cmd/pprof: alloc_space top shows nothing on 1.7 #16128
Description
- What version of Go are you using (
go version)?
go version go1.7beta2 linux/amd64 - What operating system and processor architecture are you using (
go env)?
GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/go"
GORACE=""
GOROOT="/usr/local/go"
GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64"
CC="gcc"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build479686971=/tmp/go-build -gno-record-gcc-switches"
CXX="g++"
CGO_ENABLED="1"
- What did you do?
I'm trying to profile my benchmark memory usage with pprof.
cd $GOPATH/src/github.com/ernado/sdp
go version
go test -bench BenchmarkDecoder_Decode -memprofile=mem.out -o sdp.test
go tool pprof -alloc_space -top sdp.test mem.outI've created repo that runs this commands in docker container for go 1.6 and 1.7 to isolate enviroment and make it easy to reproduce:
https://github.com/ernado/go-no-bench
To use it, just run make.
I've also uploaded docker images to registry.
On 1.6 it works OK.
- What did you expect to see?
This is output of docker run -it --rm ernado/sdp-reproduce:1.6
573.65MB of 576.15MB total (99.57%)
Dropped 7 nodes (cum <= 2.88MB)
flat flat% sum% cum cum%
113.51MB 19.70% 19.70% 113.51MB 19.70% bytes.genSplit
113.40MB 19.68% 39.38% 130.40MB 22.63% github.com/ernado/sdp.(*Decoder).decodeAttribute
95.47MB 16.57% 55.96% 104.97MB 18.22% github.com/ernado/sdp.(*Decoder).decodeTimingField
71.75MB 12.45% 68.41% 98.25MB 17.05% github.com/ernado/sdp.(*Decoder).decodeTimeZoneAdjustments
50.50MB 8.77% 77.17% 50.50MB 8.77% github.com/ernado/sdp.(*Decoder).decodeKV
44.01MB 7.64% 84.81% 51.51MB 8.94% github.com/ernado/sdp.(*Decoder).decodeBandwidth
29MB 5.03% 89.85% 576.15MB 100% github.com/ernado/sdp.(*Decoder).decodeField
17.50MB 3.04% 92.88% 25MB 4.34% github.com/ernado/sdp.(*Decoder).decodeConnectionData
15.50MB 2.69% 95.57% 15.50MB 2.69% github.com/ernado/sdp.parseNTP
10.50MB 1.82% 97.40% 10.50MB 1.82% bytes.Join
7.50MB 1.30% 98.70% 26MB 4.51% github.com/ernado/sdp.(*Decoder).decodeRepeatTimes
5MB 0.87% 99.57% 5MB 0.87% net.parseIPv4
0 0% 99.57% 113.51MB 19.70% bytes.Split
0 0% 99.57% 576.15MB 100% github.com/ernado/sdp.(*Decoder).Decode
0 0% 99.57% 26MB 4.51% github.com/ernado/sdp.(*Decoder).decodeEncryption
0 0% 99.57% 219.04MB 38.02% github.com/ernado/sdp.(*Decoder).decodeMedia
0 0% 99.57% 56.50MB 9.81% github.com/ernado/sdp.(*Decoder).decodeMediaDescription
0 0% 99.57% 28.50MB 4.95% github.com/ernado/sdp.(*Decoder).decodeOrigin
0 0% 99.57% 576.15MB 100% github.com/ernado/sdp.(*Decoder).decodeSession
0 0% 99.57% 130.97MB 22.73% github.com/ernado/sdp.(*Decoder).decodeTiming
0 0% 99.57% 103.51MB 17.97% github.com/ernado/sdp.(*Decoder).subfields
0 0% 99.57% 576.15MB 100% github.com/ernado/sdp.BenchmarkDecoder_Decode
0 0% 99.57% 5MB 0.87% github.com/ernado/sdp.decodeIP
0 0% 99.57% 103.51MB 17.97% github.com/ernado/sdp.subfields
0 0% 99.57% 5MB 0.87% net.ParseIP
0 0% 99.57% 576.15MB 100% runtime.goexit
0 0% 99.57% 576.15MB 100% testing.(*B).launch
0 0% 99.57% 576.15MB 100% testing.(*B).runN
- What did you see instead?
And this is docker run -it --rm ernado/sdp-reproduce:1.7:
565.81MB of 565.81MB total ( 100%)
flat flat% sum% cum cum%
565.81MB 100% 100% 565.81MB 100% [sdp.test]