【eclipse】修改eclipse.ini解决eclipse假死问题

起因

win8.1、双核CPU、16G内存，装eclipse以后报错非常诡异，有时候开俩仨eclipse妥妥的没事，有时开一个就卡的不可描述，假死

解决方案

step1、修改eclipse.ini参数，扩大JVM的内存（能解决一部分人的问题，然而对我并没有什么卵用）

<code class="hljs haml has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: "Source Code Pro", monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">-<span class="ruby" style="box-sizing: border-box;"><span class="hljs-constant" style="box-sizing: border-box;">XX</span><span class="hljs-symbol" style="color: rgb(0, 102, 102); box-sizing: border-box;">:MaxPermSize=</span><span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">4096</span>M</span>-<span class="ruby" style="box-sizing: border-box;"><span class="hljs-constant" style="box-sizing: border-box;">Xms256m</span></span>-<span class="ruby" style="box-sizing: border-box;">Xmx4096m</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li></ul>

step2、设置并行GC（最低是双核cpu，好用了一点）

<code class="hljs haml has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: "Source Code Pro", monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">-<span class="ruby" style="box-sizing: border-box;"><span class="hljs-constant" style="box-sizing: border-box;">XX</span><span class="hljs-symbol" style="color: rgb(0, 102, 102); box-sizing: border-box;">:+UseParallelGC</span></span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul>

step3、设置默认虚拟机（重中之重）

<code class="hljs tex has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: "Source Code Pro", monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">-vmD:<span class="hljs-command" style="box-sizing: border-box; color: rgb(0, 0, 136);">\jdk</span>1.8.0_25<span class="hljs-command" style="box-sizing: border-box; color: rgb(0, 0, 136);">\bin</span><span class="hljs-command" style="box-sizing: border-box; color: rgb(0, 0, 136);">\javaw</span>.exe（jre下javaw.exe的绝对地址，依据jdk安装位置变动）</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul>

eclipse.ini环境示例

<code class="hljs haml has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: "Source Code Pro", monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">-<span class="ruby" style="box-sizing: border-box;">startup</span>plugins/org.eclipse.equinox.launcher_1.3.0.v20140415-2008.jar-<span class="ruby" style="box-sizing: border-box;">-launcher.library</span>plugins/org.eclipse.equinox.launcher.win32.win32.x86_64_1.1.200.v20140603-1326-<span class="ruby" style="box-sizing: border-box;">product</span>org.eclipse.epp.package.jee.product-<span class="ruby" style="box-sizing: border-box;">-launcher.defaultAction</span>openFile-<span class="ruby" style="box-sizing: border-box;">showsplash</span>org.eclipse.platform-<span class="ruby" style="box-sizing: border-box;">-launcher.<span class="hljs-constant" style="box-sizing: border-box;">XXMaxPermSize</span></span>768m-<span class="ruby" style="box-sizing: border-box;">-launcher.defaultAction</span>openFile-<span class="ruby" style="box-sizing: border-box;">vm</span>D:\jdk1.8.0_25\bin\javaw.exe-<span class="ruby" style="box-sizing: border-box;">-launcher.appendVmargs</span>-<span class="ruby" style="box-sizing: border-box;">vmargs</span>-<span class="ruby" style="box-sizing: border-box;"><span class="hljs-constant" style="box-sizing: border-box;">Dosgi</span>.requiredJavaVersion=<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1.5</span></span>-<span class="ruby" style="box-sizing: border-box;"><span class="hljs-constant" style="box-sizing: border-box;">XX</span><span class="hljs-symbol" style="color: rgb(0, 102, 102); box-sizing: border-box;">:MaxPermSize=</span><span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">4096</span>M</span>-<span class="ruby" style="box-sizing: border-box;"><span class="hljs-constant" style="box-sizing: border-box;">Xms256m</span></span>-<span class="ruby" style="box-sizing: border-box;"><span class="hljs-constant" style="box-sizing: border-box;">Xmx4096m</span></span>-<span class="ruby" style="box-sizing: border-box;"><span class="hljs-constant" style="box-sizing: border-box;">XX</span><span class="hljs-symbol" style="color: rgb(0, 102, 102); box-sizing: border-box;">:+UseParallelGC</span></span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li></ul>

结果

问题解决、使用流畅、一本满足

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原因分析

从官方文档等是可以找到原因的，eclipse.ini官方说明、eclipse.ini官方参数说明、JVM参数优化。

eclipse.ini放置在eclipse安装文件夹的根目录下，是控制eclipse启动的text文件。在里面默认设置了eclipse的几项启动参数，可直接增删改查文件设置eclipse的启动参数，缺省参数eclipse会设置默认值，如没有设置JVM位置则eclipse会使用系统默认的VM。 
重要参数如下：

