{"id":33434,"date":"2019-10-31T21:52:33","date_gmt":"2019-10-31T18:52:33","guid":{"rendered":"https:\/\/prohoster.info\/blog\/kak-rabotaet-szhatie-v-obektno-orientirovannoj-arhitekture-pamyati\/"},"modified":"2019-10-31T21:52:33","modified_gmt":"2019-10-31T18:52:33","slug":"kak-rabotaet-szhatie-v-obektno-orientirovannoj-arhitekture-pamyati","status":"publish","type":"post","link":"https:\/\/prohoster.info\/fr\/blog\/administrirovanie\/kak-rabotaet-szhatie-v-obektno-orientirovannoj-arhitekture-pamyati","title":{"rendered":"Comment fonctionne la compression dans l'architecture de m\u00e9moire orient\u00e9e objet","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Une \u00e9quipe d'ing\u00e9nieurs du MIT a d\u00e9velopp\u00e9 une hi\u00e9rarchie de m\u00e9moire orient\u00e9e objet pour un traitement des donn\u00e9es plus efficace. Cet article examine son fonctionnement.<\/p>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/1cloud\/blog\/451356\/\"><img decoding=\"async\" alt=\"Comment fonctionne la compression dans l&#039;architecture de m\u00e9moire orient\u00e9e objet\" src=\"\/wp-content\/uploads\/2019\/05\/a868d6b2ce7268a09551659ee134b36f.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\n<i>\/ <noindex>PxHere<\/noindex> \/ PD<\/i><\/p>\n<p>Comme on le sait, l'augmentation de la performance des CPU modernes n'est pas accompagn\u00e9e d'une r\u00e9duction correspondante de la latence d'acc\u00e8s \u00e0 la m\u00e9moire. L'\u00e9cart dans les chiffres d'une ann\u00e9e \u00e0 l'autre peut atteindre jusqu'\u00e0 10 fois (<noindex><a rel=\"nofollow\" href=\"http:\/\/aircconline.com\/ijcsit\/V9N2\/9217ijcsit14.pdf\">PDF, p.3<\/a><\/noindex>). En cons\u00e9quence, un goulot d'\u00e9tranglement se forme, ce qui emp\u00eache l'utilisation compl\u00e8te des ressources disponibles et ralentit le traitement des donn\u00e9es.<\/p>\n<p>La performance est affect\u00e9e par ce qu'on appelle la latence de d\u00e9compression. Dans certains cas, jusqu'\u00e0 64 cycles de processeur peuvent \u00eatre n\u00e9cessaires pour la pr\u00e9paration \u00e0 la d\u00e9compression des donn\u00e9es. <\/p>\n<p>Pour comparaison : l'addition et la multiplication de nombres \u00e0 virgule flottante <noindex><a rel=\"nofollow\" href=\"http:\/\/ithare.com\/wp-content\/uploads\/part101_infographics_v08.png\">prennent<\/a><\/noindex> pas plus de dix cycles. Le probl\u00e8me est que la m\u00e9moire op\u00e8re avec des blocs de donn\u00e9es de taille fixe, tandis que les applications manipulent des objets qui peuvent contenir divers types de donn\u00e9es et varier en taille. Pour r\u00e9soudre ce probl\u00e8me, les ing\u00e9nieurs du MIT ont \u00e9labor\u00e9 une hi\u00e9rarchie de m\u00e9moire orient\u00e9e objet qui optimise le traitement des donn\u00e9es.<\/p>\n<h2>Comment fonctionne la technologie<\/h2>\n<p>\nLa solution repose sur trois technologies : Hotpads, Zippads et l'algorithme de compression COCO.<\/p>\n<p>Les Hotpads sont une hi\u00e9rarchie de m\u00e9moire \u00e0 acc\u00e8s rapide g\u00e9r\u00e9e par logiciel (<noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/Scratchpad_memory\">scratchpad<\/a><\/noindex>). Ces registres sont appel\u00e9s pads et il y en a trois : de L1 \u00e0 L3. Ils stockent des objets de tailles vari\u00e9es, des m\u00e9tadonn\u00e9es et des tableaux de pointeurs.<\/p>\n<p>Essentiellement, l'architecture repr\u00e9sente un syst\u00e8me de caches, mais optimis\u00e9 pour le travail avec des objets. Le niveau du pad auquel un objet appartient d\u00e9pend de la fr\u00e9quence de son utilisation. Si l'un des niveaux est \u00ab satur\u00e9 \u00bb, le syst\u00e8me d\u00e9clenche un m\u00e9canisme similaire aux \u00ab ramasse-miettes \u00bb dans les langages Java ou Go. Il analyse quels objets sont moins utilis\u00e9s que les autres et les d\u00e9place automatiquement entre les niveaux.