1、jmap

jmap -heap pid

jmap -dump:format=b,file=temp_heapdump.hprof pid

2、jcmd

jcmd 51 VM.command_line >> boot.dump

jcmd 51 VM.system_properties >>sys.prop.dump

jcmd 51 GC.class_histogram >> clz.dump

jcmd 51 GC.heap_dump filename=Myheapdump