{"id":4525,"date":"2018-04-04T18:33:30","date_gmt":"2018-04-04T09:33:30","guid":{"rendered":"https:\/\/blog.bitmeister.jp\/?p=4525"},"modified":"2018-04-11T10:37:51","modified_gmt":"2018-04-11T01:37:51","slug":"%e8%aa%a4%e3%81%a3%e3%81%9f%e4%b8%a6%e5%88%97%e5%8c%96%e3%81%ab%e3%82%88%e3%82%8b%e6%80%a7%e8%83%bd%e5%8a%a3%e5%8c%96","status":"publish","type":"post","link":"https:\/\/blog.bitmeister.jp\/?p=4525","title":{"rendered":"\u8aa4\u3063\u305f\u4e26\u5217\u5316\u306b\u3088\u308b\u6027\u80fd\u52a3\u5316\uff08\u305d\u306e\uff11\uff09"},"content":{"rendered":"<p><a href=\"https:\/\/blog.bitmeister.jp\/?p=4496\">\u524d\u56de\u306e\u8a18\u4e8b<\/a>\u3067\u300c\u8907\u6570\u306e\u30b9\u30ec\u30c3\u30c9\u304c\u5171\u6709\u3059\u308b\u5909\u6570\u3092\u30a4\u30f3\u30af\u30ea\u30e1\u30f3\u30c8\u3059\u308b\u3068\u304d\u306b\u306f\u6392\u4ed6\u5236\u5fa1\u304c\u5fc5\u8981\u300d\u3068\u3044\u3046\u8a71\u3092\u3057\u307e\u3057\u305f\u3002\u305d\u306e\u7d50\u679c\u3001\u6b63\u3057\u3044\u5024\u3092\u5f97\u308b\u3053\u3068\u306b\u306f\u6210\u529f\u3057\u305f\u3082\u306e\u306e\u3001\u6027\u80fd\u304c\u8457\u3057\u304f\u843d\u3061\u308b\u3068\u3044\u3046\u77e5\u898b\u3092\u5f97\u307e\u3057\u305f\u3002\u4eca\u56de\u306f\u6027\u80fd\u304c\u51fa\u306a\u3044\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u30d7\u30ed\u30b0\u30e9\u30e0\u306b\u5bfe\u3057\u3066\u5272\u308a\u5f53\u3066\u308bCPU\u6570\u3092\u3042\u3048\u3066\u5236\u9650\u3057\u3066\u307f\u307e\u3059\u3002<\/p>\n<p><!--more--><\/p>\n<p>\u4f7f\u3046\u30d7\u30ed\u30b0\u30e9\u30e0&#8221;mutex_test.c&#8221;\u306fC\u8a00\u8a9e\u3067\u66f8\u304b\u308c\u305f\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u3001\u8d77\u52d5\u3059\u308b\u306810\u500b\u306e\u30b9\u30ec\u30c3\u30c9\u3092\u8d77\u3053\u3057\u3001\u305d\u308c\u305e\u308c\u306e\u30b9\u30ec\u30c3\u30c9\u304c\u5171\u6709\u5909\u6570\u3092100\u4e07\u56de\u30ab\u30a6\u30f3\u30c8\u30a2\u30c3\u30d7\u3057\u307e\u3059\u3002\u30ab\u30a6\u30f3\u30c8\u30a2\u30c3\u30d7\u3059\u308b\u30af\u30ea\u30c6\u30a3\u30ab\u30eb\u30bb\u30af\u30b7\u30e7\u30f3\u306b\u306f\u8907\u6570\u306e\u30b9\u30ec\u30c3\u30c9\u304c\u540c\u6642\u306b\u4fb5\u5165\u3059\u308b\u3053\u3068\u304c\u306a\u3044\u3088\u3046mutex\u3067\u4fdd\u8b77\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"brush: cpp; gutter: false; title: ; notranslate\" title=\"\">\r\n#include &lt;stdio.h&gt;\r\n#include &lt;pthread.h&gt;\r\n\r\n\r\nstruct params {\r\n    int *i; \r\n    pthread_mutex_t *mut;\r\n};\r\n\r\nvoid *func(void *arg) {\r\n    int j;\r\n    struct params *prm = (struct params *) arg;\r\n\r\n    for (j = 0; j &lt; 1000000; j++) {\r\n        pthread_mutex_lock(prm-&gt;mut);\r\n        (*(int *)prm-&gt;i)++; \/\/ counts up\r\n        pthread_mutex_unlock(prm-&gt;mut);\r\n    }   \r\n\r\n    return NULL;\r\n}\r\n\r\nint