参数说明默认值-vmargs没有默认值设置，仅表示后面都是JVM参数，前面的是eclipse参数 -XX:MaxPermSize=128mJVM初始分配的最大非堆内存，这里官方标示不能在所有平台上检测到JVM默认为128M或缺省（缺省值和-server -client选项相关。-server选项下默认MaxPermSize为64m；-client选项下默认MaxPermSize为32m），按需分配。一般设置为最大堆内存的1/4，但是过小会导致内存溢出-Xms40m设置JVM Heap（堆内存）最小值默认为40M，初始分配-Xmx512m设置JVM Heap（堆内存）最大值默认为512M，按需分配，过小会导致内存溢出，JVM报错，无法用try catch捕捉

这里有一句话非常重要，就是并不能在所有平台上都能检测到JVM虚拟机，需要我们告诉eclipse本地虚拟机的位置。

在官方资料上也特别说明了这一点：

<code class="hljs applescript has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: "Source Code Pro", monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">One <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">of</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">the</span> most recommended options <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">to</span> use <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">is</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">to</span> specify a specific JVM <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span> Eclipse <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">to</span> <span class="hljs-command" style="box-sizing: border-box;">run</span> <span class="hljs-function_start" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">on</span>.</span> Doing this ensures <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">that</span> you are absolutely certain which JVM Eclipse will <span class="hljs-command" style="box-sizing: border-box;">run</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">and</span> insulates you <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">from</span> system changes <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">that</span> can alter <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">the</span> <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"default"</span> JVM <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span> your system. Many a user has been tripped up because they thought they knew what JVM would be used <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">by</span> default, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">but</span> they thought wrong. eclipse.ini lets you be CERTAIN.</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul>

翻译：官方推荐在eclipse运行时设置一个特定的JVM，这样可以确保JVM是eclipse的默认虚拟机。很多用户错误的认为JVM是默认虚拟机，然而事实并非如此。用户可通过eclipse.ini来修正虚拟机。

经查证，window下指定JVM需要设置-vm参数，例：

<code class="hljs tex has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: "Source Code Pro", monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">-vmC:<span class="hljs-command" style="box-sizing: border-box; color: rgb(0, 0, 136);">\jdk</span>1.7.0_21<span class="hljs-command" style="box-sizing: border-box; color: rgb(0, 0, 136);">\bin</span><span class="hljs-command" style="box-sizing: border-box; color: rgb(0, 0, 136);">\javaw</span>.exe </code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul>

<code class="hljs tex has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: "Source Code Pro", monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">-vm C:<span class="hljs-command" style="box-sizing: border-box; color: rgb(0, 0, 136);">\jdk</span>1.7.0_21<span class="hljs-command" style="box-sizing: border-box; color: rgb(0, 0, 136);">\jre</span><span class="hljs-command" style="box-sizing: border-box; color: rgb(0, 0, 136);">\bin</span><span class="hljs-command" style="box-sizing: border-box; color: rgb(0, 0, 136);">\java</span>.exe</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul>

<code class="hljs tex has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: "Source Code Pro", monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">-vmC:<span class="hljs-command" style="box-sizing: border-box; color: rgb(0, 0, 136);">\Development</span><span class="hljs-command" style="box-sizing: border-box; color: rgb(0, 0, 136);">\Java</span>\64bit<span class="hljs-command" style="box-sizing: border-box; color: rgb(0, 0, 136);">\jdk</span>1.7.0_09<span class="hljs-command" style="box-sizing: border-box; color: rgb(0, 0, 136);">\jre</span><span class="hljs-command" style="box-sizing: border-box; color: rgb(0, 0, 136);">\bin</span><span class="hljs-command" style="box-sizing: border-box; color: rgb(0, 0, 136);">\server</span><span class="hljs-command" style="box-sizing: border-box; color: rgb(0, 0, 136);">\jvm</span>.dll</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul>

指定的位置应该是本地java运行环境/bin目录/java程序或ava共享库（jvm.dll或libjvm.so）的绝对地址。eclipse和JVM的位数必须相同，即32位eclipse配置32位JVM，64位eclipse配置64位JVM，交叉不能运行。

重要的tips

tips1： 
设置最大最小JVM内存也和系统的位数有关，32位系统下，一般限制在1.5G~2G；64位操作系统对内存无限制。 
tips2： 
初始分配的堆内存由-Xms指定，默认是物理内存的1/64； 
最大分配的堆内存由-Xmx指定，默认是物理内存的1/4； 
最大非堆内存的大小由–XX:MaxPermSize设置，默认是物理内存的1/4