<\/p>\n<blockquote><p>Les Zippads fonctionnent sur la base des Hotpads : ils archiviennent et d\u00e9sarchiviennent les donn\u00e9es qui entrent ou sortent des deux derniers niveaux de la hi\u00e9rarchie \u2014 le pad L3 et la m\u00e9moire principale. Dans le premier et le deuxi\u00e8me pad, les donn\u00e9es sont conserv\u00e9es sous leur forme originale.<\/p><\/blockquote>\n<p>\n <img decoding=\"async\" alt=\"Comment fonctionne la compression dans l&#039;architecture de m\u00e9moire orient\u00e9e objet\" src=\"\/wp-content\/uploads\/2019\/05\/3a4ee154cc1db4c9c5a30c668a6f9eff.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nZippads compresse les objets dont la taille ne d\u00e9passe pas 128 octets. Les objets plus volumineux sont divis\u00e9s en parties, qui sont ensuite plac\u00e9es \u00e0 diff\u00e9rents emplacements en m\u00e9moire. Selon les d\u00e9veloppeurs, cette approche augmente le coefficient d'utilisation efficace de la m\u00e9moire.<\/p>\n<p>Pour compresser les objets, l'algorithme COCO (Cross-Object COmpression) est utilis\u00e9, dont nous parlerons plus loin, bien que le syst\u00e8me soit \u00e9galement capable de travailler avec <noindex><a rel=\"nofollow\" href=\"https:\/\/users.ece.cmu.edu\/~omutlu\/pub\/bdi-compression_pact12.pdf\">Base-Delta-Immediate<\/a><\/noindex> ou <noindex><a rel=\"nofollow\" href=\"https:\/\/ieeexplore.ieee.org\/document\/4589203\">FPC<\/a><\/noindex>. L'algorithme COCO est une variante de la compression diff\u00e9rentielle (<noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/Data_differencing\">differential compression<\/a><\/noindex>). Il compare les objets avec des \u00ab objets de base \u00bb et supprime les bits redondants \u2014 voir le sch\u00e9ma ci-dessous :<\/p>\n<p><img decoding=\"async\" alt=\"Comment fonctionne la compression dans l&#039;architecture de m\u00e9moire orient\u00e9e objet\" src=\"\/wp-content\/uploads\/2019\/05\/46907c8eac74b6af0a1b3985da9a899b.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>Selon les ing\u00e9nieurs du MIT, leur hi\u00e9rarchie de m\u00e9moire orient\u00e9e objet est 17 % plus performante que les approches classiques. Elle est beaucoup plus proche de l'architecture des applications modernes, donc cette nouvelle m\u00e9thode a du potentiel.<\/p>\n<p>Il est pr\u00e9vu que la technologie soit d'abord adopt\u00e9e par les entreprises travaillant avec de grandes donn\u00e9es et des algorithmes d'apprentissage automatique. Un autre domaine potentiel est celui des plateformes cloud. Les fournisseurs IaaS pourront travailler plus efficacement avec la virtualisation, les syst\u00e8mes de stockage de donn\u00e9es et les ressources informatiques.<\/p>\n<blockquote><p><b>Nos ressources et sources suppl\u00e9mentaires :<\/b><\/p>\n<p><img decoding=\"async\" alt=\"Comment fonctionne la compression dans l&#039;architecture de m\u00e9moire orient\u00e9e objet\" src=\"\/wp-content\/uploads\/2019\/05\/faae4338d86f47fd991344b068aa98c5.png\" style=\"display:block;margin: 0 auto;\" \/> <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/1cloud\/blog\/450602\/\">\u00ab Comment nous construisons IaaS \u00bb : documents sur le travail de 1cloud<\/a><\/noindex><\/p>\n<p><img decoding=\"async\" alt=\"Comment fonctionne la compression dans l&#039;architecture de m\u00e9moire orient\u00e9e objet\" src=\"\/wp-content\/uploads\/2019\/05\/fad529f9a72742ad3c7b708c1d5a855f.png\" style=\"display:block;margin: 0 auto;\" \/> <noindex><a rel=\"nofollow\" href=\"https:\/\/1cloud.ru\/blog\/our-system-architecture-evolution?utm_source=habrahabr&amp;utm_medium=cpm&amp;utm_campaign=compress&amp;utm_content=blog\">L'\u00e9volution de l'architecture du cloud 1cloud<\/a><\/noindex><br \/>\n<img decoding=\"async\" alt=\"Comment fonctionne la compression dans l&#039;architecture de m\u00e9moire orient\u00e9e objet\" src=\"\/wp-content\/uploads\/2019\/05\/8bfab7a7977ce3f4f0f3d0703d660148.png\" style=\"display:block;margin: 0 auto;\" \/> <noindex><a