{"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\/it\/blog\/novosti-interneta\/proekt-gentoo-predstavil-sistemu-upravleniya-paketami-portage-3-0","title":{"rendered":"Il progetto Gentoo ha presentato il sistema di gestione pacchetti Portage 3.0","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Stabilizzato<\/a><\/noindex> l'uscita del sistema di gestione dei pacchetti Portage 3.0<\/a><\/noindex>, utilizzato nella distribuzione Gentoo Linux<\/a><\/noindex>. Questa versione conclude un lungo lavoro di transizione a Python 3 e la cessazione del supporto per Python 2.7. <\/p>\n

Oltre alla cessazione del supporto per Python 2.7, un'altra importante novit\u00e0 \u00e8 stata l'inclusione di ottimizzazioni<\/a><\/noindex>, che hanno consentito di aumentare la velocit\u00e0 dei calcoli relativi alla determinazione delle dipendenze del 50-60%. \u00c8 interessante notare che alcuni sviluppatori hanno proposto di riscrivere il codice di risoluzione delle dipendenze in C\/C++ o Go per accelerare le prestazioni, ma sono riusciti a risolvere il problema in modo relativamente semplice.<\/p>\n

La profilazione del codice esistente ha mostrato che il tempo principale durante i calcoli \u00e8 speso nelle chiamate delle funzioni use_reduce e catpkgsplit con un insieme ripetitivo di argomenti (ad esempio, la funzione catpkgsplit \u00e8 stata chiamata da 1 a 5 milioni di volte). Per migliorare la velocit\u00e0, \u00e8 stata applicata la memorizzazione dei risultati di queste funzioni utilizzando dizionari. La funzione integrata lru_cache si \u00e8 dimostrata ottimale per la memorizzazione della cache, ma era disponibile solo nelle versioni di Python a partire dalla 3.2. Per garantire la compatibilit\u00e0 con versioni precedenti, \u00e8 stata aggiunta una sostituzione per lru_cache, ma la decisione di interrompere il supporto per Python 2.7 in Portage 3.0 ha semplificato notevolmente la questione, consentendo di evitare questa interfaccia. <\/p>\n

L'uso della cache ha permesso di ridurre il tempo di esecuzione dell'operazione «emerge -uDvpU —with-bdeps=y @world» su un laptop ThinkPad X220 da 5 minuti e 20 secondi a 3 minuti e 16 secondi (63%). I test su altri sistemi hanno mostrato un incremento delle prestazioni non inferiore al 48%.<\/p>\n

Lo sviluppatore che ha preparato la modifica ha anche cercato di implementare un prototipo di codice per la risoluzione delle dipendenze in C++ o Rust, ma il compito si \u00e8 rivelato troppo complesso, poich\u00e9 richiedeva il porting di un grande volume di codice e, inoltre, era dubbio che il risultato ottenuto valesse gli sforzi impiegati. <\/p>\n

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

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

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La versione presentata riassume un lungo lavoro di transizione a Python 3 e di cessazione del supporto per Python 2.7. Oltre alla cessazione del supporto per Python 2.7, un'altra importante modifica \u00e8 stata l'inclusione di ottimizzazioni che hanno consentito di velocizzare del 50-60% i calcoli relativi alla determinazione delle dipendenze. \u00c8 interessante notare che alcuni sviluppatori hanno suggerito di riscrivere il codice.","canonical_url":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/proekt-gentoo-predstavil-sistemu-upravleniya-paketami-portage-3-0","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"it_IT","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u041f\u0440\u043e\u0435\u043a\u0442 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