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ISUCON初参加で何もできなかった話 / do_nothing_at_isucon

Takeshi Kondo
September 20, 2018

ISUCON初参加で何もできなかった話 / do_nothing_at_isucon

isucon#8参加記録

Takeshi Kondo

September 20, 2018
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  1. 3FHVMBUJPO w ΞϓϦέʔγϣϯͷύϑΥʔϚϯεվળ w ෳ਺ݴޠͰ࣮૷͕༻ҙ͞Ε͍ͯΔ w Πϯϑϥ͸714্ͷ7. w ओ࠵͕༻ҙͨ͠ϕϯνϚʔΫࢼݧͷ఺਺Ͱڝ͏ w

    )5.-ͷ%0.ߏ଄ͷมߋ͸ېࢭ w ֎෦Ϧιʔεͷ࢖༻͸ېࢭ w ڝٕ࣌ؒ࣌ؒ͸࣌ʙ࣌ͷ࣌ؒ w ࠷ޙͷϕϯνϚʔΫͷ఺਺͕࠾༻͞ΕΔ http://isucon.net/archives/52445389.html
  2. ౰೔ w σΟεϓϨΠ΍ςʔϒϧɺిݯͳͲ෺ཧ४උ w  w ߏ੒೺ѲɺTTILFZϩάΠϯ֬ೝɺ࣮૷೺Ѳɺϕϯν ϚʔΫ࣮ࢪɺHJU؅ཧԽɺSFMFBTFTDSJQU࡞੒FUD w ͓ன

    w ؂ࢹMPHHJOHઃఆ௥ՃɺϘτϧωοΫ਍அ w ࢄาˍίʔώʔϒϨΠΫ☕ w "QQվળ w ࠷ऴௐ੔࠶ىಈࢼݧ
  3. Πϯϑϥߏ੒ JTVDPOB$FOU04 JTVDPOC$FOU04 JTVDPOD$FOU04 )0 )0 )0 #FODI.BSLFS (MPCBM*1 (MPCBM*1

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  4. ΞϓϦߏ੒ w Πϕϯτ؅ཧαΠτ w ओ࠵ऀ͸ΠϕϯτΛ࡞੒Ͱ͖Δ w ϕʔεՁ֨Λܾఆ͠ɺ   

     ͱ࠲੮ϥ ϯΫʹΑͬͯՁ͕֨ҟͳΔ w ར༻ऀ͸ΠϕϯτΛ༧໿ͨ͠ΓɺΩϟϯηϧͨ͠Γ Ͱ͖Δ
  5. ͦ΋ͦ΋*46$0/߈ུͷఆੴ͸ʁ w ҆શʹมߋΛՃ͑Δ४උ HJU؅ཧSFMFBTFTDSJQU  w Πϯϑϥͷߏ੒Λ೺Ѳ͢Δ w ΞϓϦͷϩδοΫΛ೺Ѳ͢Δ w

    ϕϯνϚʔΫͷ)551ϦΫΤετ಺༰Λ೺Ѳ w ϘτϧωοΫΛಛఆ w վળ ͜͜·Ͱ͸Ͱ͖ͨ RubyͱɺSQLͷཧղ଎౓ෆ଍ ͦΕΒ͍͠஗͍Query͸Θ͔Δ͕ɺ ͲΕ͕ϕϯνϚʔΫʹޮ͔͘Θ͔Βͳ͍
  6. ͳͥԿ΋Ͱ͖ͳ͔ͬͨͷ͔ w 8FC%FWFMPQFSͷਓʹΞϓϦΛ·͔ͤɺΠϯϑϥ໘Ͱ ߩݙ͠Α͏ͱͨ͠ w Α͘஌Βͳ͍΋ͷ )0 Ͱෛՙ෼ࢄΛ͠Α͏ͱͨ͠ w FUDIPTUTͰ%/4Ͱ΍Ε͹Α͔ͬͨΆ͍

    ࢥ͍͔ͭͣ  w ܦݧͷ͋ΔOHJOY΍IBQSPYZʹೖΕସ͑Δ΂͖ͩͬͨ w 42-&91-"*/ޙͷΞΫγϣϯ͕औΕͳ͍ ஌ࣝෆ଍  w %BUB%PHྗෆ଍ 43&ͱͯ͠Ϡό͍  w ϕϯνϚʔΫ͸୹࣮࣌ؒߦͳͷͰɺՄࢹԽ͕೉͍͠ w IUPQͰோΊΔ΄͏͕ଥ౰
  7. Ͳ͏͢΂͖ͩͬͨͷ͔ w ఢΛ஌ΔʹϕϯνϚʔΫΛ஌Δ w ϕϯνϚʔΫͷJOJUॲཧͷཧղʹ࣌ؒΛ͔͚Δ΂͖ w JOJUॲཧ͕MPDBMIPTUͷ%BUBCBTFʹରͯ͠૸͍ͬͯͨ w ͦͷͨΊ%#ͷ޲͖ઌΛ੾Γସ͑Δͱࣦഊͨ͠ w

    BQQTFSWFSͷෛՙ෼ࢄΛ࠷༏ઌ͢΂͖ w ࠓճ͸QVNBʹΑͬͯϝϞϦ͕ރׇ͍ͯͨ͠ w QBUIʹΑͬͯQSPYZઌΛม͑ΔͳͲͯ͠ॏ͍ॲཧͱɺ ͦ͏Ͱͳ͍ॲཧΛ෼͚Δͱ͍͏͜ͱ͕Ͱ͖ͨ͸ͣ
  8. ݶΒΕͨ࣌ؒͰྗΛൃش͢ΔͨΊʹ͸ w ೔ࠒ͔Βπʔϧ ٕज़ Λखʹͳ͡·͓ͤͯ͘͜ͱ w ܭଌπʔϧɺղੳπʔϧ w ఆ൪044 w

    खʹͳ͡Μٕͩज़Ͱ࠷ߴͷύϑΥʔϚϯεΛൃش͢Δ w ೔ʑͷΩϟονΞοϓˍτϨʔχϯά͕େࣄʜ w ΊͬͪΌ౰ͨΓલͷ݁࿦
  9. ༧બ௨աνʔϜͱͷҧ͍ w ࣄલ४උෆ଍ w ໾ׂ෼୲ w ఆੴͷܭଌํ๏ɺܭଌޙͷΞΫγϣϯ͕͋Δ͸ͣ w ٕज़ྗෆ଍ w

    42-ΫΤϦͷಡղྗ w *OEFYͷ࢓૊Έͱ&91-"*/ͷ࢖͍ํ w σʔλϕʔεͷੑೳࢦඪͷݟํ w ߏ੒มߋΛߦ͏༐ؾͱखࡳ