Eclipse Community Forums: Memory Analyzer (MAT)

Home » Archived » Memory Analyzer (MAT) » Stuck on 63%

Mon, 25 August 2008 13:16

Eclipse User

Originally posted by: tweakmonkey78.hotmail.com

I have an 800MB dump and I'm running the standalone Memory Analyzer with
-Xmx1340M but the this doesn't seem to be enough as it always gets stuck
at 63% complete with the CPU at 99%. So after about 20 minutes at 63% I
always kill the process.

What I'd like to know is am I doing something wrong? And when will there
be a ScriptParseHeapDump.bat and console mode the way there was in the old
SAP version? All I want to do is get the dump parsed once!

Cheers

Re: Stuck on 63% [message #3223 is a reply to message #3187]

Mon, 25 August 2008 15:35

Eclipse User

Tweakmonkey wrote:

> I have an 800MB dump and I'm running the standalone Memory Analyzer with
> -Xmx1340M but the this doesn't seem to be enough as it always gets stuck
> at 63% complete with the CPU at 99%. So after about 20 minutes at 63% I
> always kill the process.

The size of the dump is not really relevant, it's the number of objects.
The number of objects hurts when transforming the object graph into the
dominator tree... So if this case does not exhibit a large number of
objects, let me know. A rule of thumb is 30 million should be okay on
32bit, but it also depends on the shape of the graph.

With the latest version, you should be able to say on the command line:

MemoryAnalyzer.exe -application org.eclipse.mat.api.parse <path/to/heap>

Be sure to specify the max memory, if possible by adding: -vmargs -Xmx1304M

Andreas.

And thanks for the script hint... I will add one for the parsing.

Re: Stuck on 63% [message #3323 is a reply to message #3223]

Tue, 26 August 2008 10:03

Eclipse User

Originally posted by: tweakmonkey78.hotmail.com

Andreas Buchen wrote:

> The size of the dump is not really relevant, it's the number of objects.
> The number of objects hurts when transforming the object graph into the
> dominator tree... So if this case does not exhibit a large number of
> objects, let me know. A rule of thumb is 30 million should be okay on
> 32bit, but it also depends on the shape of the graph.

> With the latest version, you should be able to say on the command line:

> MemoryAnalyzer.exe -application org.eclipse.mat.api.parse <path/to/heap>

Thanks - I really like being able to parse the dump from the command line.

I left it running yesterday evening and it finished in just over 2 hours.
There are 25.5M objects. I'm puzzled why it takes so long as my old
version 1.1.1 of SAP Memory Analyzer (using ScriptParseHeapDump.bat) could
do it in 12 minutes.

Anyway at last I can use the GUI and I must say it's superb. Keep up the
good work!

Re: Stuck on 63% [message #5987 is a reply to message #3187]

Wed, 29 October 2008 21:29

Eclipse User

Originally posted by: eclipse_org.414n.net

I ran into the same problem. My heap dump was 1.5G with 19 million
objects.

I looked at the thread stack traces with JConsole and one of the workers
was stuck at org.eclipse.mat.collect.SetInt.add.

I replaced the implementation of SetInt with IntHashSet from
http://www.sosnoski.com/opensrc/tclib/
I renamed it, added an iterator and toArray method, compiled it plus its
two ancestor classes, and dropped it in the jar file.

After this it analyzed the heap dump in maybe 5 minutes.

Aside from this issue, I really like the tool. The UI and analysis modes
are good and the memory usage is 1G vs 8G or more for the others I have
tried.

Re: Stuck on 63% [message #6356 is a reply to message #5987]

Thu, 30 October 2008 03:58

Eclipse User

> I looked at the thread stack traces with JConsole and one of the workers
> was stuck at org.eclipse.mat.collect.SetInt.add.

Hi, yes, we had a problem with the primitive set implementation. I fixed
this some time ago and the performance numbers increased significantly.

What version of the Memory Analyzer are you using? Can you post the exact
plug-in version, e.g. 0.7.0.2008mmyy? I'd like to know if I have to take
another look at it.

Thanks, Andreas.

Re: Stuck on 63% [message #6539 is a reply to message #6356]

Thu, 30 October 2008 18:47

Eclipse User

Originally posted by: eclipsebugs.414n.net

I used the RCP app on the download page (Win32 x86)
http://www.eclipse.org/downloads/download.php?file=/technolo gy/mat/0.7/rcp/MemoryAnalyzer-Incubation-0.7.0.20081008-win3 2.win32.x86.zip

Re: Stuck on 63% [message #6577 is a reply to message #6539]

Fri, 31 October 2008 03:47

Eclipse User

faffer wrote:

> I used the RCP app on the download page (Win32 x86)
>
http://www.eclipse.org/downloads/download.php?file=/technolo gy/mat/0.7/rcp/MemoryAnalyzer-Incubation-0.7.0.20081008-win3 2.win32.x86.zip

Ok, thanks for the info. The October version includes the fix for the
SetInt. If this is still not performing well, I will benchmark it with the
library you are using. Thanks.

Previous Topic:	JVM Terminates immediately under Mac OS X w/ J2SE 6.0
Next Topic:	Performing query within dominator subgraph

Goto Forum:

-=] Back to Top [=-

Current Time: Sat Jul 26 15:32:15 EDT 2025

.:: Contact :: Home ::.

Breadcrumbs

Sign up to our Newsletter