{"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\/pt\/blog\/news\/proekt-gentoo-predstavil-sistemu-upravleniya-paketami-portage-3-0","title":{"rendered":"O projeto Gentoo apresentou o sistema de gerenciamento de pacotes Portage 3.0","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Estabilizado<\/a><\/noindex> lan\u00e7amento do sistema de gerenciamento de pacotes Portage 3.0<\/a><\/noindex>, aplicada na distribui\u00e7\u00e3o Gentoo Linux<\/a><\/noindex>. Este ramo concluiu um longo trabalho de transi\u00e7\u00e3o para o Python 3 e a descontinua\u00e7\u00e3o do suporte ao Python 2.7. <\/p>\n

Al\u00e9m da descontinua\u00e7\u00e3o do suporte ao Python 2.7, outra mudan\u00e7a importante foi a inclus\u00e3o de otimiza\u00e7\u00f5es<\/a><\/noindex>, que permitiram acelerar em 50-60% os c\u00e1lculos relacionados \u00e0 defini\u00e7\u00e3o de depend\u00eancias. Curiosamente, alguns desenvolvedores sugeriram reescrever o c\u00f3digo de resolu\u00e7\u00e3o de depend\u00eancias em C\/C++ ou Go para acelerar seu funcionamento, mas a quest\u00e3o foi resolvida de forma mais simples.<\/p>\n

A realiza\u00e7\u00e3o de um perfilamento do c\u00f3digo existente mostrou que a maior parte do tempo durante os c\u00e1lculos era gasta na chamada das fun\u00e7\u00f5es use_reduce e catpkgsplit com um conjunto repetido de argumentos (por exemplo, a fun\u00e7\u00e3o catpkgsplit foi chamada de 1 a 5 milh\u00f5es de vezes). Para acelerar, foi aplicado um cache dos resultados dessas fun\u00e7\u00f5es utilizando dicion\u00e1rios. A fun\u00e7\u00e3o incorporada lru_cache foi considerada ideal para armazenar o cache, mas estava dispon\u00edvel apenas nas vers\u00f5es do Python a partir da 3.2. Para compatibilidade com vers\u00f5es anteriores, foi adicionada uma implementa\u00e7\u00e3o alternativa que substitu\u00eda o lru_cache, mas a decis\u00e3o de descontinuar o suporte ao Python 2.7 no Portage 3.0 simplificou bastante a tarefa e eliminou a necessidade dessa camada adicional. <\/p>\n

O uso de cache permitiu reduzir o tempo de execu\u00e7\u00e3o da opera\u00e7\u00e3o «emerge -uDvpU —with-bdeps=y @world» em um notebook ThinkPad X220 de 5 minutos e 20 segundos para 3 minutos e 16 segundos (63%). Testes em outros sistemas mostraram um aumento de desempenho de pelo menos 48%.<\/p>\n

O desenvolvedor que preparou a altera\u00e7\u00e3o tamb\u00e9m tentou implementar um prot\u00f3tipo do c\u00f3digo de resolu\u00e7\u00e3o de depend\u00eancias em C++ ou Rust, mas a tarefa se revelou muito complexa, pois exigia a portabilidade de um grande volume de c\u00f3digo, e, al\u00e9m disso, era duvidoso que o resultado justificasse o esfor\u00e7o investido. <\/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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