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Parallel::Pipesの紹介
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Shoichi Kaji
May 31, 2025
Programming
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Parallel::Pipesの紹介
2025/05/31 Houtou.pm #1
Shoichi Kaji
May 31, 2025
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Transcript
Parallel::Pipesͷհ Shoichi Kaji
࣍ • Perlͷฒྻ/ฒߦॲཧ • PerlͷforkϞδϡʔϧ • Parallel::ForkManager • Parallel::Prefork •
ฒྻCPANΫϥΠΞϯτΛ࡞Γ͍ͨʂ • Parallel::PipesΛ࡞ͬͨ • ʑͷPerlεΫϦϓτʹฒྻॲཧΛ
Perlͷฒྻ/ฒߦॲཧ • PerlʹҰԠthread͕͋Δ͕ɺ5.20ΑΓެࣜʹ discouragedͱͳ͍ͬͯΔ • Πϕϯτۦಈʹؔͯ͠ɺPerlຊମʹͦͷαϙʔτ ͳ͍͕ɺ͍͔ͭ͘ͷ࣭ͷߴ͍Ϟδϡʔϧ͕ͦͷػೳΛ ఏڙ͍ͯ͠Δ: AnyEvent, Mojo,
IO::Async, etc • forkͯ͠ෳϓϩηε্ཱͪ͛ɺͦΕͰฒྻॲཧΛ͢ ΔબࢶͪΖΜ͋Δɻࠓ͜͜Λѻ͍͍ͨ
PerlͷforkϞδϡʔϧ • forkͯ͠ෳͷchildϓϩηεΛىಈ͠ɺchildϓϩηεͷཧɺ σʔλͷड͚͠Λखॿ͚ͯ͘͠ΕΔϞδϡʔϧͱͯ͠༗໊ͳͷ2બ • Parallel::ForkManager • Balazs Szabo͞Μ࡞ •
͔ͳΓੲ͔Β͋ΔϞδϡʔϧ • Parallel::Prefork • Oku Kazuho͞Μ࡞ • HTTP server StartletͰΘΕ͍ͯΔ
Parallel::ForkManager • preforkͰͳ͘ॲཧͷͨͼʹ ຖճforkΛݺͿελΠϧ • ൺֱతCLIͳͲͰΘΕΔ Πϝʔδ • fi leܦ༝Ͱchildϓϩηεͷ
݁ՌΛड͚औΕΔ
Parallel::ForkManager ॲཧ։࢝ ॲཧऴྃ parent child child child child parent childʹೖྗσʔλΛ͢
child͔Β݁ՌσʔλΛड͚औΔ
Parallel::Prefork • σʔϞϯϓϩηε༻ • childϓϩηεͷࢹ • γάφϧϋϯυϦϯά • childϓϩηεΛҰఆʹอͭ •
parent, childϓϩηεؒͰͷ σʔλͷड͚͠ػೳ༗͍ͯ͠ͳ͍
Parallel::Prefork ॲཧ։࢝ ॲཧऴྃ parent child child child child childΛࢹ͢Δ child
ฒྻCPANΫϥΠΞϯτΛ࡞Γ͍ͨ! • CPANϞδϡʔϧΛฒྻʹΠϯετʔϧͰ͖ΔCPAN client cpmΛ࡞ͬͨ • "CPANϞδϡʔϧΠϯετʔϧ"ΛɺͦΕࣗಠཱ࣮ͯ͠ߦͰ͖Δࡉ͔͍λεΫʹΘ͚ɺͦΕ Λฒྻʹॲཧ͍ͯ͘͠ઓུΛͨͯͨɻͱͳΔͱࡉ͔͍λεΫΛͲΜͲΜchildϓϩηεʹ͛ Δɺॲཧ͕ऴΘͬͨΒଈ࠲ʹ݁ՌΛಘΔɺͱ͍͏Έ͕ཉ͍͠ •
Parallel::ForkManager ? • childϓϩηεىಈ࣌ʹλεΫΛ1ͭͤΔͷΈͰԿͤͳ͍ • ݁Ռͷड͚औΓ͕ fi leϕʔεͩͱɺ݁Ռ͕ग़͍ͯΔ͜ͱʹଈ࠲ʹؾ͚ͳ͍ • Parallel::Prefork ? • childϓϩηεͱͷσʔλͷΓͱΓͷػߏ༻ҙ͞Ε͍ͯͳ͍ • childϓϩηεΛࢹͯ͠΄͍͠Θ͚Ͱͳ͍
ฒྻCPANΫϥΠΞϯτΛ࡞Γ͍ͨ! ॲཧ։࢝ ॲཧऴྃ parent child child child child childͱํʹσʔλΛΓͱΓ͍ͨ͠ childͷॲཧ͕ऴΘͬͨ͜ͱΛଈ࠲ʹݕ͍ͨ͠
-> pipeͱselectͰ࣮ݱͰ͖ͦ͏ʂ child
Parallel::Pipes • Parallel::PipesΛ࡞ͬͨ • preforkͨ͠childϓϩηεͱ pipeͰํʹଓ͠ taskɺ݁Ռͷड͚͠Λߦ͏ɻ pipeΛselect͠ɺॲཧऴྃΛ ଈ࠲ʹݕ͢Δ •
Parallel::PipescpmͷதͰΘΕ cpmͷͦ͞ͷͷͱͳ͍ͬͯΔ
Parallel::Pipes • cpmͰͷParallel::Pipesͷ͍ํ ͋Δtaskͷ͕ྃผͷtaskΛੜΉ ্ؔɺٕతͰ͋Δ • ҰํͰParallel::Pipes::App->map ୯ʹΈࠐΈؔmapͷฒྻ൛ ͱࢥͬͯ͏͜ͱͰ͖Δ •
ʑͷPerlεΫϦϓτʹ ฒྻॲཧΛ • Perlbetter shellͱݴΘΕΔ • Έͳ͞Μʑͷࡉʑͨ͠λεΫΛPerlεΫϦϓτΛॻ͘͜ͱͰ͜ͳ͍ͯ͠Δͱࢥ͏ • ͦ͏ͨ͠εΫϦϓτͰฒྻॲཧΛॻ͘ͷɺͳ͔ͳ͔ͳ͍Α͏ʹࢥ͏ •
ҰํͰ Parallel::Pipes::App->mapΛ͔ͳΓͷέʔεͰɺ ΈࠐΈؔmapͷdrop in replacement ͱͯ͑͠Δ • ͪΐͬͱͨ͠ͷͰฒྻԽ͘͠ͳΔͱɺલఏ͕มΘΔ 😉 • ʑͷPerlεΫϦϓτʹฒྻॲཧΛೖΕͯΈΔͷͲ͏ ? • ྫ: https://github.com/skaji/binary-install/blob/main/src/lib/App.pm#L500 https://github.com/skaji/build.pl/blob/main/src/lib/App.pm#L242
·ͱΊ • PerlͷฒྻॲཧϞδϡʔϧParallel::PipesΛհ ͨ͠ • cpm෦ͰΈʹΘΕ͍ͯΔ • ҰํɺͦΕΈࠐΈؔmapͷ͓खܰฒྻ൛ͱ ͯ͠͏͜ͱͰ͖Δ •
ʑͷPerlεΫϦϓτͰฒྻॲཧΛ 😉