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List:       openjdk-hotspot-gc-use
Subject:    hotspot-gc-use Digest, Vol 20, Issue 6
From:       aaisinzon () guidewire ! com (Alex Aisinzon)
Date:       2009-08-17 16:58:14
Message-ID: BF1AA7231657174881389A59FBB4EB7C017E19CE () newexchange ! guidewire ! com
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Hi Shane

The best tool I have found so far (and I have looked hard) is the IBM
Support Assistant.
That tool is like an IDE where you can download many plugins. One of
them is a garbage collection analyzer. I have used successfully up to
Sun JVM 1.5 (and IBM JVMs too, obviously).
I would typically use the following options for the Sun JVM:
"-XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintHeapAtGC
-XX:+PrintGCApplicationConcurrentTime
-XX:+PrintGCApplicationStoppedTime"
I have noticed that this tool (along with others) would choke on the
first couple of lines in the GC logs. I need to remove all lines before
the first "useful entry" aka "{Heap before gc invocations=1:"
Then, the tool would work great.

Let me know if this helps

Alex Aisinzon
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Subject: hotspot-gc-use Digest, Vol 20, Issue 6

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Today's Topics:

   1. GC log parsing tools (Shane Cox)


----------------------------------------------------------------------

Message: 1
Date: Fri, 14 Aug 2009 17:53:31 -0400
From: Shane Cox <shane.cox at gmail.com>
Subject: GC log parsing tools
To: hotspot-gc-use at openjdk.java.net
Message-ID:
	<dc6011320908141453g3def4c5bk79439cddb0becab7 at mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"

I was wondering if someone could recommend tools that parse GC log files
and
report statistics (gc counts, pause time, bytes promoted, etc.)  I've
used
GC Portal in the past, but it doesn't seem to support all formats/syntax
produced by 1.6 VMs.  My objective is to compare GC logs from different
benchmarks/tests to determine optimal gc settings.

Thanks
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