Java的性能调校
by tonny.xu on Aug.09, 2007, under Blog System
以前做Java的项目，基本上不会遇到对性能进行调校的事情，但是最近遇到了一个比较严重的问题。具体情况不便详细说，但是大致情况如下：
- Server： Intel Xeon Duo 2 *2
- Memory: 4G
- Disk: 3500G
- JDK: 1.5.0_02
- Web Server: Tomcat 5.5.19
- Application: Some kind of OpenSource Project A which contains about 27M’s package.
在Tomcat中配置了虚拟主机，运行了4份A的独立版本。运行起来以后，内存占用3G左右，在安装第5份的时候出现OutOfMemory的异常，由此引发了JVM性能调校的课题。
首先找到了一片比较浅显的文档：
- Java Tuning White Paper, Sun Microsystems, [live].
其中提到了性能调校的几个要点：
- 在所有对JVM的调校进行之前，先做以下的检查：
- 是否使用了最新的Java Release？
- Java是否更新到了最新的update？
- OS的补丁是否已经更新到最新？
- OS中是否还跑着其他许多不需要的应用程序？
- 其次对JVM进行以下的调校：
- 是否使用了Server HotSpot？
- 有没有使用并行GC？(ParallelGC)
- 初始化堆内存(heap size)大小是多少？推荐使用物理内存的1/64
- 最大堆内存(heap size)是多少？推荐使用物理内存的1/4
- 调校之前一定要准确的收集系统的运行情况数据并进行分析
- 可以参考使用JVM的管理与监视相关文档
在这样的指导下。我准备对我的系统做以下的操作步骤：
在Java tuning white paper中直接提到了一些GC调整的方式，在使用了ParallelGC以后，系统的运行确实能提高不少，但是具体的仍然有问题，等我的Monitoring和Profiling结束以后再报告。
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