{"id":31148,"date":"2019-10-31T21:39:44","date_gmt":"2019-10-31T18:39:44","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novyj-balansirovshhik-nagruzki-na-cpu-ot-mit\/"},"modified":"2019-10-31T21:39:44","modified_gmt":"2019-10-31T18:39:44","slug":"novyj-balansirovshhik-nagruzki-na-cpu-ot-mit","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/administrirovanie\/novyj-balansirovshhik-nagruzki-na-cpu-ot-mit","title":{"rendered":"Novo balanceador de carga de CPU do MIT","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<h5>O sistema Shenango est\u00e1 sendo planejado para ser utilizado em data centers.<\/h5>\n<p>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/it-grad\/blog\/447058\/\"><img decoding=\"async\" alt=\"Novo balanceador de carga de CPU do MIT\" src=\"\/wp-content\/uploads\/2019\/04\/9149d445f65d677b43fb02242ae5cc76.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><br \/>\n<i>\/ \u0444\u043e\u0442\u043e <noindex><a rel=\"nofollow\" href=\"https:\/\/www.flickr.com\/photos\/30478819@N08\/45481817492\/\">Marco Verch<\/a><\/noindex> <noindex><a rel=\"nofollow\" href=\"https:\/\/creativecommons.org\/licenses\/by\/2.0\/\">CC BY<\/a><\/noindex><\/i><\/p>\n<p>De acordo com um dos provedores, os data centers <noindex><a rel=\"nofollow\" href=\"https:\/\/arxiv.org\/pdf\/1808.02919.pdf\">utilizam<\/a><\/noindex> utilizam apenas 20-40% dos recursos computacionais dispon\u00edveis. Em altas cargas, esse n\u00famero <noindex><a rel=\"nofollow\" href=\"https:\/\/vita.mcafee.cc\/PDF\/EconPublicCloud.pdf\">pode alcan\u00e7ar 60%<\/a><\/noindex>. Essa distribui\u00e7\u00e3o de recursos leva \u00e0 presen\u00e7a de chamados \"servidores zumbis\". S\u00e3o m\u00e1quinas que ficam inativas a maior parte do tempo, consumindo eletricidade desnecessariamente. Atualmente, 30% dos servidores no mundo <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/it-grad\/blog\/310630\/\">est\u00e3o ociosos<\/a><\/noindex>, consumindo eletricidade no valor de 30 bilh\u00f5es de d\u00f3lares por ano.<\/p>\n<p>A luta contra o consumo ineficiente de recursos computacionais foi iniciada no MIT.<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<p>Uma equipe de engenheiros <noindex><a rel=\"nofollow\" href=\"http:\/\/news.mit.edu\/2019\/shenango-data-center-efficiency-0221\">desenvolveu<\/a><\/noindex> um sistema de balanceamento de carga para processadores chamado Shenango. Seu objetivo \u00e9 monitorar o estado dos buffers de tarefas e redistribuir os processos \"presa\" (aqueles que n\u00e3o conseguem obter tempo de CPU) para m\u00e1quinas livres.<\/p>\n<h2>Como funciona o Shenango<\/h2>\n<p>\nShenango \u00e9 uma biblioteca Linux escrita em C com bindings para Rust e C++. O c\u00f3digo do projeto e os aplicativos de teste est\u00e3o publicados no <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/shenango\/shenango\">reposit\u00f3rio<\/a><\/noindex> no GitHub.<\/p>\n<p>A base da solu\u00e7\u00e3o \u00e9 um algoritmo IOKernel, que \u00e9 executado em um n\u00facleo dedicado de um sistema multiprocessador. Ele gerencia as demandas de CPU usando o framework <noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/Data_Plane_Development_Kit\">DPDK<\/a><\/noindex>, que permite que aplicativos interajam diretamente com dispositivos de rede.