main() {\r\n    int n = 0, x = 0;\r\n    pthread_t th&#x5B;10];\r\n    pthread_mutex_t mut = PTHREAD_MUTEX_INITIALIZER;\r\n    struct params prm = {&amp;x, &amp;mut};\r\n\r\n    for (n = 0; n &lt; 10; n++)\r\n        pthread_create(&amp;th&#x5B;n], NULL, func, &amp;prm);\r\n\r\n    for (n = 0; n &lt; 10; n++)\r\n        pthread_join(th&#x5B;n], NULL);\r\n\r\n    printf(&quot;%d\\n&quot;, x); \r\n\r\n    return 0;\r\n}\r\n<\/pre>\n<p>\u3053\u306e\u30bd\u30fc\u30b9\u3092\u30b3\u30f3\u30d1\u30a4\u30eb\u3057\u3066\u304b\u3089\u3001time\u30b3\u30de\u30f3\u30c9\u3092\u565b\u307e\u305b\u3066\u5b9f\u884c\u3059\u308b\u3068\u3001<\/p>\n<pre class=\"brush: bash; gutter: false; title: ; notranslate\" title=\"\">\r\n$ gcc mutex_test.c -lpthread -Wall\r\n$ time .\/a.out \r\n10000000\r\n\r\nreal\t0m2.117s\r\nuser\t0m1.272s\r\nsys\t0m14.747s\r\n<\/pre>\n<p>\u3053\u3093\u306a\u7d50\u679c\u304c\u8fd4\u308a\u307e\u3059\u30021000\u4e07\u56de\u306e\u30ab\u30a6\u30f3\u30c8\u30a2\u30c3\u30d7\u306b\u30e6\u30fc\u30b6CPU\u6642\u95931.3\u79d2\u3068\u30b7\u30b9\u30c6\u30e0CPU\u6642\u959314.7\u79d2\u306e\u5408\u8a08\u3067\u300116\u79d2\u3082\u306eCPU\u6642\u9593\u3092\u6d88\u8cbb\u3057\u3066\u3044\u307e\u3059\u3002\u4f7f\u3063\u3066\u3044\u308b\u30de\u30b7\u30f3\u306eCPU\u306f Intel Xeon E31230 \u3067\u52d5\u4f5c\u5468\u6ce2\u65703.20GHz\u30014\u30b3\u30a28\u30b9\u30ec\u30c3\u30c9\u306a\u306e\u3067\u3001\u5358\u7d14\u8a08\u7b97\u3059\u308b\u3068\u7d042000\u5104\u30af\u30ed\u30c3\u30af\u30b5\u30a4\u30af\u30eb(16\u79d2*3.20GHz*4\u30b3\u30a2)\u3092\u6d88\u8cbb\u3057\u3066\u3044\u307e\u3059\u3002\u3064\u307e\u308a\u6574\u6570\u578b\u306e\u5024\u30921\u56de\u30a4\u30f3\u30af\u30ea\u30e1\u30f3\u30c8\u3059\u308b\u306b\u3042\u305f\u3063\u30662\u4e07\u30af\u30ed\u30c3\u30af\u30b5\u30a4\u30af\u30eb\u3068\u3044\u3046\u6975\u3081\u3066\u30cf\u30a4\u30b3\u30b9\u30c8\u306a\u51e6\u7406\u304c\u767a\u751f\u3057\u3066\u3044\u308b\u308f\u3051\u3067\u3059\u3002\u6bce\u56de\u5747\u4e00\u306b2\u4e07\u30af\u30ed\u30c3\u30af\u30b5\u30a4\u30af\u30eb\u3092\u6d88\u8cbb\u3059\u308b\u308f\u3051\u3067\u306f\u306a\u3044\u306e\u3067\u5e73\u5747\u306b\u3042\u307e\u308a\u610f\u5473\u306f\u3042\u308a\u307e\u305b\u3093\u304c\u3001\u611f\u899a\u7684\u306b\u30a8\u30af\u30b9\u30da\u30f3\u30b7\u30d6\u3067\u3059\u3002<\/p>\n<p>\u898b\u65b9\u3092\u5909\u3048\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u30a4\u30f3\u30af\u30ea\u30e1\u30f3\u30c8\u81ea\u4f53\u306b\u305d\u3093\u306a\u30b3\u30b9\u30c8\u304c\u304b\u304b\u308b\u308f\u3051\u304c\u3042\u308a\u307e\u305b\u3093\u3002\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u30b9\u30a4\u30c3\u30c1\u30f3\u30b0\u3084\u30b9\u30ec\u30c3\u30c9\u5b89\u5168\u78ba\u4fdd\u306e\u305f\u3081\u306e\u6392\u4ed6\u5236\u5fa1\u306e\u30aa\u30fc\u30d0\u30d8\u30c3\u30c9\u304c\u3044\u304b\u306b\u5927\u304d\u3