Large HPROF file

Question

I have a very large Heap Dump (.hprof) file (16GB). When I try to open it in Visual Vm,the VM just hangs. I tried to open it in JProfiler. Jprofiler gave me a Out Of Memory error. Below is how my jprofiler.vmoptions looks like. What should be the ideal configuration, I should be using in order to open the HPROF without issues? I am running on a 8GB Linux box.

-Xmx1536m -XX:MaxPermSize=128m -Xss2m

The answer might be just get a machine with RAM more then 16GB? — TheMonkWhoSoldHisCode, Jul 10 '14 at 08:17
You are running out of memory. Your arguments indicate you use a 32-bit JVM. Use a 64-bit JVM instead which can utilize more than 4 GB RAM. See http://stackoverflow.com/a/1434901/53897 — Thorbjørn Ravn Andersen, Jul 10 '14 at 09:24
And to answer your question. The JVM delegates paging to the operating system. If an individual application needs more than that, it must implement it itself. — Thorbjørn Ravn Andersen, Jul 10 '14 at 09:52
@ThorbjørnRavnAndersen Spot on. I was indeed using 32bit JVM. I will try with a 64 bit JVM. — TheMonkWhoSoldHisCode, Jul 10 '14 at 11:58
Possible duplicate of [Tool for analyzing large Java heap dumps](https://stackoverflow.com/questions/7254017/tool-for-analyzing-large-java-heap-dumps) — rogerdpack, Feb 05 '18 at 17:04

score 3 · Accepted Answer · answered Jul 10 '14 at 08:36

3

JProfiler 8.1 will be able to open much larger HPROF files without tuning the -Xmx VM parameter. To get a pre-release, please contact support@ej-technologies.

answered Jul 10 '14 at 08:36

Ingo Kegel

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Thnx Ingo for the answer. but is it possible to open larger files on smaller machines. so fundamentally, can I open a 16GB HPROF on a 8 G machine? My assumption is since it is a heap dump, so i would require a 16GB machine to open it up? – TheMonkWhoSoldHisCode Jul 10 '14 at 09:14
Ingo, I am using a licensed Jprofiler8. Am I eligible for 8.1 or there is a separate license fee for that? – TheMonkWhoSoldHisCode Jul 10 '14 at 09:23
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Opening heap snapshots with larger heap sizes than local memory will be much better with JProfiler 8.1, although it may still take a long time. Your license key will work with 8.1. – Ingo Kegel Jul 10 '14 at 11:46

Large HPROF file

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