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Profiling
Go Application
Go Conference 2018 Autumn #gocon #gocon_a
@orisano
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ࣗݾհ
• @orisano
• ۦ͚ग़͠ΞϓϦέʔγϣϯΤϯδχΞ
• ޮతͳdocker buildΛࢦ͍ͯ͠Δ
• ύϑΥʔϚϯεʹڵຯ͕͋Δ
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ࠓ͢͜ͱ
• ߴԽ, ϓϩϑΝΠϦϯάΛߦ͖࣮ͬͯͨྫ
• Ͳ͏͍͏վળΛ͢Δͷ͔
• Ͳ͏͍͏ϓϩηεͳͷ͔
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ը૾มαʔόͷ
kubeletͷ
go-swaggerͷ
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ը૾มαʔόͷ
kubeletͷ
go-swaggerͷ
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ৄղ
γεςϜɾύϑΥʔϚϯε
ྠಡձ
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ࡐͱͯ͠؆୯ͳ
ը૾มαʔόΛѻͬͨ
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ෛՙΛ͔͚Δͱ
ΞϓϦέʔγϣϯ͕མͪͨ
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topΛΈͨ
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མͪͨݪҼ
ϝϞϦͷ༻ྔ
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ϝϞϦϦʔΫʁ
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pprofΛ͏
GODEBUG=allocfreetrace=1
͢Δ
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runtimeʹखΛೖΕΔ
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GC͍ͯ͠Δͱ͖ʹ
ࢀরgraphΛdump͢ΔΑ͏
ʹͨ͠
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No content
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ͪΌΜͱpprofͷmemory
goroutineͷΛݟΔ
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ಉ࣌มʹ੍ݶΛ͚ͭΔ
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ແࣄղܾͨ͠
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͋ͱߴԽ
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disintegration/imaging
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Boundary Check
Elimination
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GoجຊఴࣈΞΫηε͢Δͱ
ൣғνΣοΫ͕ೖΔ
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ίϯύΠϥ͕҆શͩͱ
அ͢Δͱফ͑Δ
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͜ΕΛ
Boundary Check
Elimination (BCE)ͱ͍͏
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͜ΕΛ
Boundary Check
Elimination (BCE)ͱ͍͏
ref: https://go101.org/article/bounds-check-elimination.html
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goͷඪ४ϥΠϒϥϦͰ
ͦͦ͜͜ݟΔ
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ը૾ͷಡΈࠐΈ, มͳͲ
heavyʹఴࣈΞΫηε͢Δ
߹ͩͱޮՌ͕େ͖͍
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https://github.com/
disintegration/imaging/
pull/81
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https://github.com/
disintegration/imaging/
pull/81
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pprofͳͲͰ
ݪҼΛಛఆͨ͠Β
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·ͣ
BenchmarkΛॻ͜͏
*testing.B
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Benchmarkͷ݁ՌΛ
ͪΌΜͱݟΔ
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golang.org/x/tools/cmd/
benchcmp
golang.org/x/perf/cmd/
benchstat
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https://github.com/
disintegration/imaging/
pull/81
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ը૾มαʔόͷ
kubeletͷ
go-swaggerͷ
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kubeletͷCPU͕ෛՙ͕ߴ͍
ͱ૬ஊΛड͚ͨ
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Datadog͕ୟ͍ͯΔ
Metrics༻ͷEndpoint͕
ݪҼͳͷͰͱ͍͏ͩͬͨ
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kubeletnet/http/pprofΛ
import͍ͯ͠Δ
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͕ى͖͍ͯΔڥͷ
ใ͕औͬͯ͜ΕΔ
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prometheus/common
google/cadvisor
ͷҰ෦͕ॏ͍
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֘Օॴ
https://github.com/prometheus/
common/pull/148
ൃ֮ͷ1िؒલ͘Β͍ʹ
allocation freeʹͳͬͯ
2ഒ͘Β͍ૣ͘ͳ͍ͬͯͨ
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ͳΜ͔չ͔ͬͨ͠ͷͰ
https://github.com/prometheus/
common/pull/150
ߋʹͦΕΛ2ഒ͘Β͍ૣ͘͠·ͨ͠
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७ਮʹWrite͕ଟ͔ͬͨ
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strings.Replacerʹ
WriteString͕͋Γ·͢
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ஔରՕॴҎ֎
·ͱΊͯWriteͯ͘͠ΕΔ
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allocationى͜Βͳ͍ͷͰ࠷ߴ
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࣍ʹ
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google/cadvisorͷ