<\/p>\n<p>O IOKernel decide a quais n\u00facleos atribuir uma tarefa espec\u00edfica. O algoritmo tamb\u00e9m determina quantos n\u00facleos ser\u00e3o necess\u00e1rios. Para cada processo, s\u00e3o definidos n\u00facleos principais (garantidos) e adicionais (expans\u00edveis) \u2014 os \u00faltimos s\u00e3o acionados em caso de um aumento repentino no n\u00famero de solicita\u00e7\u00f5es de CPU.<\/p>\n<p>A fila de solicita\u00e7\u00f5es do IOKernel \u00e9 organizada na forma de <noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/Circular_buffer\">um buffer circular<\/a><\/noindex>. A cada cinco microsegundos, o algoritmo verifica se todas as tarefas atribu\u00eddas ao n\u00facleo foram conclu\u00eddas. Para isso, ele compara a posi\u00e7\u00e3o atual da \"cabe\u00e7a\" do buffer com a posi\u00e7\u00e3o anterior de seu \"rabo\". Se for constatado que o rabo j\u00e1 estava na fila na verifica\u00e7\u00e3o anterior, o sistema sinaliza uma sobrecarga do buffer e atribui um n\u00facleo adicional ao processo.<\/p>\n<p>Na distribui\u00e7\u00e3o de carga, a prioridade \u00e9 dada aos n\u00facleos onde esse mesmo processo j\u00e1 foi executado antes e parcialmente ficou em cache, ou a quaisquer n\u00facleos ociosos.<\/p>\n<p><img decoding=\"async\" alt=\"Novo balanceador de carga de CPU do MIT\" src=\"\/wp-content\/uploads\/2019\/04\/899d9585c8361f34cb5602c9a09ffece.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nO Shenango tamb\u00e9m utiliza a abordagem <noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/Work_stealing\">work stealing<\/a><\/noindex>Os n\u00facleos dedicados a um \u00fanico aplicativo monitoram a carga de trabalho entre si. Se um n\u00facleo termina sua lista de tarefas antes dos outros, ele \"descarrega\" parte do trabalho dos vizinhos.<\/p>\n<h2>Vantagens e desvantagens<\/h2>\n<p>\nDe acordo com <noindex><a rel=\"nofollow\" href=\"https:\/\/techxplore.com\/news\/2019-02-allocates-time-sensitive-cores-quick-user-response.html\">palavras<\/a><\/noindex> engenheiros do MIT, o Shenango pode processar cinco milh\u00f5es de requisi\u00e7\u00f5es por segundo e manter um tempo de resposta m\u00e9dio de 37 microssegundos. Especialistas afirmam que, em alguns casos, a tecnologia pode aumentar a taxa de utiliza\u00e7\u00e3o dos processadores em data centers para 100%. Como resultado, os operadores de DC poder\u00e3o economizar na compra e manuten\u00e7\u00e3o de servidores.<\/p>\n<p>Potencial da solu\u00e7\u00e3o <noindex><a rel=\"nofollow\" href=\"http:\/\/news.mit.edu\/2019\/shenango-data-center-efficiency-0221\">observam<\/a><\/noindex> e especialistas de outras universidades. Segundo um professor de um instituto coreano, o sistema do MIT ajudar\u00e1 a reduzir a lat\u00eancia em servi\u00e7os web. Por exemplo, ser\u00e1 \u00fatil para lojas online. Em dias de promo\u00e7\u00e3o, at\u00e9 mesmo um segundo de atraso na carga da p\u00e1gina <noindex><a rel=\"nofollow\" href=\"https:\/\/www.shopify.com\/enterprise\/black-friday-ecommerce\">resulta<\/a><\/noindex> em uma redu\u00e7\u00e3o de 11% no n\u00famero de visualiza\u00e7\u00f5es do site. A distribui\u00e7\u00e3o eficiente da carga ajudar\u00e1 a atender mais clientes.<\/p>\n<p>A tecnologia ainda apresenta desvantagens - n\u00e3o suporta sistemas <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/Non-Uniform_Memory_Access\">NUMA<\/a><\/noindex>- onde os chips est\u00e3o conectados a diferentes m\u00f3dulos de mem\u00f3ria e n\u00e3o se \"comunicam\" entre si. Nesse caso, o IOKernel pode regular o funcionamento de um grupo espec\u00edfico de processadores, mas n\u00e3o de todos os chips do servidor.