{"id":1191,"date":"2019-12-26T02:30:05","date_gmt":"2019-12-25T18:30:05","guid":{"rendered":"http:\/\/149.129.74.185\/?p=1191"},"modified":"2019-12-26T02:30:05","modified_gmt":"2019-12-25T18:30:05","slug":"%e8%ae%a1%e7%ae%97%e6%9c%ba%e4%bd%93%e7%b3%bb%e7%bb%93%e6%9e%84-week-16-note","status":"publish","type":"post","link":"http:\/\/www.magicmipamipa.com\/?p=1191","title":{"rendered":"[\u8ba1\u7b97\u673a\u4f53\u7cfb\u7ed3\u6784] Week 16 Note"},"content":{"rendered":"<p><span> Virtual Memory \u865a\u62df\u5185\u5b58<\/span><\/p>\n<p>\u4ec0\u4e48\u662f\u865a\u62df\u5185\u5b58\uff1f<\/p>\n<ul>\n<li>\u5141\u8bb8\u6267\u884c\u7a0b\u5e8f\u7684\u6280\u672f\n<ul>\n<li>\u53ef\u4ee5\u9a7b\u7559\u5728\u4e0d\u8fde\u7eed\u7684\u5185\u5b58\u4f4d\u7f6e<\/li>\n<li>\u4e0d\u5fc5\u5b8c\u5168\u9a7b\u7559\u5728\u5185\u5b58\u4e2d<\/li>\n<\/ul>\n<\/li>\n<li>\u5141\u8bb8\u8ba1\u7b97\u673a\u201c\u4f2a\u9020\u201d\u7a0b\u5e8f\uff0c\u4f7f\u5176\u76f8\u4fe1\n<ul>\n<li>\u5185\u5b58\u662f\u8fde\u7eed\u7684<\/li>\n<li>\u5185\u5b58\u7a7a\u95f4\u6bd4\u7269\u7406\u5185\u5b58\u5927\uff0c\u7ed9\u4eba\u4e00\u79cd\u8d85\u5927\u5185\u5b58\u7684\u9519\u89c9<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>\u4e3a\u4ec0\u4e48\u865a\u62df\u5185\u5b58\u5f88\u91cd\u8981\uff1f<\/p>\n<ul>\n<li>\u4fbf\u5b9c-\u4e0d\u518d\u9700\u8981\u4e70\u5f88\u591a\u5185\u5b58<\/li>\n<li>\u51cf\u8f7b\u7a0b\u5e8f\u5458\u7684\u5185\u5b58\u8d44\u6e90\u7ba1\u7406\u8d1f\u62c5<\/li>\n<li>\u652f\u6301\u591a\u9053\u7a0b\u5e8f\u8bbe\u8ba1\u3001\u5206\u65f6\u3001\u4fdd\u62a4<\/li>\n<li>\u8fde\u7eed\u7684\u865a\u62df\u5730\u5740\uff0c\u6620\u5c04\u5230\u5206\u6563\u7684\u7269\u7406\u5730\u5740<\/li>\n<\/ul>\n<hr \/>\n<p style=\"text-align: center;\" id=\"mcetoc_1dstrh3ls0\"><span style=\"font-size: 36px;\">\u591a\u5904\u7406\u5668<\/span><\/p>\n<p>MIMD<\/p>\n<p>\u96c6\u4e2d\u5171\u4eab\u5b58\u50a8\u5668\u7684\u591a\u5904\u7406\u5668\u7cfb\u7edf<\/p>\n<ul class=\"ul1\">\n<li class=\"li1\"><span class=\"s1\"><\/span><span class=\"s2\">With small processor counts<\/span><span class=\"s3\"><\/span><\/li>\n<li class=\"li1\"><span class=\"s2\">With large caches<\/span><\/li>\n<li class=\"li1\"><span class=\"s3\"><\/span><span class=\"s2\">Called symmetric (shared-memory) multiprocessors <span style=\"color: #ff99cc;\"><strong>(SMPs)<\/strong> \u5bf9\u79f0\u591a\u5904\u7406\u7cfb\u7edf<\/span><\/span><\/li>\n<li class=\"li3\"><span class=\"s3\"><\/span><span class=\"s2\"><span class=\"s2\">Called <strong><span style=\"color: #ff99cc;\">UMA<\/span><\/strong> for uniform memory access\u00a0<\/span><\/span><span style=\"color: #ff99cc;\">\u7edf\u4e00\u5185\u5b58\u8bbf\u95ee<\/span><\/li>\n<\/ul>\n<p>\u5206\u5e03\u5f0f\u5b58\u50a8\u5668\u7684\u591a\u5904\u7406\u5668\u7cfb\u7edf\u00a0<span class=\"s1\">Distributed-memory architecture<\/span><\/p>\n<ul class=\"ul1\">\n<li class=\"li1\"><span