rel=\"nofollow\" href=\"https:\/\/1cloud.ru\/services\/storage?utm_source=habrahabr&amp;utm_medium=cpm&amp;utm_campaign=compress&amp;utm_content=site\">Le service de stockage d'objets chez 1cloud<\/a><\/noindex><\/p>\n<p><img decoding=\"async\" alt=\"Comment fonctionne la compression dans l&#039;architecture de m\u00e9moire orient\u00e9e objet\" src=\"\/wp-content\/uploads\/2019\/05\/c175bf85fd93b81c5bb58fa87250d3cf.png\" style=\"display:block;margin: 0 auto;\" \/> <noindex><a rel=\"nofollow\" href=\"https:\/\/www.facebook.com\/1cloudru\/photos\/a.1526614574327724\/2317948435194330\/?type=3&amp;theater\">Attaques potentielles sur HTTPS et moyens de s'en prot\u00e9ger<\/a><\/noindex><br \/>\n<img decoding=\"async\" alt=\"Comment fonctionne la compression dans l&#039;architecture de m\u00e9moire orient\u00e9e objet\" src=\"\/wp-content\/uploads\/2019\/05\/f0dd68a3e2383d73b3769f556e6ca03a.png\" style=\"display:block;margin: 0 auto;\" \/> <noindex><a rel=\"nofollow\" href=\"http:\/\/www.facebook.com\/1cloudru\/posts\/2309275519394955\">En quoi les approches de Continuous Delivery et de Continuous Integration se ressemblent-elles et en quoi diff\u00e8rent-elles ?<\/a><\/noindex><br \/>\n<img decoding=\"async\" alt=\"Comment fonctionne la compression dans l&#039;architecture de m\u00e9moire orient\u00e9e objet\" src=\"\/wp-content\/uploads\/2019\/05\/2124861baee61e029d4bdbaead1d9c5a.png\" style=\"display:block;margin: 0 auto;\" \/> <noindex><a rel=\"nofollow\" href=\"http:\/\/www.facebook.com\/1cloudru\/posts\/2311523002503540\">Comment prot\u00e9ger un serveur sur Internet : l'exp\u00e9rience de 1cloud<\/a><\/noindex><\/p><\/blockquote>\n<p>Source : <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/1cloud\/blog\/451356\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041a\u043e\u043c\u0430\u043d\u0434\u0430 \u0438\u043d\u0436\u0435\u043d\u0435\u0440\u043e\u0432 \u0438\u0437 MIT \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0430\u043b\u0430 \u043e\u0431\u044a\u0435\u043a\u0442\u043d\u043e-\u043e\u0440\u0438\u0435\u043d\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u0443\u044e \u0438\u0435\u0440\u0430\u0440\u0445\u0438\u044e \u043f\u0430\u043c\u044f\u0442\u0438 \u0434\u043b\u044f \u0431\u043e\u043b\u0435\u0435 \u044d\u0444\u0444\u0435\u043a\u0442\u0438\u0432\u043d\u043e\u0439 \u0440\u0430\u0431\u043e\u0442\u044b \u0441 \u0434\u0430\u043d\u043d\u044b\u043c\u0438. \u0412 \u0441\u0442\u0430\u0442\u044c\u0435 \u0440\u0430\u0437\u0431\u0438\u0440\u0430\u0435\u043c\u0441\u044f \u0441 \u0442\u0435\u043c, \u043a\u0430\u043a \u043e\u043d\u0430 \u0443\u0441\u0442\u0440\u043e\u0435\u043d\u0430. \/ PxHere \/ PD \u041a\u0430\u043a \u0438\u0437\u0432\u0435\u0441\u0442\u043d\u043e, \u0440\u043e\u0441\u0442 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438 \u0441\u043e\u0432\u0440\u0435\u043c\u0435\u043d\u043d\u044b\u0445 CPU \u043d\u0435 \u0441\u043e\u043f\u0440\u043e\u0432\u043e\u0436\u0434\u0430\u0435\u0442\u0441\u044f \u0441\u043e\u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u0443\u044e\u0449\u0438\u043c \u0441\u043d\u0438\u0436\u0435\u043d\u0438\u0435\u043c \u0437\u0430\u0434\u0435\u0440\u0436\u043a\u0438 \u043f\u0440\u0438 \u043e\u0431\u0440\u0430\u0449\u0435\u043d\u0438\u0438 \u043a \u043f\u0430\u043c\u044f\u0442\u0438. \u0420\u0430\u0437\u043d\u0438\u0446\u0430 \u0432 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u0438 \u043f\u043e\u043a\u0430\u0437\u0430\u0442\u0435\u043b\u0435\u0439 \u043e\u0442 \u0433\u043e\u0434\u0430 \u043a \u0433\u043e\u0434\u0443 \u043c\u043e\u0436\u0435\u0442 \u0434\u043e\u0445\u043e\u0434\u0438\u0442\u044c \u0434\u043e 10 \u0440\u0430\u0437 (PDF, [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":25147,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-33434","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.2 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041a\u043e\u043c\u0430\u043d\u0434\u0430 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