044\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002\u3053\u306e\u30aa\u30fc\u30d0\u30d8\u30c3\u30c9\u306b\u898b\u5408\u3046\u3060\u3051\u306e\u51e6\u7406\u3092\u3057\u306a\u3051\u308c\u3070\u3001\u4e26\u5217\u5316\u306b\u3088\u3063\u3066\u6027\u80fd\u304c\u843d\u3061\u307e\u3059\u3002<\/p>\n<p>\u3067\u306f\u8a66\u3057\u306b\u3001taskset\u30b3\u30de\u30f3\u30c9\u3092\u4f7f\u3063\u3066\u3053\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u4f7f\u7528\u3067\u304d\u308bCPU\u6570\u3092\u5909\u3048\u3066\u50be\u5411\u3092\u898b\u3066\u307f\u307e\u3059\u3002\u307e\u305a\u5168\u3066\u306eCPU\u3092\u4f7f\u3063\u305f\u5834\u5408\u3001<\/p>\n<pre class=\"brush: bash; gutter: false; title: ; notranslate\" title=\"\">\r\n$ time taskset -c 0,1,2,3,4,5,6,7 .\/a.out \r\n10000000\r\n\r\nreal\t0m2.143s\r\nuser\t0m1.340s\r\nsys\t0m14.888s\r\n<\/pre>\n<p>16\u79d2\u3002\u3053\u308c\u306f\u306a\u306b\u3082\u5236\u9650\u3057\u3066\u3044\u306a\u3044\u3053\u3068\u3068\u5909\u308f\u3089\u306a\u3044\u306e\u3067\u3001\u7d50\u679c\u3082\u540c\u7a0b\u5ea6\u3067\u3059\u3002\u6b21\u306b\u3001CPU\u6570\u30924\u3064\u306b\u5236\u9650\u3057\u305f\u5834\u5408\u3001<\/p>\n<pre class=\"brush: bash; gutter: false; title: ; notranslate\" title=\"\">\r\n$ time taskset -c 0,1,2,3 .\/a.out \r\n10000000\r\n\r\nreal\t0m0.978s\r\nuser\t0m0.912s\r\nsys\t0m2.778s\r\n<\/pre>\n<p>4\u79d2\u3002CPU\u6642\u9593\u306e\u6d88\u8cbb\u304c\u5927\u5e45\u306b\u6e1b\u308a\u307e\u3057\u305f\u3002\u3067\u306f\u6b21\u306b\u3001CPU\u6570\u30921\u3064\u306b\u5236\u9650\u3057\u305f\u5834\u5408\u3001<\/p>\n<pre class=\"brush: bash; gutter: false; title: ; notranslate\" title=\"\">\r\n$ time taskset -c 0 .\/a.out \r\n10000000\r\n\r\nreal\t0m0.213s\r\nuser\t0m0.209s\r\nsys\t0m0.004s\r\n<\/pre>\n<p>0.213\u79d2\u3002\u304a\u308f\u304b\u308a\u3044\u305f\u3060\u3051\u305f\u3067\u3057\u3087\u3046\u304b\u300275\u500d\u9ad8\u901f\u306b\u306a\u308a\u307e\u3057\u305f\u3002\u540c\u3058\u30d7\u30ed\u30b0\u30e9\u30e0\u306a\u306e\u3067\u7121\u99c4\u306b10\u30b9\u30ec\u30c3\u30c9\u304c\u8d77\u52d5\u3057\u3066\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u30b9\u30a4\u30c3\u30c1\u30f3\u30b0\u304c\u767a\u751f\u3057\u307e\u3059\u3057\u3001\u5404\u30b9\u30ec\u30c3\u30c9\u304c\u30ed\u30c3\u30af\u7372\u5f97\u306e\u305f\u3081\u306e\u5f85\u3061\u884c\u5217\u306b\u4e26\u3076\u53ef\u80fd\u6027\u3082\u3042\u308a\u307e\u3059\u304c\u3001CPU\u9593\u3067\u306e\u51e6\u7406\u79fb\u8b72\u306e\u53ef\u80fd\u6027\u3092\u6392\u9664\u3057\u305f\u3060\u3051\u3067\u3053\u308c\u3060\u3051\u51e6\u7406\u304c\u52b9\u7387\u5316\u3057\u307e\u3059\u3002<\/p>\n<p>\u9811\u5f35\u3063\u3066\u4e26\u5217\u5316\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3057\u3066\u307f\u305f\u3082\u306e\u306e\u3001\u5b9f\u306f1\u3064\u306eCPU\u3092\u5272\u308a\u5f53\u3066\u305f\u307