{"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\/nl\/blog\/administrirovanie\/kak-rabotaet-szhatie-v-obektno-orientirovannoj-arhitekture-pamyati","title":{"rendered":"Hoe compressie werkt in objectgeori\u00ebnteerde geheugarchitectuur","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Een team ingenieurs van MIT heeft een objectgeori\u00ebnteerde geheugenhi\u00ebrarchie ontwikkeld voor een effici\u00ebntere omgang met gegevens. In dit artikel onderzoeken we hoe deze is opgebouwd.<\/p>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/1cloud\/blog\/451356\/\"><img decoding=\"async\" alt=\"Hoe compressie werkt in objectgeori\u00ebnteerde geheugarchitectuur\" 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>Zoals bekend, gaat de prestatiegroei van moderne CPU's niet gepaard met een overeenkomstige vermindering van de latentie bij geheugentoegang. Het verschil in de veranderingen van de prestaties kan van jaar tot jaar oplopen tot 10 keer (<noindex><a rel=\"nofollow\" href=\"http:\/\/aircconline.com\/ijcsit\/V9N2\/9217ijcsit14.pdf\">PDF, blz. 3<\/a><\/noindex>). Het resultaat is een bottleneck die voorkomt dat de aanwezige middelen volledig worden benut en die de gegevensverwerking vertraagt.<\/p>\n<p>De zogenaamde decompressielatentie schaadt de prestaties. In sommige gevallen kan de voorbereidende decompressie van gegevens tot wel 64 processorcycli duren. <\/p>\n<p>Ter vergelijking: het optellen en vermenigvuldigen van drijvende komma-nummers <noindex><a rel=\"nofollow\" href=\"http:\/\/ithare.com\/wp-content\/uploads\/part101_infographics_v08.png\">neemt<\/a><\/noindex> niet meer dan tien cycli in beslag. Het probleem is dat geheugen werkt met blokken van vaste grootte, terwijl applicaties omgaan met objecten die verschillende typen gegevens kunnen bevatten en van elkaar kunnen verschillen in grootte. Om dit probleem op te lossen, hebben ingenieurs van MIT een objectgeori\u00ebnteerde geheugenhi\u00ebrarchie ontwikkeld die de gegevensverwerking optimaliseert.<\/p>\n<h2>Hoe de technologie werkt<\/h2>\n<p>\nDe oplossing is gebaseerd op drie technologie\u00ebn: Hotpads, Zippads en het COCO-compressie-algoritme.<\/p>\n<p>Hotpads is een softwaregestuurde hi\u00ebrarchie van ultra-korte registergeheugen (<noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/Scratchpad_memory\">scratchpad<\/a><\/noindex>). Deze registers worden pads (pads) genoemd en er zijn er drie \u2014 van L1 tot L3. Ze bevatten objecten van verschillende grootte, metadata en arrays van verwijzingen.<\/p>\n<p>In feite is de architectuur een cachesysteem, maar speciaal ontworpen voor objecten. Het niveau van de pad waarop het object zich bevindt, hangt af van hoe vaak het wordt gebruikt. Als een van de niveaus \u2018overloopt\u2019, activeert het systeem een mechanisme dat vergelijkbaar is met \u2018garbage collectors\u2019 in de talen Java of Go. Het analyseert welke objecten minder vaak worden gebruikt dan de andere en verplaatst ze automatisch tussen de niveaus.<\/p>\n<blockquote><p>Zippads werkt op basis van Hotpads \u2014 het archiveert en dearchiveert gegevens die binnenkomen of vertrekken van de laatste twee niveaus in de hi\u00ebrarchie \u2014 pad L3 en het hoofdgeheugen. In de eerste en tweede pad worden de gegevens in onveranderde toestand opgeslagen.<\/p><\/blockquote>\n<p>\n <img decoding=\"async\" alt=\"Hoe compressie werkt in objectgeori\u00ebnteerde geheugarchitectuur\" src=\"\/wp-content\/uploads\/2019\/05\/3a4ee154cc1db4c9c5a30c668a6f9eff.