Top "Jvm-hotspot" questions

-XX:MaxPermSize with or without -XX:PermSize

We've run into a Java.lang.OutOfMemoryError: PermGen space error and looking at the tomcat JVM params, other than the …

java jvm jvm-hotspot permgen

Real differences between "java -server" and "java -client"?

Is there any real practical difference between "java -server" and "java -client"? All I can find on Sun's site is …

java jvm jvm-hotspot

Class JavaLaunchHelper is implemented in both ... libinstrument.dylib. One of the two will be used. Which one is undefined

I upgraded to the latest Java 7u40 on MacOS X and started getting the following message on the console when …

java eclipse macos jvm jvm-hotspot

How do I write a correct micro-benchmark in Java?

How do you write (and run) a correct micro-benchmark in Java? I'm looking for some code samples and comments illustrating …

java jvm benchmarking jvm-hotspot microbenchmark

What are ReservedCodeCacheSize and InitialCodeCacheSize?

Can someone please explain what the JVM option ReservedCodeCacheSize and InitialCodeCacheSize are? Specifically when/why would I want to change …

java jvm jvm-hotspot

Difference between JVM and HotSpot?

What exactly is HotSpot and how does it relate to JVM and OpenJDK? Is it a library? What exactly does …

java jvm-hotspot

Running jmap getting Unable to open socket file

I had to run jmap in order to take heap dump of my process. but jvm returned: Unable to open …

java linux jvm jvm-hotspot

Default for XX:MaxDirectMemorySize

What is the default value for XX:MaxDirectMemorySize?

java memory-management jvm jvm-arguments jvm-hotspot

What do -XX:-PrintGC and XX:-PrintGCDetails flags do?

I found the JVM flags here. Is there a more detailed explaination of what exactly they do?

java garbage-collection jvm jvm-hotspot

What does the UseCompressedOops JVM flag do and when should I use it?

What does the HotSpot JVM flag -XX:+UseCompressedOops do and when should I use it? What sort of performance and …

java memory jvm jvm-hotspot