25 Feb
2013
25 Feb
'13
10:57 p.m.
Hi,
I completely agree on increasing values on documentation. Obviously 96MB is
not sufficient anymore, even 128M, for sure. Minimum 128MB and recommended
192MB seem ok.
In the meantime, pushing a bit more on investigations is also a good idea,
even if I found your measurements a bit high. From the thread dumps I've
done, I don't remember seeing so mush used memory, even for Home page...
Good luck with that! :-)
Guillaume Fenollar
2013/2/25 Vincent Massol <vincent(a)massol.net>
Hi,
I'm going to increase the permgen to 192MB for now since we need XWiki to
work and I've raised
http://jira.xwiki.org/browse/XWIKI-8853
Thanks
-Vincent
On Feb 25, 2013, at 3:01 PM, Vincent Massol <vincent(a)massol.net> wrote:
Hi devs,
Right now we recommend this on
http://platform.xwiki.org/xwiki/bin/view/AdminGuide/Installation#HPrerequis…:
"A minimum of 300MB of heap memory and 96MB
of permGen. Recommended
values are above 512MB for the heap and 128MB for the
permGen (-Xmx512m
-XX:MaxPermSize=128m)"
I've discovered on
http://ci.xwiki.org/job/xwiki-enterprise-test-extension/org.xwiki.enterpris…
we had an OOM and it seems to happen more and in more in our
functional tests on CI. Something we've done must have increased our
permgen memory.
I've done some measurements with yourkit and here's what I found:
* After XWiki is started and before any page is called we already use
64MB of
permgen
* After calling the home page, the permgen used
goes to 101MB
* After calling a page using the code macro, the permgen goes to 132MB
So it seems that your default value of 96MB and recommended value of
128MB are not
enough…
BTW forcing garbage collection reduces from 132MB to 130MB (not much).
We need to either find what is taking all our permgen memory or if it's
legit
increase our recommendations and the default value we use in
start_xwiki.sh/bat
Any idea?
My hunch tells me the Extension Manager could be the cause.
Thanks
-Vincent
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