<\/p>\n<p><img decoding=\"async\" alt=\"Novo balanceador de carga de CPU do MIT\" src=\"\/wp-content\/uploads\/2019\/04\/c58be6f2603c7ba8fba2f6030bf4c716.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>\/ \u0444\u043e\u0442\u043e <noindex><a rel=\"nofollow\" href=\"https:\/\/www.flickr.com\/photos\/foto_db\/33508397006\/\">Tim Reckmann<\/a><\/noindex> <noindex><a rel=\"nofollow\" href=\"https:\/\/creativecommons.org\/licenses\/by\/2.0\/\">CC BY<\/a><\/noindex><\/i><\/p>\n<h2>Tecnologias an\u00e1logas<\/h2>\n<p>\nEntre outros sistemas de balanceamento de carga para processadores, destacamos o Arachne. Ele calcula quantos n\u00facleos ser\u00e3o necess\u00e1rios para o aplicativo no momento de seu lan\u00e7amento e distribui os processos de acordo com esse par\u00e2metro. Segundo os autores, a lat\u00eancia m\u00e1xima do aplicativo no Arachne \u00e9 de cerca de 10 mil microssegundos.<\/p>\n<p>A tecnologia \u00e9 implementada como uma biblioteca C++ para Linux, e seu c\u00f3digo-fonte est\u00e1 dispon\u00edvel em <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/PlatformLab\/Arachne\">GitHub<\/a><\/noindex>.<\/p>\n<p>Outro balanceador de carga \u00e9 o ZygOS. Assim como o Shenango, a tecnologia utiliza o m\u00e9todo de roubo de trabalho para redistribuir os processos. De acordo com os autores do ZygOS, a lat\u00eancia m\u00e9dia no funcionamento de aplicativos ao usar a ferramenta \u00e9 de cerca de 150 microssegundos, e a m\u00e1xima \u00e9 de cerca de 450 microssegundos. O c\u00f3digo do projeto tamb\u00e9m <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/ix-project\/zygos\">est\u00e1 dispon\u00edvel publicamente<\/a><\/noindex>.<\/p>\n<h2>Como resultado, obtemos um servi\u00e7o de \"monitoramento como servi\u00e7o\", automatizado na linha de produ\u00e7\u00e3o de integra\u00e7\u00e3o cont\u00ednua. O desenvolvedor ou testador precisa apenas definir a lista de m\u00e9tricas em um arquivo JSON, e tudo o mais acontece automaticamente. Obtemos um controle de qualidade transparente dos lan\u00e7amentos: todas as notifica\u00e7\u00f5es sobre desempenho, consumo de recursos ou regress\u00f5es arquitet\u00f4nicas.<\/h2>\n<p>\nData centers modernos continuam a se expandir. Especialmente vis\u00edvel \u00e9 a tend\u00eancia de crescimento no mercado de data centers hyperscale: atualmente, existem no mundo <noindex>existem<\/noindex> 430 data centers hipermassivos, mas j\u00e1 nos pr\u00f3ximos anos esse n\u00famero pode aumentar em 30%. Por esse motivo, as tecnologias de balanceamento de carga nos processadores ser\u00e3o muito demandadas. Sistemas como o Shenango j\u00e1 est\u00e3o sendo <noindex><a rel=\"nofollow\" href=\"https:\/\/medium.com\/coinmonks\/maximizing-cpu-resource-utilization-on-servers-fcbbb7908e1c\">implementados<\/a><\/noindex> por grandes corpora\u00e7\u00f5es, e no futuro, a quantidade dessas ferramentas s\u00f3 ir\u00e1 aumentar.<\/p>\n<p>\nPostagens do Primeiro blog sobre IaaS corporativo:<\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/iaas-blog.it-grad.ru\/proizvoditelnost\/kak-povysit-energoeffektivnost-data-centra\/\">Como aumentar a efici\u00eancia energ\u00e9tica do data center<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/iaas-blog.it-grad.ru\/novosti\/chto-nuzhno-znat-o-pci-dss-obzor-standarta\/\">O que voc\u00ea precisa saber sobre PCI DSS: vis\u00e3o geral do padr\u00e3o<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/iaas-blog.it-grad.ru\/tendencii\/mir-do-i-posle-kak-izmenilas-zhizn-s-nastupleniem-dns-flag-day\/\">O