/pprof\.TestMemoryProfiler\+0x[0-9,a-f]+ .*/runtime/pprof/mprof_test\.go:74
`, 32*memoryProfilerRun, 1024*memoryProfilerRun, 32*memoryProfilerRun, 1024*memoryProfilerRun),
fmt.Sprintf(`0: 0 \[%v: %v\] @ 0x[0-9,a-f]+ 0x[0-9,a-f]+ 0x[0-9,a-f]+ 0x[0-9,a-f]+
# 0x[0-9,a-f]+ runtime/pprof\.allocateTransient1M\+0x[0-9,a-f]+ .*/runtime/pprof/mprof_test.go:21
# 0x[0-9,a-f]+ runtime/pprof\.TestMemoryProfiler\+0x[0-9,a-f]+ .*/runtime/pprof/mprof_test.go:72
`, (1<<10)*memoryProfilerRun, (1<<20)*memoryProfilerRun),
fmt.Sprintf(`0: 0 \[%v: %v\] @ 0x[0-9,a-f]+ 0x[0-9,a-f]+ 0x[0-9,a-f]+ 0x[0-9,a-f]+
# 0x[0-9,a-f]+ runtime/pprof\.allocateTransient2M\+0x[0-9,a-f]+ .*/runtime/pprof/mprof_test.go:27
# 0x[0-9,a-f]+ runtime/pprof\.TestMemoryProfiler\+0x[0-9,a-f]+ .*/runtime/pprof/mprof_test.go:73
`, memoryProfilerRun, (2<<20)*memoryProfilerRun),
fmt.Sprintf(`0: 0 \[%v: %v\] @( 0x[0-9,a-f]+)+
# 0x[0-9,a-f]+ runtime/pprof\.allocateReflectTransient\+0x[0-9,a-f]+ .*/runtime/pprof/mprof_test.go:48
`, memoryProfilerRun, (2<<20)*memoryProfilerRun),
}
for _, test := range tests {
if !regexp.MustCompile(test).Match(buf.Bytes()) {
t.Fatalf("The entry did not match:\n%v\n\nProfile:\n%v\n", test, buf.String())
}
}
}