Eclipse MAT Parsing 11GB Heap dump - Out Of Memory. Unable to parse the heap dump

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I was trying to parse the 11GB heap dump using Eclipse MAT and I am getting the following error

  An internal error occurred during: "Parsing heap dump" 

I think the MAT is unable to parse such a huge heap dump. I read some posts and increase the VM configurations to more than 80% of the dump size. Following are my vm configurations

      -vmargs -Xms8192m -Xmx10240m 

and I am still not able to load the dump. I tried with ParseHeapDump.bat with no changes ...

Keep increasing Xmx till the JVM complains, then increase your swap file size, then increase Xmx again, etc.

At that stage it will take ages because it will be using disk as RAM.

[SOLVED] Eclipse MAT – Java heap space error – Better-Coding, Unable to open large hprof file, because of the exception shown below. An internal error occurred during: "Parsing heap dump from The heap size of Eclipse Memory Analyser Tool is not enough to parse a heap dump file. I have had simmilar issues and always it turned out that I did something wrong. The heap size of Eclipse Memory Analyser Tool is not enough to parse a heap dump file. Solution Go to Eclipse MAT home directory and edit MemoryAnalyzer.ini file.

I recently installed Eclipse MAT (Eclipse Memory Analyzer Version 1.9.1) on Mac OS Catalina (10.15.3). I needed to review a 4g heap dump. The default JVM heap size for MAT is 1024m.

I think the easiest way to increase the JVM's heap size is to use a shell window - go to the /Applications/mat.app/Contents/Eclipse/ folder. Then vi MemoryAnalyzer.ini and change -Xmx1024m to your required value, in my case I went with -Xmx10g.

To review the change, restart MAT and go to the help -> About Eclipse Memory Analyzer then click installation details, and look for the entry: eclipse.vmargs=-Xmx10g about 50 lines down.

An out of memory error has occurred during parsing heap dump, I was trying to parse the 11GB heap dump using Eclipse MAT and I am getting the following error An internal error occurred during: "Parsing heap dump" I think � settings work for all 32 bit heap dumps If you don't want to change your settings, I would recommend to download a separate RCP of MAT and try to parse your dump with this separate installation of MAT. (Here you have additionally the possibilty to parse the heap dump within the command shell with: "ParseHeapDump.bat <path to dump>".)

On the Windows install of Eclipse Photon, I got around the problem by updating the memory parameters in the eclipse.ini file. This was directly under my c:\eclipse folder.

-Xms6g 
-Xmx6g

I tried setting it to 4 gigs for a memory dump that was about 4.1GB and it failed. So, the rule of thumb is to set it to a higher value than the size of the memory dump.

Memory Analyzer � cannot load hprof file with heap dump , “Could not reserve enough space for object heap“ I installed the Eclipse Memory Analyzer in the Eclipse using “Software Updates and To get rid of the OOM during parsing the heapdump you should increase the memory separate RCP of MAT and try to parse your dump with this separate installation of� The Eclipse Foundation - home to a global community, the Eclipse IDE, Jakarta EE and over 350 open source projects, including runtimes, tools and frameworks.

MemoryAnalyzer/FAQ - Eclipsepedia, getting the following: An internal error occurred during: "Parsing heap dump from I have spent several hours trying to figure this out with no luck I have tried: SnapshotFactoryImpl.parse(SnapshotFactoryImpl.java:222) The size of the heap dump is around the same size as the configured max heap size JVM parameter. So if you have set your max heap size to -Xmx512m , your heap dump will be around that size. Analyzing the heap dump. Now you have the heap dump and want to figure out what was inside the heap at the moment the OOME occurred. There are several Java

1.1.2 Out of Memory Error while Running the Memory Analyzer; 1.1.3 How to run on 1.2.3 Parser found N HPROF dumps in file X. Using dump index 0. The Memory Analyzer needs a Java 1.5 VM to run (of course, heap dumps initial parse on a large machine, then copy the heap dump and index files� When you load a Heap dump for the first time, the MAT will index it. This make take a few minutes, but the results will be persisted so subsequent loads will be quick. 2. Understanding the Histogram. When you first acquire your heap dump, the MAT will show you an overview of the applications memory use.

The Eclipse Memory Analyzer is a fast and feature-rich Java heap analyzer that helps you find memory leaks and reduce memory consumption.. Use the Memory Analyzer to analyze productive heap dumps with hundreds of millions of objects, quickly calculate the retained sizes of objects, see who is preventing the Garbage Collector from collecting objects, run a report to automatically extract leak

Comments
  • I have more large heap dump, just create an ec2 instance to run mat in the vnc. In this case m1.xlarge or m3.2xlarge may be enough.
  • See also stackoverflow.com/questions/7254017/…
  • In general, you need more memory to parse the heap dump then is the size of the heap dump itself. 150% percent is usually enough in my experience.
  • After posting this question I tried with 12gb of heap and the dump processed but its taking very long to remove the unreachable objects. It started it since more than a day now and its still 34%. So my next question is how to speed up this process?