b\u3046\u304c\u901f\u3044\u306a\u3093\u3066\u3044\u3046\u8a2d\u8a08\u3067\u306f\u76ee\u3082\u5f53\u3066\u3089\u308c\u307e\u305b\u3093\u3002\u30dc\u30c8\u30eb\u30cd\u30c3\u30af\u3092\u898b\u6975\u3081\u307e\u3057\u3087\u3046\u3002\u3042\u308b\u3044\u306f\u3082\u3057\u8ab0\u304b\u304c\u4f5c\u3063\u305f\u91cd\u305f\u3044\u30d7\u30ed\u30bb\u30b9\u306b\u30011\u3064\u306eCPU\u306e\u307f\u3092\u5272\u308a\u5f53\u3066\u3066\u307f\u308b\u3068\u3001\u3059\u3066\u304d\u306a\u7d50\u679c\u3092\u5f97\u3089\u308c\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/p>\n<p><a href=\"https:\/\/blog.bitmeister.jp\/?p=4548\">\u6b21\u56de<\/a>\u306f\u3001\u4eca\u56de\u306fmutex\u306e\u30ed\u30c3\u30af\u7372\u5f97\u3068\u958b\u653e\u306b\u3064\u3044\u3066\u7c21\u5358\u306a\u5b9f\u9a13\u3057\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u524d\u56de\u306e\u8a18\u4e8b\u3067\u300c\u8907\u6570\u306e\u30b9\u30ec\u30c3\u30c9\u304c\u5171\u6709\u3059\u308b\u5909\u6570\u3092\u30a4\u30f3\u30af\u30ea\u30e1\u30f3\u30c8\u3059\u308b\u3068\u304d\u306b\u306f\u6392\u4ed6\u5236\u5fa1\u304c\u5fc5\u8981\u300d\u3068\u3044\u3046\u8a71\u3092\u3057\u307e\u3057\u305f\u3002\u305d\u306e\u7d50\u679c\u3001\u6b63\u3057\u3044\u5024\u3092\u5f97\u308b\u3053\u3068\u306b\u306f\u6210\u529f\u3057\u305f\u3082\u306e\u306e\u3001\u6027\u80fd\u304c\u8457\u3057\u304f\u843d\u3061\u308b\u3068\u3044\u3046\u77e5\u898b\u3092\u5f97\u307e\u3057\u305f\u3002\u4eca\u56de\u306f\u6027\u80fd\u304c\u51fa\u306a\u3044\u30de\u30eb\u30c1\u30b9 [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17,1],"tags":[],"class_list":["post-4525","post","type-post","status-publish","format-standard","hentry","category-tech","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/blog.bitmeister.jp\/index.php?rest_route=\/wp\/v2\/posts\/4525","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.bitmeister.jp\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.bitmeister.jp\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.bitmeister.jp\/index.php?rest_route=\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.bitmeister.jp\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4525"}],"version-history":[{"count":28,"href":"https:\/\/blog.bitmeister.jp\/index.php?rest_route=\/wp\/v2\/posts\/4525\/revisions"}],"predecessor-version":[{"id":4586,"href":"https:\/\/blog.bitmeister.jp\/index.php?rest_route=\/wp\/v2\/posts\/4525\/revisions\/4586"}],"wp:attachment":[{"href":"https:\/\/blog.bitmeister.jp\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4525"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.bitmeister.jp\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4525"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.bitmeister.jp\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4525"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}