{"id":93424,"date":"2020-09-07T07:42:06","date_gmt":"2020-09-07T05:42:06","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/proekt-gentoo-predstavil-sistemu-upravleniya-paketami-portage-3-0"},"modified":"2020-09-07T07:42:06","modified_gmt":"2020-09-07T05:42:06","slug":"proekt-gentoo-predstavil-sistemu-upravleniya-paketami-portage-3-0","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pl\/blog\/news\/proekt-gentoo-predstavil-sistemu-upravleniya-paketami-portage-3-0","title":{"rendered":"Projekt Gentoo zaprezentowa\u0142 system zarz\u0105dzania pakietami Portage 3.0","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Zosta\u0142 ustabilizowany<\/a><\/noindex> wydanie systemu zarz\u0105dzania pakietami Portage 3.0<\/a><\/noindex>, u\u017cywane w dystrybucji Gentoo Linux<\/a><\/noindex>. Przedstawiona ga\u0142\u0105\u017a podsumowuje d\u0142ugotrwa\u0142\u0105 prac\u0119 nad przej\u015bciem na Pythona 3 oraz zako\u0144czeniem wsparcia dla Pythona 2.7. <\/p>\n

Opr\u00f3cz zako\u0144czenia wsparcia dla Pythona 2.7, inn\u0105 wa\u017cn\u0105 zmian\u0105 by\u0142o w\u0142\u0105czenie optymalizacji<\/a><\/noindex>, kt\u00f3re pozwoli\u0142y przyspieszy\u0107 obliczenia zwi\u0105zane z rozwi\u0105zywaniem zale\u017cno\u015bci o 50-60%. Interesuj\u0105ce, \u017ce niekt\u00f3rzy deweloperzy proponowali przepisanie kodu rozwi\u0105zywania zale\u017cno\u015bci w C\/C++ lub Go, aby przyspieszy\u0107 jego dzia\u0142anie, ale uda\u0142o si\u0119 rozwi\u0105za\u0107 istniej\u0105cy problem wzgl\u0119dnie \u0142atwo.<\/p>\n

Profilowanie istniej\u0105cego kodu pokaza\u0142o, \u017ce g\u0142\u00f3wny czas oblicze\u0144 jest wykorzystywany na wywo\u0142ania funkcji use_reduce i catpkgsplit z powtarzaj\u0105cym si\u0119 zestawem argument\u00f3w (na przyk\u0142ad, funkcja catpkgsplit by\u0142a wywo\u0142ywana od 1 do 5 mln razy). Aby przyspieszy\u0107 dzia\u0142anie, zastosowano cachowanie wynik\u00f3w tych funkcji z u\u017cyciem s\u0142ownik\u00f3w. Optymaln\u0105 metod\u0105 do przechowywania tego cache'a by\u0142a wbudowana funkcja lru_cache, dost\u0119pna tylko w wersjach Pythona od 3.2. Aby zapewni\u0107 kompatybilno\u015b\u0107 z wcze\u015bniejszymi wersjami, dodano zamiennik lru_cache, ale decyzja o zako\u0144czeniu wsparcia dla Pythona 2.7 w Portage 3.0 znacznie upro\u015bci\u0142a zadanie i pozwoli\u0142a obej\u015b\u0107 si\u0119 bez tego po\u015brednika. <\/p>\n

Zastosowanie pami\u0119ci podr\u0119cznej pozwoli\u0142o skr\u00f3ci\u0107 czas wykonania operacji «emerge -uDvpU —with-bdeps=y @world» na laptopie ThinkPad X220 z 5 minut 20 sekund do 3 minut 16 sekund (63%). Testy na innych systemach wykaza\u0142y wzrost wydajno\u015bci nie mniejszy ni\u017c 48%.<\/p>\n

Deweloper przygotowuj\u0105cy t\u0119 zmian\u0119 pr\u00f3bowa\u0142 r\u00f3wnie\u017c zaimplementowa\u0107 prototyp kodu rozwi\u0105zywania zale\u017cno\u015bci w C++ lub Rust, ale zadanie okaza\u0142o si\u0119 zbyt skomplikowane, poniewa\u017c wymaga\u0142o portowania du\u017cej ilo\u015bci kodu, a tak\u017ce w\u0105tpliwe by\u0142o, \u017ce osi\u0105gni\u0119ty wynik by\u0142by wart poniesionych wysi\u0142k\u00f3w. <\/p>\n

<\/a><\/noindex><\/p>\n

\u0179r\u00f3d\u0142o: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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