{"id":1584,"date":"2009-07-27T22:32:42","date_gmt":"2009-07-27T20:32:42","guid":{"rendered":"http:\/\/www.ziserman.com\/blog\/?p=1584"},"modified":"2009-07-28T08:16:24","modified_gmt":"2009-07-28T06:16:24","slug":"le-gachis-phenomenal-de-puissance-des-systemes-interne","status":"publish","type":"post","link":"https:\/\/www.ziserman.com\/blog\/2009\/07\/27\/le-gachis-phenomenal-de-puissance-des-systemes-interne\/","title":{"rendered":"Le g\u00e2chis ph\u00e9nom\u00e9nal de puissance des syst\u00e8mes Internet"},"content":{"rendered":"<p>Quand on regarde se qui se passe, entre l&rsquo;envoie d&rsquo;une requ\u00eate par le navigateur et l&rsquo;affichage du r\u00e9sultat, on est frapp\u00e9 par l&rsquo;incroyable g\u00e2chis, \u00e0 tous les niveaux.<br \/>\n<strong>Incroyable \u00e0 un niveau difficile \u00e0 imaginer<\/strong>. Intuitivement, je dirais au moins 1000, mais la r\u00e9alit\u00e9 est sans doute bien plus \u00e9lev\u00e9e.<\/p>\n<p>1000 ? 1000 quoi ?<\/p>\n<p>1000, entre ce que ferait un syst\u00e8me avec des performances optimis\u00e9es, et ce qu&rsquo;on fait actuellement.<\/p>\n<p>Un exemple croustillant :<\/p>\n<p>La page \u00e0 afficher contient du Javascript.<br \/>\nCe javascript est envoy\u00e9 en texte sur le r\u00e9seau. Il prend donc une bande passante correspondante.<br \/>\nDe plus, il est bien souvent dans un fichier \u00e0 part. Cela veut dire un \u00e9change sp\u00e9cifique, entre le client et le serveur, pour ramener ce script sur le client.<br \/>\nBon, le script est l\u00e0&#8230;. Le navigateur doit analyser ce texte, caract\u00e8re par caract\u00e8re, pour transformer tout \u00e7a en un programme ex\u00e9cutable.<br \/>\nSi, \u00e0 la place, on avait un \u00ab\u00a0bytecode\u00a0\u00bb : un code binaire universel (comme le java par exemple, ou le flash), il y aurait, sur le client, une lecture incroyablement plus rapide, pour un code beaucoup plus l\u00e9ger.<\/p>\n<p>Des exemples comme celui l\u00e0, il y en a des dizaines, des centaines, qui s&rsquo;accumulent les uns aux autres&#8230;<\/p>\n<p><strong>C&rsquo;est toute la cha\u00eene Internet \/ Web qui est construite sans aucune r\u00e9flexion de performance, comme si les ressources \u00e9taient illimit\u00e9es<\/strong>.<\/p>\n<p>R\u00e9sultat, pour mettre en ligne des services, avec des temps de r\u00e9ponse raisonnable (moins d&rsquo;une seconde&#8230; une \u00e9ternit\u00e9 pour un ordinateur), on doit mettre en \u0153uvre des monstres de puissance : batterie de serveurs octo-processeurs, giga octet de Ram, syst\u00e8mes de cache, &#8230; Bref, un syst\u00e8me capable de performances hallucinantes&#8230; Tout \u00e7a pour servir quelques pages web \u00e0 la seconde&#8230; Pages qui ne comportent en g\u00e9n\u00e9ral aucune complexit\u00e9 au niveau des calculs&#8230;<\/p>\n<p><strong>Comment en est-on arriv\u00e9 l\u00e0 ?<\/strong><\/p>\n<p>Simplement, tr\u00e8s simplement : gr\u00e2ce \u00e0 Mr Moore, ou, pour \u00eatre plus pr\u00e9cis, \u00e0 l<strong>&lsquo;incroyable \u00e9volution de la puissance des machines<\/strong>.<\/p>\n<p><strong>Pourquoi optimiser, si les machines gagnent un facteur 2 tous les 18 mois <\/strong>tant c\u00f4t\u00e9 serveurs que c\u00f4t\u00e9 client<strong> ?<\/strong><\/p>\n<p>La question suivante est naturellement : mais<strong> que va-t-on devenir ?<\/strong><\/p>\n<p>Je veux dire : va-t-on continuer \u00e0 \u00ab\u00a0g\u00e2cher\u00a0\u00bb \u00e0 ce point les ressources IT ou les choses vont elles \u00ab\u00a0naturellement\u00a0\u00bb \u00e9voluer, pour aller vers un peu plus de raison&#8230;<\/p>\n<p>toujours difficile et risqu\u00e9 de r\u00e9pondre&#8230;<\/p>\n<p>Je pense que les choses vont \u00e9voluer, avec des sauts technologiques, pouss\u00e9s par des nouvelles solutions, qui seront accept\u00e9es, parce qu&rsquo;elles trouveront un axe malin pour se propager&#8230;<\/p>\n<p>Google peut naturellement \u00eatre un acteur de ces r\u00e9volutions \u00e0 venir, ils travaillent \u00e0 plusieurs niveaux pour optimiser un peu \u00ab\u00a0tout ce bazar\u00a0\u00bb !<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Quand on regarde se qui se passe, entre l&rsquo;envoie d&rsquo;une requ\u00eate par le navigateur et l&rsquo;affichage du r\u00e9sultat, on est frapp\u00e9 par l&rsquo;incroyable g\u00e2chis, \u00e0 tous les niveaux. Incroyable \u00e0 un niveau difficile \u00e0 imaginer. Intuitivement, je dirais au moins 1000, mais la r\u00e9alit\u00e9 est sans doute bien plus \u00e9lev\u00e9e. 1000 ? 1000 quoi ? [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[2],"tags":[379,84],"class_list":["post-1584","post","type-post","status-publish","format-standard","hentry","category-e-commerce","tag-araok","tag-internet"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Le g\u00e2chis ph\u00e9nom\u00e9nal de puissance des syst\u00e8mes Internet - Ziserman.com<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ziserman.com\/blog\/2009\/07\/27\/le-gachis-phenomenal-de-puissance-des-systemes-interne\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Le g\u00e2chis ph\u00e9nom\u00e9nal de puissance des syst\u00e8mes Internet - Ziserman.com\" \/>\n<meta property=\"og:description\" content=\"Quand on regarde se qui se passe, entre l&rsquo;envoie d&rsquo;une requ\u00eate par le navigateur et l&rsquo;affichage du r\u00e9sultat, on est frapp\u00e9 par l&rsquo;incroyable g\u00e2chis, \u00e0 tous les niveaux. 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