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Viewing File: mprof_test.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.
//go:build !js
package pprof
import (
"bytes"
"fmt"
"internal/profile"
"reflect"
"regexp"
"runtime"
"testing"
"unsafe"
)
var memSink any
func allocateTransient1M() {
for i := 0; i < 1024; i++ {
memSink = &struct{ x [1024]byte }{}
}
}
//go:noinline
func allocateTransient2M() {
memSink = make([]byte, 2<<20)
}
func allocateTransient2MInline() {
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.nextSample is updated to 1.
for i := 0; i < 1024; i++ {
memSink = make([]byte, 1024)
}
// Do the interesting allocations.
allocateTransient1M()
allocateTransient2M()
allocateTransient2MInline()
allocatePersistent1K()
allocateReflect()
memSink = nil
runtime.GC() // materialize stats
memoryProfilerRun++
tests := []struct {
stk []string
legacy string
}{{
stk: []string{"runtime/pprof.allocatePersistent1K", "runtime/pprof.TestMemoryProfiler"},
legacy: 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:47
# 0x[0-9,a-f]+ runtime/pprof\.TestMemoryProfiler\+0x[0-9,a-f]+ .*runtime/pprof/mprof_test\.go:82
`, 32*memoryProfilerRun, 1024*memoryProfilerRun, 32*memoryProfilerRun, 1024*memoryProfilerRun),
}, {
stk: []string{"runtime/pprof.allocateTransient1M", "runtime/pprof.TestMemoryProfiler"},
legacy: 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:24
# 0x[0-9,a-f]+ runtime/pprof\.TestMemoryProfiler\+0x[0-9,a-f]+ .*runtime/pprof/mprof_test.go:79
`, (1<<10)*memoryProfilerRun, (1<<20)*memoryProfilerRun),
}, {
stk: []string{"runtime/pprof.allocateTransient2M", "runtime/pprof.TestMemoryProfiler"},
legacy: 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:30
# 0x[0-9,a-f]+ runtime/pprof\.TestMemoryProfiler\+0x[0-9,a-f]+ .*runtime/pprof/mprof_test.go:80
`, memoryProfilerRun, (2<<20)*memoryProfilerRun),
}, {
stk: []string{"runtime/pprof.allocateTransient2MInline", "runtime/pprof.TestMemoryProfiler"},
legacy: 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\.allocateTransient2MInline\+0x[0-9,a-f]+ .*runtime/pprof/mprof_test.go:34
# 0x[0-9,a-f]+ runtime/pprof\.TestMemoryProfiler\+0x[0-9,a-f]+ .*runtime/pprof/mprof_test.go:81
`, memoryProfilerRun, (2<<20)*memoryProfilerRun),
}, {
stk: []string{"runtime/pprof.allocateReflectTransient"},
legacy: 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:55
`, memoryProfilerRun, (2<<20)*memoryProfilerRun),
}}
t.Run("debug=1", func(t *testing.T) {
var buf bytes.Buffer
if err := Lookup("heap").WriteTo(&buf, 1); err != nil {
t.Fatalf("failed to write heap profile: %v", err)
}
for _, test := range tests {
if !regexp.MustCompile(test.legacy).Match(buf.Bytes()) {
t.Fatalf("The entry did not match:\n%v\n\nProfile:\n%v\n", test.legacy, buf.String())
}
}
})
t.Run("proto", func(t *testing.T) {
var buf bytes.Buffer
if err := Lookup("heap").WriteTo(&buf, 0); err != nil {
t.Fatalf("failed to write heap profile: %v", err)
}
p, err := profile.Parse(&buf)
if err != nil {
t.Fatalf("failed to parse heap profile: %v", err)
}
t.Logf("Profile = %v", p)
stks := stacks(p)
for _, test := range tests {
if !containsStack(stks, test.stk) {
t.Fatalf("No matching stack entry for %q\n\nProfile:\n%v\n", test.stk, p)
}
}
if !containsInlinedCall(TestMemoryProfiler, 4<<10) {
t.Logf("Can't determine whether allocateTransient2MInline was inlined into TestMemoryProfiler.")
return
}
// Check the inlined function location is encoded correctly.
for _, loc := range p.Location {
inlinedCaller, inlinedCallee := false, false
for _, line := range loc.Line {
if line.Function.Name == "runtime/pprof.allocateTransient2MInline" {
inlinedCallee = true
}
if inlinedCallee && line.Function.Name == "runtime/pprof.TestMemoryProfiler" {
inlinedCaller = true
}
}
if inlinedCallee != inlinedCaller {
t.Errorf("want allocateTransient2MInline after TestMemoryProfiler in one location, got separate location entries:\n%v", loc)
}
}
})
}
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