la parall\u00e9lisation des calculs, permet d’exploiter au maximum les capacit\u00e9 calculatoire de votre ordinateur en utilisant tous les core de votre machine ( dual core , quad core …)
Cette facpon de proceder est rentable si le calcul que vous voulez faire prend plus de temps que le fait de mettre en place la parall\u00e9lisation<\/p>\n
library(foreach)
library(doSNOW)\n\ngetDoParWorkers()\n\nregisterDoSNOW(makeCluster(4, type = \"SOCK\"))# 2 , 4 ou plus en fonction de votre machine\n\ngetDoParWorkers()\n\nN <- 10^4\n\nsystem.time(foreach(i = 1:N,.combine = \"cbind\") %do% {sum(rnorm(N))})\n\nsystem.time(foreach(i = 1:N,.combine = \"cbind\") %dopar% {sum(rnorm(N))})<\/p>
<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
la parall\u00e9lisation des calculs, permet d’exploiter au maximum les capacit\u00e9 calculatoire de votre ordinateur en utilisant tous les core de votre machine ( dual core , quad core …)Cette facpon de proceder est rentable si le calcul que vous voulez faire prend plus de temps que le fait de mettre en place la parall\u00e9lisation library(foreach)library(doSNOW) getDoParWorkers() registerDoSNOW(makeCluster(4, type = \u00ab\u00a0SOCK\u00a0\u00bb))# 2 , 4 ou plus en fonction de votre machine getDoParWorkers() N <- 10^4 system.time(foreach(i = 1:N,.combine = \u00ab\u00a0cbind\u00a0\u00bb) %do% {sum(rnorm(N))}) system.time(foreach(i = 1:N,.combine = \u00ab\u00a0cbind\u00a0\u00bb) %dopar% {sum(rnorm(N))})Read More →<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","rop_custom_images_group":[],"rop_custom_messages_group":[],"rop_publish_now":"initial","rop_publish_now_accounts":{"twitter_399453572_399453572":""},"rop_publish_now_history":[],"rop_publish_now_status":"pending","jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[2,8,18],"tags":[],"class_list":{"0":"entry","1":"post","2":"publish","3":"author-vincent","4":"post-3005","6":"format-standard","7":"category-algorithmique","8":"category-fonctions-utiles","9":"category-programmer-avec-r"},"acf":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p9O7Sx-Mt","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/thinkr.fr\/abcdr\/wp-json\/wp\/v2\/posts\/3005","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/thinkr.fr\/abcdr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/thinkr.fr\/abcdr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/thinkr.fr\/abcdr\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/thinkr.fr\/abcdr\/wp-json\/wp\/v2\/comments?post=3005"}],"version-history":[{"count":2,"href":"https:\/\/thinkr.fr\/abcdr\/wp-json\/wp\/v2\/posts\/3005\/revisions"}],"predecessor-version":[{"id":4248,"href":"https:\/\/thinkr.fr\/abcdr\/wp-json\/wp\/v2\/posts\/3005\/revisions\/4248"}],"wp:attachment":[{"href":"https:\/\/thinkr.fr\/abcdr\/wp-json\/wp\/v2\/media?parent=3005"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/thinkr.fr\/abcdr\/wp-json\/wp\/v2\/categories?post=3005"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/thinkr.fr\/abcdr\/wp-json\/wp\/v2\/tags?post=3005"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}