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Linuxコマンドでボトルネックを調べる
Kazuhiko Yamashita
March 20, 2018
Technology
17
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Linuxコマンドでボトルネックを調べる
俺の話を聞け!!LT大会 #8でトークした資料です
Kazuhiko Yamashita
March 20, 2018
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Transcript
ʙय़ͩʂՖคͩʂ-5େձͩ͊͊͊͋͋͋͋ʂʂʂ̍ʙ !QZBNB(.01FQBCP *OD ԶͷΛฉ͚ʂʂ-5େձ -JOVYίϚϯυͰϘτϧωοΫ ΛௐΔ
ϗεςΟϯάࣄۀ෦νʔϑςΫχΧϧϦʔυ ࢁԼ!QZBNB
ϖύϘԬ
αʔόαΠυɺϑϩϯτΤϯυɺ ΠϯϑϥΤϯδχΞશһདྷͯ͘Εʂʂʂʂ̍ ࠷৽ͷ࠾༻ใΛνΣοΫˠ !QC@SFDSVJU
Ϙτϧωο Ϋௐࠪ
ʮͳΜ͔Θ͔ΒΜ͚Ͳɺ Կ͔͕ͯ͘ ॲཧ͕ॏ͍ʯ
಄ѱͦ͏
ύϑΥʔϚϯεղੳʹ ͍͔ͭ͘ͷखஈ͕͋Δ
ͳΜ͔͍͍ͩͨͲͷձࣾʹ͍Δ͍͢͝ਓʹฉ͘ w͍͢͝ਓʹฉ͘ͱɺ͍͍ͩͨղܾͯ͘͠ΕΔ w͍͢͝ਓ͍͢͝ͷͰɺͦͷͰΘ͔Βͳͯ͘ɺ͍͍ͩͨ࣍ͷʹ ʮࡢͷ͋ΕΘ͔ͬͨΑʂʂʂʯͱ͔ௐ͖ͯͯ͘ΕΔ w͍͢͝ਓʹฉ͘ͱɺ͍͢͝ਓ͕ؤுΔ͚ͩͰɺ͕ࣗؤுΒͳ͍͔Β ͕ࣗ͠ͳ͍
ϓϩϑΝΠϦϯά wIUUQTHJUIVCDPNUNNTUBDLQSPG ݴޠ໊ϓϩϑΝΠϥ<ݕࡧ>
-JOVYͷίϚϯυͰௐΔ wHEC5IF(/6%FCVHHFS wTUSBDF5SBDFTZTUFNDBMMTBOETJHOBMT wQFSG1FSGPSNBODFBOBMZTJTUPPMTGPS-JOVY wWBMHSJOEBTVJUFPGUPPMTGPSEFCVHHJOHBOEQSPpMJOHQSPHSBNT
ࣄྫ
NSVCZͷ"1*ΞΫηε͕ NSVCZ DMJFOU "1*4FSWFS SFTPVSDFFYBNQMF NSVCZͷ$MJFOU͔Β͋Δ"1*Λ࣮ߦͯ͠ .#ͷϨεϙϯεΛऔಘ͢Δ߹ +40/
ࣄྫ ॠؒతʹ(CZUF͘Β͍ ϝϞϦ͏
WBMHSJOEͰϝϞϦͷΞϩέʔγϣϯΛݟΔ # valgrind curl http://localhost/resource/example > /dev/null … ==18619== HEAP
SUMMARY: ==18619== in use at exit: 0 bytes in 0 blocks ==18619== total heap usage: 1,863 allocs, 1,863 frees, 211,125 bytes allocated # valgrind /home/pyama/mruby test.rb … ==12811== HEAP SUMMARY: ==12811== in use at exit: 0 bytes in 0 blocks ==12811== total heap usage: 51,721 allocs, 51,721 frees, 12,028,345,116 bytes allocated
ʗ ?P? ʘ(
TUSBDFͰγεςϜίʔϧͷ౷ܭΛऔΔ # strace -fc /home/pyama/mruby test.rb % time seconds usecs/call
