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Profiling Go Application
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orisano
November 25, 2018
Technology
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Profiling Go Application
orisano
November 25, 2018
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Transcript
Profiling Go Application Go Conference 2018 Autumn #gocon #gocon_a @orisano
ࣗݾհ • @orisano • ۦ͚ग़͠ΞϓϦέʔγϣϯΤϯδχΞ • ޮతͳdocker buildΛࢦ͍ͯ͠Δ • ύϑΥʔϚϯεʹڵຯ͕͋Δ
ࠓ͢͜ͱ • ߴԽ, ϓϩϑΝΠϦϯάΛߦ͖࣮ͬͯͨྫ • Ͳ͏͍͏վળΛ͢Δͷ͔ • Ͳ͏͍͏ϓϩηεͳͷ͔
ը૾มαʔόͷ kubeletͷ go-swaggerͷ
ը૾มαʔόͷ kubeletͷ go-swaggerͷ
ৄղ γεςϜɾύϑΥʔϚϯε ྠಡձ
ࡐͱͯ͠؆୯ͳ ը૾มαʔόΛѻͬͨ
ෛՙΛ͔͚Δͱ ΞϓϦέʔγϣϯ͕མͪͨ
topΛΈͨ
མͪͨݪҼ ϝϞϦͷ༻ྔ
ϝϞϦϦʔΫʁ
pprofΛ͏ GODEBUG=allocfreetrace=1 ͢Δ
runtimeʹखΛೖΕΔ
GC͍ͯ͠Δͱ͖ʹ ࢀরgraphΛdump͢ΔΑ͏ ʹͨ͠
None
ͪΌΜͱpprofͷmemory goroutineͷΛݟΔ
ಉ࣌มʹ੍ݶΛ͚ͭΔ
ແࣄղܾͨ͠
͋ͱߴԽ
disintegration/imaging
Boundary Check Elimination
GoجຊఴࣈΞΫηε͢Δͱ ൣғνΣοΫ͕ೖΔ
ίϯύΠϥ͕҆શͩͱ அ͢Δͱফ͑Δ
͜ΕΛ Boundary Check Elimination (BCE)ͱ͍͏
͜ΕΛ Boundary Check Elimination (BCE)ͱ͍͏ ref: https://go101.org/article/bounds-check-elimination.html
goͷඪ४ϥΠϒϥϦͰ ͦͦ͜͜ݟΔ
ը૾ͷಡΈࠐΈ, มͳͲ heavyʹఴࣈΞΫηε͢Δ ߹ͩͱޮՌ͕େ͖͍
https://github.com/ disintegration/imaging/ pull/81
https://github.com/ disintegration/imaging/ pull/81
None
pprofͳͲͰ ݪҼΛಛఆͨ͠Β
·ͣ BenchmarkΛॻ͜͏ *testing.B
Benchmarkͷ݁ՌΛ ͪΌΜͱݟΔ
golang.org/x/tools/cmd/ benchcmp golang.org/x/perf/cmd/ benchstat
https://github.com/ disintegration/imaging/ pull/81
ը૾มαʔόͷ kubeletͷ go-swaggerͷ
kubeletͷCPU͕ෛՙ͕ߴ͍ ͱ૬ஊΛड͚ͨ
Datadog͕ୟ͍ͯΔ Metrics༻ͷEndpoint͕ ݪҼͳͷͰͱ͍͏ͩͬͨ
kubeletnet/http/pprofΛ import͍ͯ͠Δ
͕ى͖͍ͯΔڥͷ ใ͕औͬͯ͜ΕΔ
None
prometheus/common google/cadvisor ͷҰ෦͕ॏ͍
None
֘Օॴ https://github.com/prometheus/ common/pull/148 ൃ֮ͷ1िؒલ͘Β͍ʹ allocation freeʹͳͬͯ 2ഒ͘Β͍ૣ͘ͳ͍ͬͯͨ
None
