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Memory analyzer not opening hprof [message #1059461]

Sat, 18 May 2013 20:07

Eclipse User

I am new to mat, and I am having some issues. I ran the command:

ant run-tests

my build.xml contains the following:
<target name="run-tests">
<junit fork="yes" printsummary="withOutAndErr">
<formatter type="plain" usefile="false" />
<test name="CLASSNAME"/>
<classpath refid="Compiler.classpath"/>
<jvmarg value="-XX:-HeapDumpOnOutOfMemoryError"/>
<jvmarg value="-XX:HeapDumpPath=/mnt/hgfs/RAM/dumps.hprof"/>
</junit>
</target>

and I get a out of memory exception. The file dumps.hprof is created, but when I try to open it in eclipse memory analyzer I get an error. I have attached the hprof (as .rar it's too big) and the .log. Any help would be appreciated.

Attachment: dumps.rar
(Size: 940.20KB, Downloaded 409 times)
Attachment: .log
(Size: 2.64KB, Downloaded 468 times)

Re: Memory analyzer not opening hprof [message #1060603 is a reply to message #1059461]

Mon, 27 May 2013 05:38

Eclipse User

The dump is corrupt:

!MESSAGE (Possibly) Invalid HPROF file: Expected to read another 308,909,576 bytes, but only 43,679,837 bytes are available.

Do you usually get bigger heap dumps?
jhat reads the dump but also warns:

WARNING: Unexpected EOF. Will miss information...

Can you try running your tests with a more recent JVM?

I suppose Memory Analyzer could be enhanced to attempt to read a truncated dump, but I'm not sure how useful the result would be.

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