func BenchmarkHeapProfile(b *testing.B) {
f, err := os.Open("testdata/__prof")
if err != nil {
b.Fatal(err)
}
defer f.Close()
p, err := parser.NewHeapProfParser(f)
if err != nil {
b.Fatal(err)
}
bsize := int64(0)
for i := 0; i < b.N; i++ {
rec, err := p.ReadRecord()
if err == io.EOF {
// rewind.
bsize += tell(f)
f.Seek(0, 0)
p, _ = parser.NewHeapProfParser(f)
continue
}
_ = rec
}
bsize += tell(f)
b.SetBytes(bsize / int64(b.N))
}
func TestHeapProfile(t *testing.T) {
f, err := os.Open("testdata/heap.prof")
if err != nil {
t.Fatal(err)
}
defer f.Close()
p, err := parser.NewHeapProfParser(f)
if err != nil {
t.Fatal(err)
}
syms := readSymbols("testdata/heap.prof.symbols")
printed := 0
for {
rec, err := p.ReadRecord()
if err == io.EOF {
break
}
s := stringify(rec.Trace, syms)
if printed < 10 {
printed++
t.Logf("%d:%d [%d:%d] @ %v",
rec.LiveObj, rec.LiveBytes,
rec.AllocObj, rec.AllocBytes, s)
}
}
}
func TestHeapProfileReport(t *testing.T) {
f, err := os.Open("testdata/heap.prof")
if err != nil {
t.Fatal(err)
}
defer f.Close()
p, err := parser.NewHeapProfParser(f)
if err != nil {
t.Fatal(err)
}
syms := readSymbols("testdata/heap.prof.symbols")
resolve := func(u uint64) string { s, _ := lookup(u, syms); return s }
reporter := &Reporter{Resolver: resolve}
for {
rec, err := p.ReadRecord()
if err == io.EOF {
break
}
p.AdjustRecord(&rec, resolve)
reporter.Add(rec.Trace,
rec.LiveObj, rec.LiveBytes,
rec.AllocObj, rec.AllocBytes)
}
entries := reporter.ReportByFunc(ColAllocBytes)
buf := new(bytes.Buffer)
w := tabwriter.NewWriter(buf, 0, 8, 2, ' ', 0)
fmt.Fprintf(w, "\nalloc space\tallocs\tin use space\tin use count\tFunction\n")
const MB = 1 << 20
for _, e := range entries {
fmt.Fprintf(w, "%.5g\t%d\t%.3g\t%d\t%s\n",
e.Self[ColAllocBytes]/MB,
int64(e.Self[ColAllocObj]),
e.Self[ColLiveBytes]/MB,
int64(e.Self[ColLiveObj]), e.Name)
}
w.Flush()
t.Log(buf.String())
}
func LoadProfile(r *report.Reporter, f io.ReadCloser) {
defer f.Close()
buf := bufio.NewReader(f)
magic, _ := buf.Peek(4)
switch string(magic) {
case "heap":
// Heap profile.
p, err := parser.NewHeapProfParser(buf)
if err != nil {
log.Fatal(err)
}
for {
rec, err := p.ReadRecord()
if err == io.EOF {
break
}
p.AdjustRecord(&rec,
func(uint64) string { return "" })
r.Add(rec.Trace,
rec.LiveObj, rec.LiveBytes,
rec.AllocObj, rec.AllocBytes)
}
default:
// CPU Profile.
p, err := parser.NewCpuProfParser(buf)
if err != nil {
log.Fatal(err)
}
for {
trace, count, err := p.ReadTrace()
if trace == nil && err == io.EOF {
break
}
r.Add(trace, int64(count))
}
}
}
Expect(profiler.Profile).To(Panic())
})
})
Describe("memory profiling", func() {
It("profiles memory usage", func() {
profiler := profiler.New("", memProfilePath, 1*time.Millisecond, logger)
profiler.Profile()
time.Sleep(2 * time.Millisecond)
profiler.Stop()
f, err := os.Open(memProfilePath)
Expect(err).NotTo(HaveOccurred())
_, err = parser.NewHeapProfParser(f)
Expect(err).NotTo(HaveOccurred())
})
It("panics when there is an error", func() {
filePath := "/tmp/asdf/asdf.pprof"
profiler := profiler.New("", filePath, 1*time.Millisecond, logger)
Expect(profiler.Profile).To(Panic())
})
})
Describe("Stop", func() {
It("closes the both profile file handles", func() {
profiler := profiler.New(cpuProfilePath, memProfilePath, 1*time.Millisecond, logger)
profiler.Profile()