mundo antes e depois: como a vida mudou com a chegada do DNS Flag Day<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/iaas-blog.it-grad.ru\/tendencii\/kak-iaas-pomogaet-razvivat-biznes-tri-zadachi-kotorye-reshit-oblako\/\">Como o IaaS ajuda a desenvolver neg\u00f3cios: tr\u00eas desafios que a nuvem resolve<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/iaas-blog.it-grad.ru\/proizvoditelnost\/testirovanie-diskovoj-sistemy-v-oblake\/\">Testando sistemas de disco na nuvem: fundamentos e dicas<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/iaas-blog.it-grad.ru\/tendencii\/9-poleznyx-sovetov-dlya-plavnogo-perexoda-v-oblako\/\">9 dicas \u00fateis para uma transi\u00e7\u00e3o suave para a nuvem<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/iaas-blog.it-grad.ru\/funkcionalnost\/iaas-pervye-shagi-posle-arendy-oblachnoj-infrastruktury\/\">IaaS: Primeiros passos ap\u00f3s alugar uma infraestrutura de nuvem<\/a><\/noindex><\/li>\n<\/ul>\n<p>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/it-grad\/blog\/447058\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0421\u0438\u0441\u0442\u0435\u043c\u0443 Shenango \u043f\u043b\u0430\u043d\u0438\u0440\u0443\u044e\u0442 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0432 \u0434\u0430\u0442\u0430-\u0446\u0435\u043d\u0442\u0440\u0430\u0445. \/ \u0444\u043e\u0442\u043e Marco Verch CC BY \u041f\u043e \u0434\u0430\u043d\u043d\u044b\u043c \u043e\u0434\u043d\u043e\u0433\u043e \u0438\u0437 \u043f\u0440\u043e\u0432\u0430\u0439\u0434\u0435\u0440\u043e\u0432, \u0434\u0430\u0442\u0430-\u0446\u0435\u043d\u0442\u0440\u044b \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0442 \u0432\u0441\u0435\u0433\u043e 20\u201340% \u0434\u043e\u0441\u0442\u0443\u043f\u043d\u044b\u0445 \u0432\u044b\u0447\u0438\u0441\u043b\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0445 \u043c\u043e\u0449\u043d\u043e\u0441\u0442\u0435\u0439. \u041f\u0440\u0438 \u0432\u044b\u0441\u043e\u043a\u0438\u0445 \u043d\u0430\u0433\u0440\u0443\u0437\u043a\u0430\u0445 \u044d\u0442\u043e\u0442 \u043f\u043e\u043a\u0430\u0437\u0430\u0442\u0435\u043b\u044c \u043c\u043e\u0436\u0435\u0442 \u0434\u043e\u0441\u0442\u0438\u0433\u0430\u0442\u044c 60%. \u041f\u043e\u0434\u043e\u0431\u043d\u043e\u0435 \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u0435 \u0440\u0435\u0441\u0443\u0440\u0441\u043e\u0432 \u0432\u0435\u0434\u0435\u0442 \u043a \u043f\u043e\u044f\u0432\u043b\u0435\u043d\u0438\u044e \u0442\u0430\u043a \u043d\u0430\u0437\u044b\u0432\u0430\u0435\u043c\u044b\u0445 \u00ab\u0437\u043e\u043c\u0431\u0438-\u0441\u0435\u0440\u0432\u0435\u0440\u043e\u0432\u00bb. \u042d\u0442\u043e \u043c\u0430\u0448\u0438\u043d\u044b, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0431\u043e\u043b\u044c\u0448\u0443\u044e \u0447\u0430\u0441\u0442\u044c \u0432\u0440\u0435\u043c\u0435\u043d\u0438 \u043f\u0440\u043e\u0441\u0442\u0430\u0438\u0432\u0430\u044e\u0442, \u0432\u043f\u0443\u0441\u0442\u0443\u044e \u0440\u0430\u0441\u0445\u043e\u0434\u0443\u044f \u044d\u043b\u0435\u043a\u0442\u0440\u043e\u044d\u043d\u0435\u0440\u0433\u0438\u044e. \u0421\u0435\u0433\u043e\u0434\u043d\u044f 30% \u0441\u0435\u0440\u0432\u0435\u0440\u043e\u0432 \u0432 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":23116,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-31148","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\" 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