一行命令获取当前JVM所有可设置的参数以及当前默认值

一行命令获取当前JVM所有可设置的参数以及当前默认值

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