class=\"s1\"><\/span><span class=\"s2\">With large processor counts<\/span><\/li>\n<li class=\"li1\"><span class=\"s3\"><\/span><span class=\"s2\">the need for a high bandwidth interconnect\u00a0\u5bf9\u9ad8\u5e26\u5bbd\u4e92\u8fde\u7684\u9700\u6c42<\/span><\/li>\n<li class=\"li2\"><span class=\"s3\"><\/span><span class=\"s2\">Advantage:<\/span>\n<ul class=\"ul1\">\n<li class=\"li3\"><span class=\"s4\"><\/span><span class=\"s2\">cost-effective way to scale the memory bandwidth, if most of accesses are to local memory in the node.\u00a0\u5982\u679c\u5927\u591a\u6570\u8bbf\u95ee\u90fd\u662f\u5bf9\u8282\u70b9\u4e2d\u7684\u672c\u5730\u5185\u5b58\u8fdb\u884c\u7684\uff0c\u5219\u91c7\u7528\u7ecf\u6d4e\u9ad8\u6548\u7684\u65b9\u5f0f\u6765\u6269\u5c55\u5185\u5b58\u5e26\u5bbd\u3002<\/span><\/li>\n<li class=\"li4\"><span class=\"s4\"><\/span><span class=\"s2\">It reduces the latency for access to the local memory.<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p>Snooping \u4fa6\u542c<\/p>\n<p>\u6839\u636e\u4e0d\u540c\u7684\u6570\u636e\u6267\u884c\u4e0d\u540c\u7684\u4e8b\u52a1\uff0c\u4e3b\u8981\u9488\u5bf9\u603b\u7ebf\u7ed3\u6784\u3002<\/p>\n<p>Write vaild \u5199\u65e0\u6548\uff1a \u4e00\u4e2a\u4eba\u66f4\u6539 \u5176\u4ed6\u4eba\u4f5c\u5e9f<\/p>\n<p>Write update \u5199\u66f4\u65b0\uff1a \u4e00\u4e2a\u4eba\u66f4\u6539 \u5176\u4ed6\u4eba\u540c\u65f6\u66f4\u65b0<\/p>\n<p>Directory protocol \u76ee\u5f55\u5f0f<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Virtual Memory \u865a\u62df\u5185\u5b58 \u4ec0\u4e48\u662f\u865a\u62df\u5185\u5b58\uff1f \u5141\u8bb8\u6267\u884c\u7a0b\u5e8f\u7684\u6280\u672f \u53ef\u4ee5\u9a7b\u7559\u5728\u4e0d\u8fde\u7eed\u7684\u5185\u5b58 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[21,16],"tags":[],"_links":{"self":[{"href":"http:\/\/www.magicmipamipa.com\/index.php?rest_route=\/wp\/v2\/posts\/1191"}],"collection":[{"href":"http:\/\/www.magicmipamipa.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.magicmipamipa.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.magicmipamipa.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.magicmipamipa.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1191"}],"version-history":[{"count":1,"href":"http:\/\/www.magicmipamipa.com\/index.php?rest_route=\/wp\/v2\/posts\/1191\/revisions"}],"predecessor-version":[{"id":1193,"href":"http:\/\/www.magicmipamipa.com\/index.php?rest_route=\/wp\/v2\/posts\/1191\/revisions\/1193"}],"wp:attachment":[{"href":"http:\/\/www.magicmipamipa.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1191"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.magicmipamipa.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1191"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.magicmipamipa.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1191"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}