ͳΜ͔չ͔ͬͨ͠ͷͰ https://github.com/prometheus/ common/pull/150 ߋʹͦΕΛ2ഒ͘Β͍ૣ͘͠·ͨ͠
None
७ਮʹWrite͕ଟ͔ͬͨ
strings.Replacerʹ WriteString͕͋Γ·͢
ஔରՕॴҎ֎ ·ͱΊͯWriteͯ͘͠ΕΔ
allocationى͜Βͳ͍ͷͰ࠷ߴ
࣍ʹ
google/cadvisorͷ ListContainers͕ॏ͍
None
google/cadvisorͷ ListContainers͕ॏ͍ https://github.com/google/cadvisor/blob/8faf19092784b75fce10ce190d37e66f89de3612/container/common/helpers.go
ioutil.ReadDirͱsyscall ͕ॏ͍ʁ
ioutil.ReadDirͷதΛݟͯΈΔ
ref: https://golang.org/src/io/ioutil/ioutil.go
ref: https://golang.org/src/os/dir_unix.go
ͳΜ͔ҎԼʹ͋ΔϑΝΠϧશ෦ʹ lstatൃߦ͍ͯ͠Δ
ref: https://golang.org/src/os/dir_unix.go
readdirent͕ͬͯͭ͋Δ
Ͳ͏Β͜Ε entryͷtypeΛฦͯ͘͠ΕΔΒ͍͠
google/cadvisorͷ ListContainers͕ॏ͍ https://github.com/google/cadvisor/blob/8faf19092784b75fce10ce190d37e66f89de3612/container/common/helpers.go
readdirentΛ͏·͑͘Ε syscallͷճΛݮΒͤΔ
͔͠͠ golangඪ४ͷreaddirent typeΛऔಘͰ͖ͳ͍
͔͠ ࣮ʹඞཁͳॾʑ͕ privateʹͳ͍ͬͯΔ
ඪ४͔Βͦ͜Λίϐϖ͢Δͱ cadvisorͷ LICENSE Checkʹ௨Βͳ͍
࣮͜ͷํ๏ ͍ΖΜͳϥΠϒϥϦͰΘΕ͍ͯΔ goimports/internal/fastwalk ֎෦͔Βར༻Ͱ͖ͳ͍
ѹతʹ֎෦͔Βར༻Ͱ͖ͳ͍
github.com/karrick/godirwalk Α͏͘ݟ͚ͭͨ
https://github.com/google/ cadvisor/pull/2085
None
Memoryܥͷऔಘ͚ͩͨΒ͍
https://lkml.org/lkml/ 2018/7/3/101 cgroups v1ܥͷΒ͍͠ kernelͷversionΛ͋͛Α͏
ը૾มαʔόͷ kubeletͷ go-swaggerͷ
ࣗಈੜΛ݁ߏ͍ͬͯΔͷͰ͕͢
go-swagger͕͍
ૣ͘͠Α͏
cliܥͷϓϩϑΝΠϦϯάʹ pkg/profile͕ศར
None
https://github.com/go-openapi/ swag/pull/25
None
෦Ͱຖճ MustCompileͯͨ͠
None
https://github.com/go-openapi/ loads/pull/19
None
͍json.UnmarshalΛ deepcopyͷͨΊʹ2ճͯͨ͠
json.Unmarshal 1ճ {de,en}coding/gob Ͱ͓Λͨ͠
None
·ͱΊ
ීஈ͍ͬͯΔͷͰ ΧϦΧϦʹνϡʔχϯά ͞Ε͍ͯΔΘ͚Ͱͳ͍
͕͍ࣗͱײͨ͡Β ܭଌͯ͠ΈΔ վળͯ͠ΈΔ
cliͳΒpkg/profileΛࠐΜͰݟΔ
serverͳΒnet/http/pprofΛ͏
ݪҼͷಛఆͷखॿ͚ͷͨΊʹ svgʹͨ͠Γ uber/go-torchΛͬͯ flamegraphʹͨ͠Γ flamescopeΛͬͨΓ
ݪҼΛಛఆͨ͠Β BenchmarkΛॻ͘
-count=10ͳͲΛͬͨ͋ͱʹ benchcmp or benchstat ͯ͠ޮՌ͕ग़͍ͯΔ͜ͱΛ֬ೝ
͋ͱPRΛ͛Δ
͜Μͳʹ ύϑΥʔϚϯενϡʔχϯά ͍͢͠ݴޠଞʹͳ͍
͍ͬͯ͜͏
ඞཁΛײ͡Δ·Ͱ νϡʔχϯά͠ͳ͍
Ͱ ܭଌ͕Ͱ͖Δڥ༻ҙ͖͢