{"id":979,"date":"2014-08-11T21:18:49","date_gmt":"2014-08-11T13:18:49","guid":{"rendered":"http:\/\/coderbee.net\/?p=979"},"modified":"2014-08-13T23:10:51","modified_gmt":"2014-08-13T15:10:51","slug":"java-%e5%af%b9%e8%b1%a1%e5%86%85%e5%ad%98%e5%b8%83%e5%b1%80","status":"publish","type":"post","link":"https:\/\/coderbee.net\/index.php\/java\/20140811\/979","title":{"rendered":"Java \u5bf9\u8c61\u5185\u5b58\u5e03\u5c40"},"content":{"rendered":"<p>\u672c\u6587\u6765\u81ea\uff1a<a href=\"http:\/\/www.ibm.com\/developerworks\/cn\/java\/j-codetoheap\/\">http:\/\/www.ibm.com\/developerworks\/cn\/java\/j-codetoheap\/<\/a><\/p>\n<h2>\u5bfb\u5740\u80fd\u529b\u4e0e\u7528\u6237\u7a7a\u95f4<\/h2>\n<p>\u8fdb\u7a0b\u80fd\u591f\u5904\u7406\u7684\u4f4d\u6570\u53d6\u51b3\u4e8e\u5904\u7406\u5668\u80fd\u5bfb\u5740\u7684\u5185\u5b58\u8303\u56f4\uff0c\u5904\u7406\u5668\u7684\u5bfb\u5740\u80fd\u529b\u53d6\u51b3\u4e8e\u5904\u7406\u5668\u7684\u4f4d\u6570\uff0c\u6bd4\u5982 32 \u4f4d\u80fd\u5bfb\u5740 2^32\uff0c\u4e5f\u5c31\u662f 4G\u3002<\/p>\n<p>\u5904\u7406\u5668\u63d0\u4f9b\u7684\u90e8\u5206\u53ef\u5bfb\u5740\u8303\u56f4\u7531 OS \u672c\u8eab\u7528\uff0c\u4f9b\u64cd\u4f5c\u7cfb\u7edf\u5185\u6838\u4ee5\u53ca C \u8fd0\u884c\u65f6\u3002OS \u548c C \u8fd0\u884c\u65f6\u5360\u7528\u7684\u5185\u5b58\u6570\u91cf\u53d6\u51b3\u4e8e\u6240\u7528\u7684 OS\uff0c\u6bd4\u5982 Windows \u9ed8\u8ba4\u5360\u7528 2GB\u3002\u5269\u4f59\u7684\u53ef\u5bfb\u5740\u7a7a\u95f4\u662f\u4f9b\u8fd0\u884c\u7684\u5b9e\u9645\u8fdb\u7a0b\u4f7f\u7528\u7684\u5185\u5b58\uff08\u7528\u6237\u7a7a\u95f4\uff09\u3002<\/p>\n<p>\u5bf9\u4e8e Java \u5e94\u7528\u7a0b\u5e8f\uff0c\u7528\u6237\u7a7a\u95f4\u662f Java \u8fdb\u7a0b\u5360\u7528\u7684\u5185\u5b58\uff0c\u5b9e\u9645\u4e0a\u5305\u542b\u4e24\u4e2a\u6c60\uff1aJava \u5806\u548c\u672c\u673a\uff08\u975e Java\uff09\u5806\u3002Java \u5806\u7684\u5927\u5c0f\u7531 JVM \u7684 Java \u5806\u8bbe\u7f6e\u63a7\u5236\uff1a-Xms \u548c -Xmx \u5206\u522b\u8bbe\u7f6e\u6700\u5c0f\u548c\u6700\u5927 Java \u5806\u3002\u5728\u6309\u7167\u6700\u5927\u7684\u5927\u5c0f\u8bbe\u7f6e\u5206\u914d\u4e86 Java \u5806\u4e4b\u540e\uff0c\u5269\u4e0b\u7684\u7528\u6237\u7a7a\u95f4\u5c31\u662f\u672c\u673a\u5806\u3002<br \/>\n<img decoding=\"async\" src=\"\/\/coderbee.net\/wp-content\/uploads\/2014\/08\/32bit-JVM.gif\" alt=\"32bit