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PyQͰ͡ΊΔPython
Pythonೖऀͷू͍ #6 2018/01/16 - Ozawa Shuhei ( @oza_shu ) 1
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ࣗݾհ
— খपฏ
— @oza_shu
— MSPۀք WEBαʔϏεͷαʔόӡ༻
Pythonೖऀͷू͍ #6 2018/01/16 - Ozawa Shuhei ( @oza_shu ) 2
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PyQͱ
— ࣸܦϕʔεͰ՝Λղ͍֮ͯ͑Δ
— աڈͷ՝Ͱशͬͨจ๏෮ֶͯ͠शͰ͖Δ
— ֶशΧϨϯμʔ͕Ͱ͖ͨ
Pythonೖऀͷू͍ #6 2018/01/16 - Ozawa Shuhei ( @oza_shu ) 3
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ֶशͰ͖Δ༰
— جຊతͳจ๏
— WebΞϓϦ(Django)
— σʔλॲཧ(pandas)
— ػցֶश
Pythonೖऀͷू͍ #6 2018/01/16 - Ozawa Shuhei ( @oza_shu ) 4
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PythonͰLinuxαʔόͱྑ͘ͳΔ
— ΞϓϦΛಈ͔͍ͯ͠Δϓϩηεʹ͍ͭͯͬͱΓ͍ͨ
— Ͳ͏ͬͯΞϓϦʹΞΫηε͍ͯ͠Δͷ͔Γ͍ͨ
Pythonೖऀͷू͍ #6 2018/01/16 - Ozawa Shuhei ( @oza_shu ) 5
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ΞϓϦΛಈ͔͍ͯ͠Δϓϩηεʹ͍ͭͯͬͱΓ͍ͨ
— OSϓϩηεΛɺϓϩηεʹׂΓৼΒΕͨPIDΛΈͯ
ͱͯ͠ѻ͏
— ϓϩηε͕։͍ͨϑΝΠϧʹϑΝΠϧσΟεΫϦϓλׂ͕
ΓͯΒΕΔ
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ίʔυྫ(1) PIDΛΈͯΈΑ͏
# ݱࡏͷϓϩηεΛฦ͢
import os
print ("My pid:", os.getpid())
$ python3 3_processes_have_pid.py
My pid: 10592
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psίϚϯυͰ֬ೝͰ͖Δ
ps aux |grep zsh
USER PID %CPU %MEM VSZ RSS TT STAT STARTED TIME COMMAND
root 74749 0.0 0.0 4296948 3016 s005 Ss 2:39AM 0:00.11 -zsh
root 73439 0.0 0.0 4296948 3028 s003 Ss 2:19AM 0:00.11 -zsh
root 63923 0.0 0.0 4296948 2980 s001 Ss+ 11:15PM 0:00.10 -zsh
PID͔ΒSWAP༻ྔ͕ଟ͍ϓϩηεΛಛఆ
$ grep VmSwap /proc/*/status |sort -k2 -r |head -n
/proc/2121/status:VmSwap: 158284 kB
/proc/16520/status:VmSwap: 154516 kB
/proc/18192/status:VmSwap: 141116 kB
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ίʔυྫ(2) ϑΝΠϧσΟεΫϦϓλ
# ϑΝΠϧσΟεΫϦϓλׂ͕ΓͯΒΕ͍ͯΔ͔ΈͯΈΑ͏
if __name__ == "__main__":
with open("/etc/passwd") as passwd:
print(passwd.fileno())
# ϑΝΠϧΛด͡Δͱফ͑Δ
$ python3 file_descriptors.py
3
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ಛผͳϑΝΠϧσΟεΫϦϓλ
— ඪ४ೖྗ → 0
— ඪ४ग़ྗ → 1
— ඪ४Τϥʔग़ྗ → 2
>>> sys.stdin.fileno()
0
>>> sys.stdout.fileno()
1
>>> sys.stderr.fileno()
2
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ᐆດͩͬͨॻ͖ํΛཧղͰ͖ΔΑ͏ʹͳͬͨ
!
command >/dev/null 2>&1
!
command 2>&1 >/dev/null
Pythonೖऀͷू͍ #6 2018/01/16 - Ozawa Shuhei ( @oza_shu ) 11
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fork()ؾʹͳͬͯ͘Δ
ϓϩηε͕Fork͞ΕΔͬͯͲ͏͍͏͜ͱ͚ͩͬ?
ࢠϓϩηεϓϩηεͰΘΕ͍ͯΔશͯͷϝϞϦͷίϐʔΛҾ͖ܧ͙
ϑΝΠϧσΟεΫϦϓλ(ιέοτ)
— socket,osϞδϡʔϧͳͲͰpreforkαʔόॻ͚Δ
— ίϐʔɾΦϯɾϥΠτʢCoWɺCopy on Writeʣ
— ԿͰκϯϏϓϩηεͬͯͳΔΜ͚ͩͬ
— ϓϩηεؒ௨৴
— ύΠϓॲཧ,ετϦʔϜ,ϝοηʔδ
— γάφϧॲཧ
— ϓϩηεάϧʔϓ,ηογϣϯάϧʔϓ
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·ͱΊ
— PyQࣸܦΛ௨ͯ͠ͷֶशͳͷͰɺϓϩάϥϛϯάॳΊͨ
͔ΓͷਓʹΑͦ͞͏
— PythonΛ௨ͯ͡Linuxͱྑ͘ͳΕΔ
— ϓϩηε͕Ͳ͏࣮ߦ͞Ε͍ͯΔͷ͔ͪΌΜͱཧղ͢Δॿ͚
ʹͳΔ
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