{"id":38137,"date":"2019-10-31T22:21:53","date_gmt":"2019-10-31T19:21:53","guid":{"rendered":"https:\/\/prohoster.info\/blog\/proekt-po-dobavleniyu-v-gcc-podderzhki-rasparallelivaniya-protsessa-kompilyatsii\/"},"modified":"2019-10-31T22:21:53","modified_gmt":"2019-10-31T19:21:53","slug":"proekt-po-dobavleniyu-v-gcc-podderzhki-rasparallelivaniya-protsessa-kompilyatsii","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/proekt-po-dobavleniyu-v-gcc-podderzhki-rasparallelivaniya-protsessa-kompilyatsii","title":{"rendered":"Projeto para adicionar suporte \u00e0 paraleliza\u00e7\u00e3o do processo de compila\u00e7\u00e3o no GCC","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

No \u00e2mbito do projeto de pesquisa Parallel GCC<\/a><\/noindex> come\u00e7ou o trabalho para adicionar ao GCC uma funcionalidade que permite dividir o processo de compila\u00e7\u00e3o em v\u00e1rios threads executados em paralelo. Atualmente, para aumentar a velocidade de compila\u00e7\u00e3o em sistemas multin\u00facleo, a n\u00edvel da utilidade make, s\u00e3o lan\u00e7ados processos separados do compilador, cada um deles respons\u00e1vel pela compila\u00e7\u00e3o de um arquivo de c\u00f3digo separado. O novo projeto experimenta a paraleliza\u00e7\u00e3o a n\u00edvel do compilador, o que potencialmente permitir\u00e1 aumentar a efici\u00eancia em sistemas multin\u00facleo. <\/p>\n

Para testes preparada<\/a><\/noindex> uma ramifica\u00e7\u00e3o separada para paraleliza\u00e7\u00e3o do GCC, na qual foi proposto um novo par\u00e2metro «—param=num-threads=N» para definir o n\u00famero de threads. Na fase inicial, foram implementadas otimiza\u00e7\u00f5es interprocedimentais em threads separadas, que s\u00e3o invocadas ciclicamente para cada fun\u00e7\u00e3o e se prestam bem \u00e0 paraleliza\u00e7\u00e3o. Opera\u00e7\u00f5es GIMPLE, respons\u00e1veis por otimiza\u00e7\u00f5es independentes de hardware que avaliam a intera\u00e7\u00e3o entre fun\u00e7\u00f5es, foram movidas para threads separadas.<\/p>\n

Na pr\u00f3xima etapa, tamb\u00e9m est\u00e1 previsto extrair para threads separadas as otimiza\u00e7\u00f5es RTL interprocedurais, que consideram as caracter\u00edsticas da plataforma de hardware. Ap\u00f3s isso, planeja-se implementar a paraleliza\u00e7\u00e3o das otimiza\u00e7\u00f5es intraprocedurais (IPA), aplic\u00e1veis ao c\u00f3digo dentro da fun\u00e7\u00e3o, independentemente das particularidades da chamada. O elo limitante at\u00e9 agora \u00e9 o coletor de lixo, que foi adicionado com um bloqueio global, desativando as opera\u00e7\u00f5es de coleta de lixo durante a execu\u00e7\u00e3o em modo multithread (no futuro, o coletor de lixo ser\u00e1 adaptado para a execu\u00e7\u00e3o multithread do GCC).<\/p>\n

Para avaliar a mudan\u00e7a de desempenho, um conjunto de testes foi preparado, realizando a compila\u00e7\u00e3o do arquivo gimple-match.c, que inclui mais de 100 mil linhas de c\u00f3digo e 1700 fun\u00e7\u00f5es. Os testes em um sistema com CPU Intel Core i5-8250U com 4 n\u00facleos f\u00edsicos e 8 virtuais (Hyperthreading) mostraram uma redu\u00e7\u00e3o no tempo de execu\u00e7\u00e3o das otimiza\u00e7\u00f5es Intra Procedural GIMPLE de 7 para 4 segundos ao executar 2 threads e para 3 segundos ao executar 4 threads, ou seja, um aumento na velocidade da fase de compila\u00e7\u00e3o considerada de 1.72 e 2.52 vezes, respectivamente. Os testes tamb\u00e9m mostraram que o uso de n\u00facleos virtuais durante o Hyperthreading n\u00e3o resulta em aumento de desempenho. <\/p>\n

\"Projeto<\/center><\/p>\n

O tempo total de compila\u00e7\u00e3o diminuiu aproximadamente em 10%, mas as previs\u00f5es indicam que a paraleliza\u00e7\u00e3o das otimiza\u00e7\u00f5es RTL permitir\u00e1 resultados mais significativos, j\u00e1 que essa fase leva consideravelmente mais tempo durante a compila\u00e7\u00e3o. Estima-se que, ap\u00f3s a paraleliza\u00e7\u00e3o do RTL, o tempo total de compila\u00e7\u00e3o ser\u00e1 reduzido em 1,61 vezes. Al\u00e9m disso, ser\u00e1 poss\u00edvel reduzir o tempo de compila\u00e7\u00e3o em mais 5-10% por meio da paraleliza\u00e7\u00e3o das otimiza\u00e7\u00f5es IPA.<\/p>\n

\"Projeto<\/center><\/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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