{"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\/pl\/blog\/administrirovanie\/kak-rabotaet-szhatie-v-obektno-orientirovannoj-arhitekture-pamyati","title":{"rendered":"Jak dzia\u0142a kompresja w obiektowej architekturze pami\u0119ci","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Zesp\u00f3\u0142 in\u017cynier\u00f3w z MIT opracowa\u0142 obiektow\u0105 hierarchi\u0119 pami\u0119ci, aby efektywniej zarz\u0105dza\u0107 danymi. W artykule analizujemy, jak zosta\u0142a skonstruowana.<\/p>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/1cloud\/blog\/451356\/\"><img decoding=\"async\" alt=\"Jak dzia\u0142a kompresja w obiektowej architekturze pami\u0119ci\" 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>Jak wiadomo, wzrost wydajno\u015bci nowoczesnych procesor\u00f3w CPU nie wi\u0105\u017ce si\u0119 z odpowiednim spadkiem op\u00f3\u017anienia podczas dost\u0119pu do pami\u0119ci. R\u00f3\u017cnice w zmianach wska\u017anik\u00f3w z roku na rok mog\u0105 si\u0119ga\u0107 nawet 10 razy (<noindex><a rel=\"nofollow\" href=\"http:\/\/aircconline.com\/ijcsit\/V9N2\/9217ijcsit14.pdf\">PDF, str.3<\/a><\/noindex>). W efekcie powstaje w\u0105skie gard\u0142o, kt\u00f3re uniemo\u017cliwia pe\u0142ne wykorzystanie dost\u0119pnych zasob\u00f3w i spowalnia przetwarzanie danych.<\/p>\n<p>Szkody w wydajno\u015bci powoduje tzw. op\u00f3\u017anienie dekompresji. W niekt\u00f3rych przypadkach na wst\u0119pn\u0105 dekompresj\u0119 danych mo\u017ce by\u0107 potrzebnych do 64 cykli procesora. <\/p>\n<p>Dla por\u00f3wnania: dodawanie i mno\u017cenie liczb zmiennoprzecinkowych <noindex><a rel=\"nofollow\" href=\"http:\/\/ithare.com\/wp-content\/uploads\/part101_infographics_v08.png\">zajmuje<\/a><\/noindex> nie wi\u0119cej ni\u017c dziesi\u0119\u0107 cykli. Problem polega na tym, \u017ce pami\u0119\u0107 dzia\u0142a z blokami danych o sta\u0142ej wielko\u015bci, a aplikacje operuj\u0105 obiektami, kt\u00f3re mog\u0105 zawiera\u0107 r\u00f3\u017cne typy danych i r\u00f3\u017cni\u0107 si\u0119 od siebie rozmiarem. Aby rozwi\u0105za\u0107 problem, in\u017cynierowie z MIT opracowali obiektow\u0105 hierarchi\u0119 pami\u0119ci, kt\u00f3ra optymalizuje przetwarzanie danych.<\/p>\n<h2>Jak dzia\u0142a technologia<\/h2>\n<p>\nPodstaw\u0105 rozwi\u0105zania s\u0105 trzy technologie: Hotpads, Zippads i algorytm kompresji COCO.<\/p>\n<p>Hotpads to zarz\u0105dzana programowo hierarchia ultraszybkiej pami\u0119ci rejestrowej (<noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/Scratchpad_memory\">scratchpad<\/a><\/noindex>). Te rejestry nazywane s\u0105 pads i jest ich trzy \u2014 od L1 do L3. Przechowuj\u0105 obiekty r\u00f3\u017cnych rozmiar\u00f3w, metadane i tablice wska\u017anik\u00f3w.<\/p>\n<p>W zasadzie architektura stanowi system cache'\u00f3w, ale dostosowany do pracy z obiektami. Poziom pada, na kt\u00f3rym znajduje si\u0119 obiekt, zale\u017cy od cz\u0119stotliwo\u015bci jego u\u017cywania. Je\u015bli jeden z poziom\u00f3w jest \"przepe\u0142niony\", system uruchamia mechanizm podobny do \"\u015bmieciarzy\" w j\u0119zykach Java lub Go. Analizuje, jakie obiekty s\u0105 u\u017cywane rzadziej od innych i automatycznie przenosi je mi\u0119dzy poziomami.<\/p>\n<blockquote><p>Zippads dzia\u0142a na podstawie Hotpads \u2014 archiwizuje i dekompresuje dane, kt\u00f3re wchodz\u0105 lub wychodz\u0105 z dw\u00f3ch ostatnich poziom\u00f3w hierarchii \u2014 pada L3 i pami\u0119ci g\u0142\u00f3wnej. W pierwszym i drugim padzie dane s\u0105 przechowywane w niezmienionej formie.<\/p><\/blockquote>\n<p>\n <img decoding=\"async\" alt=\"Jak dzia\u0142a kompresja w obiektowej architekturze pami\u0119ci\" src=\"\/wp-content\/uploads\/2019\/05\/3a4ee154cc1db4c9c5a30c668a6f9eff.