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net: (Interface).Addrs() slowdown #4866

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gpaul opened this issue Feb 21, 2013 · 4 comments
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net: (Interface).Addrs() slowdown #4866

gpaul opened this issue Feb 21, 2013 · 4 comments
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@gpaul
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gpaul commented Feb 21, 2013

I saw a pretty significant slowdown of (Interface).Addrs() after

changeset:   15316:53a4da6a4f4a
user:        Mikio Hara <mikioh.mikioh@gmail.com>
date:        Wed Feb 20 07:31:44 2013 +0900
summary:     net: return correct point-to-point interface address on linux

benchmark         old ns/op    new ns/op    delta
BenchmarkAddrs        55663     92844026  +166696.66%

go version: tip
environment: (Fedora 16) Linux me 3.4.7-1.fc16.x86_64 #1 SMP Mon Jul 30 16:37:23 UTC
2012 x86_64 x86_64 x86_64 GNU/Linux

To run the benchmark, clpatch CL 7385048 then run

# go test -c -i net
# ./net.test -test.run=NONE -test.bench=Addrs -test.cpuprofile cpu.out
# go tool pprof net.test cpu.out

Total: 188 samples
     187  99.5%  99.5%      187  99.5% syscall.Syscall6
       1   0.5% 100.0%        1   0.5% runtime.settype
       0   0.0% 100.0%        1   0.5% growslice1
       0   0.0% 100.0%        1   0.5% makeslice1
       0   0.0% 100.0%      187  99.5% net.(*Interface).Addrs
       0   0.0% 100.0%      188 100.0% net.BenchmarkInterfaceAddrs
       0   0.0% 100.0%      187  99.5% net.InterfaceByIndex
       0   0.0% 100.0%        1   0.5% net.Interfaces
       0   0.0% 100.0%      187  99.5% net.addrTable
       0   0.0% 100.0%      187  99.5% net.interfaceAddrTable
       0   0.0% 100.0%      188 100.0% net.interfaceTable
       0   0.0% 100.0%        1   0.5% runtime.growslice
       0   0.0% 100.0%      188 100.0% schedunlock
       0   0.0% 100.0%      188 100.0% syscall.NetlinkRIB
       0   0.0% 100.0%        1   0.5% syscall.ParseNetlinkMessage
       0   0.0% 100.0%        2   1.1% syscall.Recvfrom
       0   0.0% 100.0%      185  98.4% syscall.Sendto
       0   0.0% 100.0%        2   1.1% syscall.recvfrom
       0   0.0% 100.0%      185  98.4% syscall.sendto
       0   0.0% 100.0%      188 100.0% testing.(*B).launch
       0   0.0% 100.0%      188 100.0% testing.(*B).runN
@remyoudompheng
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Comment 1:

You may want to try https://golang.org/cl/7403045
and report the results.

@gpaul
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gpaul commented Feb 21, 2013

Comment 2:

Thanks, that's quite a bit better but still quite slow. 
benchmark                    old ns/op    new ns/op    delta
BenchmarkInterfaceAddrs-3     94722139      3843655  -95.94%
Mikio says he's working on it.

@mikioh
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mikioh commented Feb 21, 2013

Comment 3:

https://golang.org/cl/7384048/

Status changed to Started.

@mikioh
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mikioh commented Feb 28, 2013

Comment 4:

This issue was closed by revision 322214c.

Status changed to Fixed.

@rsc rsc added this to the Go1.1 milestone Apr 14, 2015
@rsc rsc removed the go1.1maybe label Apr 14, 2015
@golang golang locked and limited conversation to collaborators Jun 24, 2016
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