ListContainers͕ॏ͍
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google/cadvisorͷ
ListContainers͕ॏ͍
https://github.com/google/cadvisor/blob/8faf19092784b75fce10ce190d37e66f89de3612/container/common/helpers.go
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ioutil.ReadDirͱsyscall
͕ॏ͍ʁ
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ioutil.ReadDirͷதΛݟͯΈΔ
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ref: https://golang.org/src/io/ioutil/ioutil.go
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ref: https://golang.org/src/os/dir_unix.go
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ͳΜ͔ҎԼʹ͋ΔϑΝΠϧશ෦ʹ
lstatൃߦ͍ͯ͠Δ
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ref: https://golang.org/src/os/dir_unix.go
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readdirent͕ͬͯͭ͋Δ
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Ͳ͏Β͜Ε
entryͷtypeΛฦͯ͘͠ΕΔΒ͍͠
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google/cadvisorͷ
ListContainers͕ॏ͍
https://github.com/google/cadvisor/blob/8faf19092784b75fce10ce190d37e66f89de3612/container/common/helpers.go
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readdirentΛ͏·͑͘Ε
syscallͷճΛݮΒͤΔ
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͔͠͠
golangඪ४ͷreaddirent
typeΛऔಘͰ͖ͳ͍
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͔͠
࣮ʹඞཁͳॾʑ͕
privateʹͳ͍ͬͯΔ
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ඪ४͔Βͦ͜Λίϐϖ͢Δͱ
cadvisorͷ
LICENSE Checkʹ௨Βͳ͍
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࣮͜ͷํ๏
͍ΖΜͳϥΠϒϥϦͰΘΕ͍ͯΔ
goimports/internal/fastwalk
֎෦͔Βར༻Ͱ͖ͳ͍
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ѹతʹ֎෦͔Βར༻Ͱ͖ͳ͍
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github.com/karrick/godirwalk
Α͏͘ݟ͚ͭͨ
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https://github.com/google/
cadvisor/pull/2085
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No content
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Memoryܥͷऔಘ͚ͩͨΒ͍
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https://lkml.org/lkml/
2018/7/3/101
cgroups v1ܥͷΒ͍͠
kernelͷversionΛ͋͛Α͏
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ը૾มαʔόͷ
kubeletͷ
go-swaggerͷ
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ࣗಈੜΛ݁ߏ͍ͬͯΔͷͰ͕͢
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go-swagger͕͍
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ૣ͘͠Α͏
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cliܥͷϓϩϑΝΠϦϯάʹ
pkg/profile͕ศར
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No content
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https://github.com/go-openapi/
swag/pull/25
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No content
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෦Ͱຖճ
MustCompileͯͨ͠
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No content
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https://github.com/go-openapi/
loads/pull/19
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͍json.UnmarshalΛ
deepcopyͷͨΊʹ2ճͯͨ͠
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json.Unmarshal 1ճ
{de,en}coding/gob
Ͱ͓Λͨ͠
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·ͱΊ
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ීஈ͍ͬͯΔͷͰ
ΧϦΧϦʹνϡʔχϯά
͞Ε͍ͯΔΘ͚Ͱͳ͍
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͕͍ࣗͱײͨ͡Β
ܭଌͯ͠ΈΔ
վળͯ͠ΈΔ
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cliͳΒpkg/profileΛࠐΜͰݟΔ
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serverͳΒnet/http/pprofΛ͏
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ݪҼͷಛఆͷखॿ͚ͷͨΊʹ
svgʹͨ͠Γ
uber/go-torchΛͬͯ
flamegraphʹͨ͠Γ
flamescopeΛͬͨΓ
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ݪҼΛಛఆͨ͠Β
BenchmarkΛॻ͘
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-count=10ͳͲΛͬͨ͋ͱʹ
benchcmp or benchstat
ͯ͠ޮՌ͕ग़͍ͯΔ͜ͱΛ֬ೝ
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͋ͱPRΛ͛Δ
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͜Μͳʹ
ύϑΥʔϚϯενϡʔχϯά
͍͢͠ݴޠଞʹͳ͍
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͍ͬͯ͜͏
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ඞཁΛײ͡Δ·Ͱ
νϡʔχϯά͠ͳ͍
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Ͱ
ܭଌ͕Ͱ͖Δڥ༻ҙ͖͢