{"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\/fr\/blog\/news\/proekt-po-dobavleniyu-v-gcc-podderzhki-rasparallelivaniya-protsessa-kompilyatsii","title":{"rendered":"Projet d'ajout dans GCC du support de la parall\u00e9lisation du processus de compilation","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Dans le cadre d'un projet de recherche GCC parall\u00e8le<\/a><\/noindex> le travail a commenc\u00e9 pour ajouter \u00e0 GCC la capacit\u00e9 de diviser le processus de compilation en plusieurs threads ex\u00e9cut\u00e9s en parall\u00e8le. Actuellement, pour am\u00e9liorer la vitesse de compilation sur des syst\u00e8mes multic\u0153urs, il est utilis\u00e9 un lancement de processus de compilateur distincts au niveau de l'outil make, chacun d'eux effectuant la compilation d'un fichier de code distinct. Le nouveau projet exp\u00e9rimente la parall\u00e9lisation au niveau du compilateur, ce qui pourrait potentiellement am\u00e9liorer l'efficacit\u00e9 de fonctionnement sur des syst\u00e8mes multic\u0153urs. <\/p>\n

Pour les tests pr\u00e9par\u00e9e<\/a><\/noindex> une branche de parall\u00e9lisation distincte de GCC, pour laquelle un nouveau param\u00e8tre a \u00e9t\u00e9 propos\u00e9 afin de d\u00e9finir le nombre de threads «—param=num-threads=N». Au d\u00e9part, des optimisations inter-proc\u00e9durales ont \u00e9t\u00e9 s\u00e9par\u00e9es dans des threads d'ex\u00e9cution distincts, appel\u00e9es de mani\u00e8re cyclique pour chaque fonction et qui se pr\u00eatent bien au parall\u00e9lisme. Les op\u00e9rations GIMPLE responsables des optimisations ind\u00e9pendantes du mat\u00e9riel, qui \u00e9valuent les interactions entre les fonctions, ont \u00e9t\u00e9 d\u00e9plac\u00e9es dans des threads distincts.<\/p>\n

Au stade suivant, il est \u00e9galement pr\u00e9vu de d\u00e9placer dans des threads distincts les optimisations RTL interproc\u00e9durales, prenant en compte les sp\u00e9cificit\u00e9s de la plateforme mat\u00e9rielle. Ensuite, il est pr\u00e9vu de r\u00e9aliser la parall\u00e9lisation des optimisations intraprocedurales (IPA) appliqu\u00e9es au code \u00e0 l'int\u00e9rieur de la fonction, ind\u00e9pendamment des caract\u00e9ristiques de l'appel. La limitation actuelle est le ramasse-miettes, auquel une verrouillage global a \u00e9t\u00e9 ajout\u00e9, d\u00e9sactivant les op\u00e9rations de ramassage pendant l'ex\u00e9cution en mode multithread (\u00e0 l'avenir, le ramasse-miettes sera adapt\u00e9 \u00e0 l'ex\u00e9cution multithread de GCC).<\/p>\n

Pour \u00e9valuer le changement de performance, un ensemble de tests a \u00e9t\u00e9 pr\u00e9par\u00e9, qui compile le fichier gimple-match.c, contenant plus de 100 000 lignes de code et 1700 fonctions. Les tests sur un syst\u00e8me avec un CPU Intel Core i5-8250U avec 4 c\u0153urs physiques et 8 virtuels (Hyperthreading) ont montr\u00e9 une r\u00e9duction du temps d'ex\u00e9cution des optimisations intra proc\u00e9durales GIMPLE de 7 \u00e0 4 secondes lors de l'ex\u00e9cution de 2 threads et \u00e0 3 secondes lors de l'ex\u00e9cution de 4 threads, soit une augmentation de la vitesse de la phase consid\u00e9r\u00e9e de compilation de 1,72 et 2,52 fois, respectivement. Les tests ont \u00e9galement montr\u00e9 que l'utilisation de c\u0153urs virtuels lors de l'Hyperthreading n'entra\u00eene pas d'augmentation de performance. <\/p>\n

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

Le temps de compilation a \u00e9t\u00e9 r\u00e9duit d'environ 10 %, mais selon les pr\u00e9visions, le parall\u00e9lisme des optimisations RTL permettra d'obtenir des r\u00e9sultats plus significatifs, car cette \u00e9tape prend beaucoup plus de temps lors de la compilation. Approximativement, apr\u00e8s le parall\u00e9lisme RTL, le temps de compilation devrait \u00eatre r\u00e9duit d'un facteur de 1,61. Par la suite, il sera encore possible de r\u00e9duire le temps de compilation de 5 \u00e0 10 % gr\u00e2ce au parall\u00e9lisme des optimisations IPA.<\/p>\n

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

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

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

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