一行命令获取当前JVM所有可设置的参数以及当前默认值

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java -XX:+PrintFlagsInitial >>1.txt

然后查看这个1.txt即可

    uintx AdaptivePermSizeWeight                    = 20              {product}               uintx AdaptiveSizeDecrementScaleFactor          = 4               {product}               uintx AdaptiveSizeMajorGCDecayTimeScale         = 10              {product}               uintx AdaptiveSizePausePolicy                   = 0               {product}               uintx AdaptiveSizePolicyCollectionCostMargin    = 50              {product}      ........    ........

具体的参数含义可以百度,当然也可以去查找open JDK的源码查看

另外给一个目前我个人觉得不错的eclipse JVM参数

JDK 6 下:

-vmargs-Xverify:none-client-XX:-UseSplitVerifier-Dosgi.requiredJavaVersion=1.6-Xms256m-Xmx256m-XX:MaxPermSize=200m-XX:PermSize=200m-XX:+ExplicitGCInvokesConcurrentAndUnloadsClasses-XX:+CMSPermGenSweepingEnabled-XX:+CMSClassUnloadingEnabled-XX:+UseConcMarkSweepGC -XX:+UseParNewGC-XX:CompileThreshold=1000-XX:+UseStringCache-XX:+UseFastAccessorMethods-XX:+UseBiasedLocking-XX:CMSFullGCsBeforeCompaction=5-XX:+UseCMSCompactAtFullCollection-XX:+UseThreadPriorities-XX:+MaxFDLimit-XX:-DontCompileHugeMethods-XX:InitialCodeCacheSize=128m-XX:ReservedCodeCacheSize=128m