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Working with UNIX Process 6/7 Chapter
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Yuta Totz
March 05, 2016
Programming
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Working with UNIX Process 6/7 Chapter
Yuta Totz
March 05, 2016
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Transcript
Working with UNIX Process 6. Resource Limit / 7. Environment
of Processes
ࠓֶͿ͜ͱ • ϓϩηεʹϦιʔεͷ੍ݶ͕͋Δ • ੍ݶͷݟ͚ͭํ • ιϑτϦϛοτͷҾ্͖͛ɺ੍ݶ • ϓϩηεʹڥ͕͋Δ •
ڥมͷࢀরͷํ
6ষ ϓϩηεͷϦιʔε੍ݶ
ϓϩηεʹϦιʔεͷ੍ݶ͕ ͋Δ • Ϧιʔε͕ด͡ΒΕͳ͍ͱϑΝΠϧσΟεΫϦϓλ ͷ൪߸͕૿Ճ͠ଓ͚Δ • 1ϓϩηε͋ͨΓͲΕ͘Β͍ͷϑΝΠϧσΟεΫϦ ϓλΛ࣋ͯΔͷ͔ʁ • =>
ΧʔωϧʹΑͬͯ1ϓϩηε͝ͱʹϦιʔεͷ੍ ݶ͕ઃఆ͞Ε͍ͯΔʂ
੍ݶΛݟ͚ͭΔ • :NOFILEγϯϘϧΛҾʹ͢Δ (Φϓγϣϯతͳ) • [ϑΝΠϧσΟεΫϦϓλͷιϑτϦϛοτ, ~ͷϋʔυϦϛοτ] • http://rurema.clear-code.com/1.9.3/method/Process/m/ getrlimit.html
p Process.getrlimit(:NOFILE) => [256, 9223372036854775807]
ιϑτϦϛοτͱϋʔυϦϛο τ • ιϑτϦϛοτιϑτଆͰنఆ্ͨ͠ݶ • มߋͰ͖Δ • ࣮ମϋʔυϦϛοτͰɺͬͪ͜ͱΜͰͳ͘େ͖ͳ •
sysctl(8) • http://www.usupi.org/sysad/240.html
ιϑτϦϛοτΛҾ্͖͛Δ • ୈ̏ҾͰ৽͍͠ϋʔυϦϛοτࢦఆͰ͖ Δ Process.setrlimit(:NOFILE, 4096) p Process.getrlimit(:NOFILE) => [4096,
4096]
ιϑτϦϛοτΛҾ্͖͛Δ • ιϑτϦϛοτΛϋʔυϦϛοτͷ·ͰҾ ্͖͛Δ ɹProcess.setrlimit(:NOFILE, Process.getrlimit(:NOFILE)[1])
੍ݶΛ͑ͨͱ͖ • ιϑτϦϛοτΛ͑ͨ߹ʹErrno::EMFILEྫ֎Λൃੜ͢Δ # ΦʔϓϯͰ͖ΔϑΝΠϧͷ࠷େΛ3ʹઃఆ # ඪ४ετϦʔϜͰϑΝΠϧσΟεΫϦϓλΛ3ͭ͏ͨΊ # ͢Ͱʹ্ݶʹୡ͍ͯ͠Δঢ়ଶʹͳΔ Process.setrlimit(:NOFILE,
3) File.open(‘/dev/null’) Errno::EMFILE: Too many open files - /dev/null