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nZippads comprimeert objecten met een volume van maximaal 128 bytes. Grotere objecten worden verdeeld in delen die vervolgens op verschillende plekken in het geheugen worden geplaatst. Zoals de ontwikkelaars zeggen, verhoogt deze aanpak de effici\u00ebntie van het gebruik van geheugen.<\/p>\n<p>Voor het comprimeren van objecten wordt het COCO-algoritme (Cross-Object COmpression) gebruikt, waarover we later meer zullen vertellen, hoewel het systeem ook kan werken met <noindex><a rel=\"nofollow\" href=\"https:\/\/users.ece.cmu.edu\/~omutlu\/pub\/bdi-compression_pact12.pdf\">Base-Delta-Immediate<\/a><\/noindex> of <noindex><a rel=\"nofollow\" href=\"https:\/\/ieeexplore.ieee.org\/document\/4589203\">FPC<\/a><\/noindex>. Het COCO-algoritme is een vorm van differenti\u00eble compressie (<noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/Data_differencing\">differential compression<\/a><\/noindex>). Het vergelijkt objecten met 'basisobjecten' en verwijdert herhalende bits \u2014 zie schema hieronder:<\/p>\n<p><img decoding=\"async\" alt=\"Hoe compressie werkt in objectgeori\u00ebnteerde geheugarchitectuur\" src=\"\/wp-content\/uploads\/2019\/05\/46907c8eac74b6af0a1b3985da9a899b.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>Volgens ingenieurs van MIT is hun objectgeori\u00ebnteerde geheugenhierarchie 17% effici\u00ebnter dan klassieke benaderingen. Het komt veel dichter in de buurt van de architectuur van moderne applicaties, waardoor de nieuwe methode potentieel heeft.<\/p>\n<p>Het wordt verwacht dat technologie in eerste instantie zal worden gebruikt door bedrijven die werken met big data en machine learning-algoritmen. Een andere potenti\u00eble richting zijn cloudplatforms. IaaS-providers krijgen de mogelijkheid om effici\u00ebnter om te gaan met virtualisatie, opslag- en computermiddelen.<\/p>\n<blockquote><p><b>Onze aanvullende bronnen en referenties:<\/b><\/p>\n<p><img decoding=\"async\" alt=\"Hoe compressie werkt in objectgeori\u00ebnteerde geheugarchitectuur\" 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\/\">Hoe we IaaS bouwen: materialen over het werk van 1cloud<\/a><\/noindex><\/p>\n<p><img decoding=\"async\" alt=\"Hoe compressie werkt in objectgeori\u00ebnteerde geheugarchitectuur\" 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\">De evolutie van cloudarchitectuur 1cloud<\/a><\/noindex><br \/>\n<img decoding=\"async\" alt=\"Hoe compressie werkt in objectgeori\u00ebnteerde geheugarchitectuur\" 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\">Object opslagdienst in 1cloud<\/a><\/noindex><\/p>\n<p><img decoding=\"async\" alt=\"Hoe compressie werkt in objectgeori\u00ebnteerde geheugarchitectuur\" 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\">Potenti\u00eble aanvallen op HTTPS en manieren om je ertegen te beschermen<\/a><\/noindex><br \/>\n<img decoding=\"async\" alt=\"Hoe compressie werkt in objectgeori\u00ebnteerde geheugarchitectuur\" 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\">What Are the Similarities and Differences Between Continuous Delivery and Continuous Integration Approaches<\/a><\/noindex><br \/>\n<img decoding=\"async\" alt=\"Hoe compressie werkt in objectgeori\u00ebnteerde geheugarchitectuur\" 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\">How to Protect Your Server on the Internet: 1cloud's Experience<\/a><\/noindex><\/p><\/blockquote>\n<p>Bron: <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 5.0.3 - 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 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0430\u043b\u0430 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