cat Test.java
public class Test {
public static void main(String[] args) {
for (;;) {
}
}
}
javac Test.java
java -XX:+PrintCommandLineFlags Test
you should get something like this:
-XX:InitialHeapSize=67108864 -XX:MaxHeapSize=1073741824 -XX:+PrintCommandLineFlags -XX:+UseParallelGC
1 comment:
No need for Test class to exist, one can use -version switch or supply whatever (non-existing) class name to java, e.g.:
$ java -XX:+PrintCommandLineFlags -version
-XX:InitialHeapSize=194891840 -XX:MaxHeapSize=3118269440 -XX:+PrintCommandLineFlags -XX:+UseCompressedClassPointers -XX:+UseCompressedOops -XX:+UseParallelGC
java version "1.8.0_101"
Java(TM) SE Runtime Environment (build 1.8.0_101-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.101-b13, mixed mode)
For extra details, the -XX:+PrintFlagsFinal is also interesting flag :)
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