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nZippads kompresuje obiekty, kt\u00f3rych rozmiar nie przekracza 128 bajt\u00f3w. Wi\u0119ksze obiekty dziel\u0105 si\u0119 na fragmenty, kt\u00f3re nast\u0119pnie s\u0105 umieszczane w r\u00f3\u017cnych lokalizacjach pami\u0119ci. Jak pisz\u0105 deweloperzy, takie podej\u015bcie zwi\u0119ksza wsp\u00f3\u0142czynnik efektywnie wykorzystywanej pami\u0119ci.<\/p>\n<p>Do kompresji obiekt\u00f3w zastosowany jest algorytm COCO (Cross-Object COmpression), o kt\u00f3rym opowiemy dalej, chocia\u017c system mo\u017ce tak\u017ce pracowa\u0107 z <noindex><a rel=\"nofollow\" href=\"https:\/\/users.ece.cmu.edu\/~omutlu\/pub\/bdi-compression_pact12.pdf\">Base-Delta-Immediate<\/a><\/noindex> lub <noindex><a rel=\"nofollow\" href=\"https:\/\/ieeexplore.ieee.org\/document\/4589203\">FPC<\/a><\/noindex>. Algorytm COCO jest rodzajem kompresji r\u00f3\u017cnicowej (<noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/Data_differencing\">differential compression<\/a><\/noindex>). Por\u00f3wnuje on obiekty z \"bazowymi\" i usuwa powtarzaj\u0105ce si\u0119 bity \u2013 zobacz schemat poni\u017cej:<\/p>\n<p><img decoding=\"async\" alt=\"Jak dzia\u0142a kompresja w obiektowej architekturze pami\u0119ci\" src=\"\/wp-content\/uploads\/2019\/05\/46907c8eac74b6af0a1b3985da9a899b.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>Wed\u0142ug in\u017cynier\u00f3w z MIT, ich obiektowo zorientowana hierarchia pami\u0119ci jest o 17% bardziej wydajna ni\u017c klasyczne metody. Jest znacznie bli\u017csza strukturze nowoczesnych aplikacji, dlatego nowa metoda ma potencja\u0142.<\/p>\n<p>Spodziewane jest, \u017ce technologi\u0119 mog\u0105 najpierw zacz\u0105\u0107 stosowa\u0107 firmy zajmuj\u0105ce si\u0119 danymi du\u017cymi i algorytmami uczenia maszynowego. Kolejnym potencjalnym kierunkiem s\u0105 platformy chmurowe. Dostawcy IaaS b\u0119d\u0105 mogli skuteczniej zarz\u0105dza\u0107 wirtualizacj\u0105, systemami przechowywania danych i zasobami obliczeniowymi.<\/p>\n<blockquote><p><b>Nasze dodatkowe zasoby i \u017ar\u00f3d\u0142a:<\/b><\/p>\n<p><img decoding=\"async\" alt=\"Jak dzia\u0142a kompresja w obiektowej architekturze pami\u0119ci\" 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\/\">\u201eJak budujemy IaaS\u201d: materia\u0142y o pracy 1cloud<\/a><\/noindex><\/p>\n<p><img decoding=\"async\" alt=\"Jak dzia\u0142a kompresja w obiektowej architekturze pami\u0119ci\" 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\">Ewolucja architektury chmury 1cloud<\/a><\/noindex><br \/>\n<img decoding=\"async\" alt=\"Jak dzia\u0142a kompresja w obiektowej architekturze pami\u0119ci\" 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\">Us\u0142uga pami\u0119ci obiektowej w 1cloud<\/a><\/noindex><\/p>\n<p><img decoding=\"async\" alt=\"Jak dzia\u0142a kompresja w obiektowej architekturze pami\u0119ci\" 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\">Potencjalne ataki na HTTPS i sposoby ochrony przed nimi<\/a><\/noindex><br \/>\n<img decoding=\"async\" alt=\"Jak dzia\u0142a kompresja w obiektowej architekturze pami\u0119ci\" 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\">Jakie s\u0105 podobie\u0144stwa i r\u00f3\u017cnice mi\u0119dzy podej\u015bciami Continuous Delivery i Continuous Integration<\/a><\/noindex><br \/>\n<img decoding=\"async\" alt=\"Jak dzia\u0142a kompresja w obiektowej architekturze pami\u0119ci\" 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\">Jak zabezpieczy\u0107 serwer w internecie: do\u015bwiadczenie 1cloud<\/a><\/noindex><\/p><\/blockquote>\n<p>\u0179r\u00f3d\u0142o: <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 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041a\u043e\u043c\u0430\u043d\u0434\u0430 \u0438\u043d\u0436\u0435\u043d\u0435\u0440\u043e\u0432 \u0438\u0437 MIT 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