JAVA

Quick Tips

Stream (Java 8)

Check JVM default Heap size, Xmx and Xms

java -XX:+PrintFlagsFinal -version | egrep '(InitialHeapSize|MaxHeapSize)'

jstat

jstat -gcutil $PID 250 7

jstat utility attaches to PID, takes 7 samples at 250-millisecond intervals

jstat (Java8)

cd /usr/lib/jvm/java-1.8.0-openjdk.x86_64/bin
./jstat -gc $PID 1000
./jstat -gccapacity $PID 1000

Reference

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