calls errors syscall ------ ----------- ----------- --------- --------- ---------------- 73.00 0.006317 2 3361 munmap 23.27 0.002014 11 183 brk 2.62 0.000227 0 1734 read 1.11 0.000096 0 3380 mmap 0.00 0.000000 0 3 write 0.00 0.000000 0 16 open 0.00 0.000000 0 23 close NVONBQ͕ࢧత IUUQTMJOVYKNPTEOKQIUNM-%1@NBOQBHFTNBONNBQIUNM
QFSGΛར༻ͯ͠ίʔϧάϥϑΛऔಘ͢Δ IUUQNSVCZPSHEPDTBQJIFBEFSTNSVCZ@'TUSJOHIIUNMNSC@TUS@QMVTGVODUJPO # perf record --call-graph dwarf -- /home/pyama/mruby test.rb
# perf report -g -G —stdio 94.35% 0.03% mruby mruby [.] mrb_str_plus | ---mrb_str_plus | --20.06%-- mrb_vm_exec mrb_vm_run … NSC@TUS@QMVT͕ࢧత
ใ͔ΒԾઆΛཱͯΔ wॲཧ)551ϦΫΤετͰϨεϙϯεϘσΟαΠζ͕େ͖͍ wϝϞϦ(#ͬͯΔΦϫλ wNVONBQ͕ࢧతͰճଟ͍͜ͱ͔ΒɺϝϞϦͷ֬อɺղ์͕ଟ ͍ͷͰͳ͍͔ʁ wNSC@TUS@QMVT͕ࢧతͰ͋Δ͜ͱ͔Βɺจࣈྻ݁߹͕ଟ͍͜ͱ͕ݪ ҼͬΆ͍ͳʁ NSC@TUS@QMVTSVCZFbDlBz lCz`
ΧΫΧΫ γΧδΧ
ݪҼ)551ϦΫΤετͷόοϑΝαΠζ IUUQTHJUIVCDPNNBUTVNPUPSZNSVCZTJNQMFIUUQQVMM NSVCZ DMJFOU "1*4FSWFS SFTPVSDFFYBNQMF +40/ ιέοτ͔Β+40/Λड͚औΔࡍͷόοϑΝαΠζ͕CZUFͰ͋ͬͨ͜ͱ͔Βɺ ಡࠐͷϧʔϓճ͕ଟ͘ͳ͍ͬͯͨɻόοϑΝͷαΠζΛCZUFมߋ͢Δ͜ͱͰ ݁Ռͱͯ͠ϧʔϓճΛݮΒͯ͠จࣈྻ݁߹ͷճΛݮΒͨ͠
NSVCZTJNQMFIUUQ while (t = socket.read(1024)) if block_given? yield t next
end ɹ #όοϑΝ͕গͳ͍ͱϧʔϓճ͕૿͑ͯɺ݁߹ճ͕૿͑ͯແବʹϝϞϦ֬อ response_text += t end ͔͠ɺ($͕Δ·Ͱ։์͞Εͳ͍
͏Ұา ౿ΈࠐΉ
NSC@TUS@QMVT NSVCZͰจࣈྻ݁߹ͷࡍʹ݁߹݁Ռจࣈྻͷ ϝϞϦΛ֬อ͢Δ
NSVCZTJNQMFIUUQ while (t = socket.read(1024)) if block_given? yield t next
end response_text << t end ͞ΒʹDPODBUʹ͢Δ͜ͱͰɺແବͳྖҬ֬อΛΊΔ
NSC@TUS@QMVT74NSC@TUS@DBU TUSJOHlBCz TUSJOHlBz TUSJOHlCz TUSJOHlBz TUSJOHlCz TUSJOHlBz TUSJOHlCz
TUSJOHlBCz
IUUQTUFOTOBQPODPNBSDIJWFT
·ͱΊ wϓϩϑΝΠϥίϚϯυΛར༻ͯ͠ใΛूΊΑ͏ wूΊͨใ͔ΒԾઆΛཱͯΑ͏ wԾઆΛݕূ͠Α͏ wσόοάίʔυͰ͋Ε͜Εࢼ͢ wਂ͘ίʔυΛಡΉɺ࣮ʹഭΔ
5IBOLZPV ࠷৽ͷ࠾༻ใΛνΣοΫˠ !QC@SFDSVJU