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Forum: Glassfish Administration 12-12-2011, 16:11
Replies: 11
Views: 23,791
Posted By guus
You'll be surprised how easy it is to analyse a...

You'll be surprised how easy it is to analyse a 2GB heap (I know I was). Forget all of the jmap tinkering, and have a look at http://eclipse.org/mat/ - I've found it to be exceptionally useful: after...
Forum: Glassfish Administration 12-12-2011, 15:55
Replies: 11
Views: 23,791
Posted By guus
Hi cfd, You mention it takes a couple of...

Hi cfd,

You mention it takes a couple of hours for the OOMs to return. That might indicate that there's some room for (small) improvements. If during those hours the load on the application didn't...
Forum: Java Administration 13-06-2011, 15:55
Replies: 6
Views: 7,328
Posted By guus
The generic problem is described by Frank Kieviet...

The generic problem is described by Frank Kieviet in one of his blogposts on the subject:



He provides a lot of background on issues like this. The quote above was taken from this blogpost:...
Forum: Java Administration 13-06-2011, 07:38
Replies: 4
Views: 6,101
Posted By guus
Hi Kees Jan, I have limited info on cache...

Hi Kees Jan,

I have limited info on cache efficiency - for most caches, I can lookup hit, miss and update counts. So yes, I'll be able to do some comparison before and after I make changes.
...
Forum: Java Administration 12-06-2011, 23:10
Replies: 4
Views: 6,101
Posted By guus
Sadly, I did not compare GC-times. As...

Sadly, I did not compare GC-times. As Java-Monitor doesn't allow me to review data older than two days, I won't be able to do that anymore either.

Currently, heap usage is moving up and down...
Forum: Java Administration 11-06-2011, 11:14
Replies: 4
Views: 6,101
Posted By guus
What happens if your objects can't die young

http://java-monitor.com/postedimages/ad250961-19b8-4d66-8da5-99821cafec44.png

This one had me puzzled for a while. I thought I'd share this with you.

As you can see, heap usage started to...
Forum: Solving Programmatic Problems 25-05-2011, 20:02
Replies: 8
Views: 22,775
Posted By guus
As I read the documentation, it is mainly the...

As I read the documentation, it is mainly the type of traffic, not the sheer size of the cache, that introduces the maintenance overhead (more inserts, less selects == more cache maintenance). Sizing...
Forum: Solving Programmatic Problems 25-05-2011, 19:53
Replies: 8
Views: 22,775
Posted By guus
On a side note: 32MiB is "quite a chunk of...

On a side note: 32MiB is "quite a chunk of memory" according to you. Am I missing an important detail here (is this 32MiB per thread, process or something like that)?

Don't get me wrong, I love...
Forum: Openfire Administration 17-04-2011, 09:17
Replies: 3
Views: 14,002
Posted By guus
Both Http Bind (Bosh) and MUC (multi-user chat)...

Both Http Bind (Bosh) and MUC (multi-user chat) are known memory hogs in Openfire 3.7.0 (and in older versions, for that matter. Another likely candidate is PEP / Pubsub. If your XMPP domain makes...
Forum: Java Administration 17-02-2011, 12:55
Replies: 3
Views: 42,247
Posted By guus
A slightly less intimidating tool than awk is...

A slightly less intimidating tool than awk is Ingo Rockels "Thread Dump Analyzer" on http://java.net/projects/tda (note the webstart link on the left - the rest of the homepage got deleted after the...
Forum: Java Administration 07-01-2011, 10:38
Replies: 5
Views: 7,908
Posted By guus
In addition to what Kees Jan writes: be aware...

In addition to what Kees Jan writes: be aware that there's some overhead related to using databases that are likely not to be included in the statistics generated by your DBMS. Setting up socket...
Forum: Java Administration 23-01-2010, 15:31
Replies: 24
Views: 19,686
Posted By guus
There appears to be a problem in your setup that...

There appears to be a problem in your setup that involves code from the Smack library. Smack isn't used by Openfire itself, so I assume that you have a plugin that uses Smack internally. I have...
Forum: Java Administration 24-07-2009, 11:13
Replies: 4
Views: 65,776
Posted By guus
That MBean shows me slightly different values for...

That MBean shows me slightly different values for max, committed (both 532742144) and init (536870912). Xmx and Xms have been set to 512m. The value for committed doesn't change for me though (not...
Forum: Java Administration 22-07-2009, 17:09
Replies: 4
Views: 65,776
Posted By guus
Interesting find. How do you measure the...

Interesting find. How do you measure the committed value?

If I hook up jconsole to my Eclipse instance that has Xmx and Xms set to the same value, the 'committed' value (in the textbox on the...
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