On Mac OS X, this can be done by editing MemoryAnalyzer.app/Contents/MacOS/MemoryAnalyzer.ini and increasing the value “-Xmx1024m” until it’s high enough to open the file.

If so, you will need to increase the memory allocated to MAT. When you attempt to open it you may see something like “An internal error occurred during: “Parsing heap dump from ‘/tmp/heapdumps/gf.’”.

usr/java7/bin/jmap -dump:format=b,file=gf. /usr/java7/bin/java gf.core.13849Ī file of this size may not “just work” in MAT. If you have already 1.4.2.12 or better, skip to Installing Eclipse Memory Analyzer. Please note that this operation took almost 90 minutes: Using gf.core.13849 as example of the original 33 GB file, here is how you could convert it into a 26 GB gf. file. If the heap dump provided to you was created with gcore (such as with gcore -o /tmp/gf.core $glassfish_pid) rather than jmap, you will need to convert the file before you can open it in MAT. The Memory Analyzer Tool (MAT) from Eclipse can help you analyze heap dumps, showing you “leak suspects” such as seen at

Download eclipse memory analyzer