ͦͷଞͷγεςϜϦιʔεͷ੍ݶͷ֬ೝɾมߋ • Process.getrlimitʹͤΔΦϓγϣϯͷϦετυΩϡϝϯτࢀরɹ • http://ruby-doc.org/core-1.9.3/Process.html#method-c-setrlimit # ϓϩηεͷϢʔβ͕࡞Ͱ͖Δ࠷େϓϩηε Process.getrlimit(:NPROC) # ϓϩηε͕࡞Ͱ͖ΔϑΝΠϧαΠζͷ࠷େ
Process.getrlimit(:FSIZE) # ϓϩηεελοΫͷ࠷େαΠζ Process.getrlimit(:STACK)
࣮༻ྫ • γεςϜϦιʔεͷ੍ݶͷมߋ͕ඞཁʹͳΔϓϩάϥϜ͋Μ·ͳ͍…ɻ͚Ͳಛ ผͳ༻్ͷπʔϧͰͱͯॏཁʹͳΔ • ex. ϓϩηε͕ಉ࣌ʹઍͷωοτϫʔΫίωΫγϣϯΛѻ͏ඞཁ͕͋Δ • httpύϑΥʔϚϯεπʔϧͷhttperf(1) •
httperf —hog —server www —num-conn 5000 • => ಉ࣌ʹ5000ͷίωΫγϣϯΛ࡞͠Α͏ͱ͢Δ • ιϑτϦϛοτ͕σϑΥϧτͩͱ໌Β͔ʹ·͍ͣͷͰɺhttperf(1)࣮ߦલʹࣗ ͷιϑτϦϛοτΛҾ্͖͛Δ
࣮༻ྫ (2) • ੍ݶ͢Δྫ • ୈࡾऀͷίʔυͷ࣮ߦ࣌ʹ੍Λ͚ͭΔ • ϓϩηεࣗʹڐ͞Ε͍ͯΔҎ্ͷϦιʔε ͑ͳ͘ͳΔ
6ষͷγεςϜίʔϧ • getrlimit(2) • Process.getrlimit • setr-limit(2) • Process.setrlimit
7ষ ϓϩηεͷڥ
ϓϩηεʹڥ͕͋Δ • ʮڥʯʹʮڥมʯ • keyͱvalueͷΈ߹Θͤ => ϓϩηεͰ͑ΔσʔλΛ อ࣋͢Δͷ • શͯͷࢠϓϩηεϓϩηε͔ΒڥมΛҾ͖ܧ͙
• ڥมϓϩηε͝ͱʹଘࡏ͠ɺͦΕͧΕͷϓϩηε ͰάϩʔόϧʹΞΫηεͰ͖Δ
example $ MESSAGE=‘wing it’ ruby -e “puts ENV[‘MESSAGE’]” ENV[‘MESSAGE’] =
‘wing it’ system “echo $MESSAGE”
͜Εͬͯϋογϡʁ • ϋογϡΦϒδΣΫτͰͳ͍ (merge͕ͳ͍ͱ ͔) => ϋογϡϥΠΫʹΞΫηεͰ͖ΔAPI͕༻ ҙ͞Ε͍ͯΔ Process.setrlimit(:NOFILE, 4096)
p Process.getrlimit(:NOFILE) => [4096, 4096] puts ENV[‘EDITOR’] => vim puts ENV.has_key?(‘PATH’) => true puts ENV.is_a?(Hash) => false
࣮༻ྫ • ίϚϯυϥΠϯπʔϧʹೖྗΛ͢ํ๏ͱͯ͠Α͘࠾༻͞ΕΔ • ͜ͷํ͕ίϚϯυϥΠϯ͔Β༩͑ΒΕͨΦϓγϣϯΛղੳ͢ ΔΑΓϥΫͱ͍͏ϝϦοτ͋Δ Process.setrlimit(:NOFILE, 4096) p Process.getrlimit(:NOFILE)
=> [4096, 4096] ENV.is $ RAILS_ENV=production rails server $ EDITOR=mate bundle open actionpack $ QUEUE=default rake resque:work
7ষͷγεςϜίʔϧ • setenv(3), getenv(3) • ڥมΛѻ͏Cݴޠͷؔ • environ(7)
ࠓֶͿ͜ͱ • ϓϩηεʹϦιʔεͷ੍ݶ͕͋Δ • ੍ݶͷݟ͚ͭํ • ιϑτϦϛοτͷҾ্͖͛ɺ੍ݶ • ϓϩηεʹڥ͕͋Δ •
ڥมͷࢀরͷํ