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error in instructions: no way to get HPROF from Sun JVM 1.5 [message #7209]

Wed, 19 November 2008 19:27

Paul E. Keyser
Messages: 878
Registered: July 2009

Senior Member

WinXP; Eclipse 3.3

The instructions say to use the JVM parameter "-XX:+HeapDumpOnCtrlBreak"

I tried that with the Sun JVM whose version is immediately below:
java version "1.5.0_11"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_11-b03)
Java HotSpot(TM) Client VM (build 1.5.0_11-b03, mixed mode)

And got this fatal error:
Unrecognized VM option '+HeapDumpOnCtrlBreak'

Is there any other way to do it?

-Paul

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Re: error in instructions: no way to get HPROF from Sun JVM 1.5 [message #7551 is a reply to message #7209]

Thu, 20 November 2008 06:54

Andreas Buchen
Messages: 111
Registered: July 2009

Senior Member

Hi Paul,

getting a heap dump really depends on VM version and OS platform. If you
running a 1.5er Sun VM on Windows, the only reliable way to get a heap
dump is using the HeapDumpOnOutOfMemoryError flag. The HeapDumpOnCtrlBreak
flag works only with the 1.4er VMs.

I usually do it this way: run the 1.6er VM, connect via JConsole and hall
dumpHeap from the HotSpotDiagnostics MBean.

Andreas.

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Re: error in instructions: no way to get HPROF from Sun JVM 1.5 [message #7797 is a reply to message #7551]

Tue, 25 November 2008 12:35

Taras Tielkes
Messages: 38
Registered: July 2009

Member

Hi Andreas,

HeapDumpOnCtrlBreak works on Sun 1.5 VM as well, but only starting from
1.5 update 14.

There's still a bug in the Sun VM implementation caused by erroneously
parsed source control comments. It's possible to work around that
easily, however.

See here for more details:
http://forums.sun.com/thread.jspa?threadID=5179031

-tt

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Re: error in instructions: no way to get HPROF from Sun JVM 1.5 [message #7817 is a reply to message #7797]

Tue, 25 November 2008 17:02

Andreas Buchen
Messages: 111
Registered: July 2009

Senior Member

Sweet. I didn't know this. We are running a patched version of the 1.5er
HotSpot VM which supported the option all the time. I'll update the WIKI
accordingly. Thanks! Andreas.

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