I am trying to take heap dump using below 2 commands jcmd $pid GC.heap_dump /tmp/filename.dump jmap -dump:format=b,file=/tmp/filename.dump $pid jcmd produces file size of ~300M and jmap produces file size of ~1.4G. why these are different sizes, do we have any additional information in jmap ? am I missing som…
Tag: jmap
jhat throwing unrecognized magic number
I am trying to analyse a heap dump taken from a java process that ran into memory issues. The dump was taken using jmap. I am using jhat on the dump file – I am getting java.io.IOException: Unrecognized magic number: 169897589 at com.sun.tools.hat.internal.parser.Reader.readFile(Reader.java:94) at com.s…