JVM\" \/><\/p>\n<p>\u53ef\u5bfb\u5740\u8303\u56f4\u603b\u5171\u6709 4GB\uff0cOS \u548c C \u8fd0\u884c\u65f6\u5927\u7ea6\u5360\u7528\u4e86\u5176\u4e2d\u7684 1GB\uff0cJava \u5806\u5360\u7528\u4e86\u5c06\u8fd1 2GB\uff0c\u672c\u673a\u5806\u5360\u7528\u4e86\u5176\u4ed6\u90e8\u5206\u3002\u8bf7\u6ce8\u610f\uff0cJVM \u672c\u8eab\u4e5f\u8981\u5360\u7528\u5185\u5b58\uff0c\u5c31\u50cf OS \u5185\u6838\u548c C \u8fd0\u884c\u65f6\u4e00\u6837\uff0c\u800c JVM \u5360\u7528\u7684\u5185\u5b58\u662f\u672c\u673a\u5806\u7684\u5b50\u96c6\u3002<\/p>\n<p><!--more--><\/p>\n<h2>Java \u5bf9\u8c61\u5185\u5b58\u5e03\u5c40<\/h2>\n<p>JVM \u9700\u8981\u989d\u5916\u7684\u5f00\u9500\u6765\u63cf\u8ff0 Java \u5bf9\u8c61\u7684\u5143\u6570\u636e\u3002<\/p>\n<p>\u5bf9\u8c61\u5143\u6570\u636e\u4e00\u822c\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>\u7c7b\u578b\u6307\u9488\uff1a\u5360\u7528\u4e00\u4e2aCPU\u5b57\u3002\u4e00\u4e2a\u6307\u5411\u7c7b\u4fe1\u606f\u7684\u6307\u9488\uff0c\u63cf\u8ff0\u4e86\u5bf9\u8c61\u7684\u7c7b\u578b\u3002<\/li>\n<li>\u6807\u8bb0\uff1a\u5360\u7528\u4e00\u4e2aCPU\u5b57\u3002\u4e00\u7ec4\u6807\u8bb0\uff0c\u63cf\u8ff0\u4e86\u5bf9\u8c61\u7684\u72b6\u6001\uff0c\u5305\u62ec\u5bf9\u8c61\u6563\u5217\u7801\uff08\u5982\u679c\u6709\uff09\u4ee5\u53ca\u5bf9\u8c61\u7684\u5f62\u72b6\uff08\u662f\u5426\u662f\u6570\u7ec4\uff09\u3002<\/li>\n<li>\u9501\uff1a\u5360\u7528\u4e00\u4e2aCPU\u5b57\u3002\u5bf9\u8c61\u7684\u540c\u6b65\u4fe1\u606f\uff0c\u5bf9\u8c61\u76ee\u524d\u662f\u5426\u6b63\u5728\u540c\u6b65\u3002\uff08\u6bcf\u4e2a\u5bf9\u8c61\u90fd\u6709\u4e00\u4e2a\u5185\u7f6e\u9501\uff09<\/li>\n<li>Size\u6570\u7ec4\u957f\u5ea6\uff1a\u5982\u679c\u6807\u8bb0\u663e\u793a\u8fd9\u4e2a\u5bf9\u8c61\u662f\u6570\u7ec4\uff0c\u63cf\u8ff0\u4e86\u6570\u7ec4\u7684\u957f\u5ea6\u3002\uff08\u867d\u7136 Java \u8bed\u8a00\u91cc\u6570\u7ec4\u7684\u957f\u5ea6\u662f 32\u4f4d\u7684\uff0c\u4f46\u5728 64 \u4f4d\u7684 JVM \u91cc\uff0c\u8fd9\u4e2a\u5b57\u6bb5\u8fd8\u662f\u5360\u752864\u4f4d\uff0c\u9664\u975e\u5f00\u542f\u6307\u9488\u538b\u7f29\u3002\uff09<\/li>\n<\/ul>\n<p>\u4e0a\u8ff0\u5143\u6570\u636e\u4e2d\uff0c\u7c7b\u578b\u6307\u9488\u3001\u6807\u8bb0\u3001\u9501 \u5360\u7528\u7684\u5927\u5c0f\u53d6\u51b3\u4e8e CPU \u4f4d\u5bbd\uff1a32\/64 \u4f4d\u3002<\/p>\n<p>\u4e00\u4e2a 32 \u4f4d Java \u8fdb\u7a0b\u7684 int \u6570\u7ec4\u5bf9\u8c61\u7684\u5e03\u5c40\u793a\u4f8b\uff1a<br \/>\n<img decoding=\"async\" src=\"\/\/coderbee.net\/wp-content\/uploads\/2014\/08\/32bit-JVM-int-array-layout.gif\" alt=\"32bit-JVM-int-array-layout\" \/><\/p>\n<p>\u4e00\u4e2a 32 \u4f4d Java \u8fdb\u7a0b\u7684 java.lang.String \u5bf9\u8c61\u7684\u5e03\u5c40\u793a\u4f8b\uff1a<br \/>\n<img decoding=\"async\" src=\"\/\/coderbee.net\/wp-content\/uploads\/2014\/08\/32bit-JVM-String-layout.gif\" alt=\"32bit-JVM-String-layout\" \/><\/p>\n<p>\u5bf9\u4e8e\u4e00\u4e2a 8 \u4e2a\u5b57\u7b26\u7684\u5b57\u7b26\u4e32\uff08128 \u4f4d\u7684 char \u6570\u636e\uff09\uff0c\u9700\u8981\u6709 256 \u4f4d\u7684\u6570\u636e\u7528\u4e8e\u5b57\u7b26\u6570\u7ec4\uff0c224 \u4f4d\u7684\u6570\u636e\u7528\u4e8e\u7ba1\u7406\u8be5\u6570\u7ec4\u7684 java.lang.String \u5bf9\u8c61\uff0c\u56e0\u6b64\u4e3a\u4e86\u8868\u793a 128 \u4f4d\uff0816 \u4e2a\u5b57\u8282\uff09\u7684\u6570\u636e\uff0c\u603b\u5171\u9700\u8981\u5360\u7528 480 \u4f4d\uff0860 \u5b57\u8282\uff09\u3002\u5f00\u9500<\/p>\n<hr\/>\n<p>\u6b22\u8fce\u5173\u6ce8\u6211\u7684\u5fae\u4fe1\u516c\u4f17\u53f7: <strong>coderbee\u7b14\u8bb0<\/strong>\uff0c\u53ef\u4ee5\u66f4\u53ca\u65f6\u56de\u590d\u4f60\u7684\u8ba8\u8bba\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"258\" height=\"258\" src=\"https:\/\/coderbee.net\/wp-content\/uploads\/2019\/01\/coderbee-note.jpg\" class=\"alignnone size-full wp-image-1707\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u672c\u6587\u6765\u81ea\uff1ahttp:\/\/www.ibm.com\/developerworks\/c &hellip; <a href=\"https:\/\/coderbee.net\/index.php\/java\/20140811\/979\">\u7ee7\u7eed\u9605\u8bfb <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18],"tags":[231,233,179],"_links":{"self":[{"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/posts\/979"}],"collection":[{"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/comments?post=979"}],"version-history":[{"count":6,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/posts\/979\/revisions"}],"predecessor-version":[{"id":994,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/posts\/979\/revisions\/994"}],"wp:attachment":[{"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/media?parent=979"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/categories?post=979"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/tags?post=979"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}