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