1. 手动dump
/root/jdk1.6.0_23/bin/jmap -dump:file=/root/dump/dump3.hprof <进程ID>
2. JVM OME时自动dump
-XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/root/dump
jps -lv |grep /apache-tomcat-6.0.37
-XX:+HeapDumpOnOutOfMemoryError
-XX:+HeapDumpOnCtrlBreak [Ctrl] + [Break]
jmap -dump:format=b,file=/home/testuser/xxx.bin 3433