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Posted to users@tomcat.apache.org by fachhoch <fa...@gmail.com> on 2013/05/21 16:53:30 UTC
permgen space increases every day
My application running on tomcat ,every day I see an increase in permgen
space, does this ever garbage collected? how can I see whats in the permgen
space? I guess Heap dump shows whats in the heap memory, how about permgen
space , I want to know why its increasing everyday?
Tomcat 6.35 jdk 1.6
Note# I am not redeploying any application in tomcat and I just have my app
and not even the manager app.I always restart the server if I have to
redeploy my app.
Please advice .
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Re: permgen space increases every day
Posted by fachhoch <fa...@gmail.com>.
Thanks for the reply.
do you ever actually run out of
PermGen space, or are you just particularly worried about it happening?
Yes I did ran out of PermGen space.
So I am checking frequently whats the perm gen size and I see its
increasing every day.
Thanks I will try out you suggestion.
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Re: permgen space increases every day
Posted by Christopher Schultz <ch...@christopherschultz.net>.
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Facchoch,
On 5/21/13 12:23 PM, fachhoch wrote:
> Thanks for your replies, I use spring , hibernate , wicket. For
> some of my objects I create proxy using spring, hibernate
> creates proxies and injection into wicket objects uses spring
> proxy. I also use groovy with spring and most of my groovy
> beans are of scope prototype.
>
>
>
> <lang:groovy id="someId"
> script-source="classpath:com/../..LeadAnlystReturnedAssignmentEmail.groovy"
>
>
scope="prototype" />
I think it's memory profiler time. The good news is that you should be
able to do it all for free (i.e. no cash).
First, read about how to enable profiling directly in the JVM:
http://docs.oracle.com/javase/7/docs/technotes/samples/hprof.html
(Hint: you want the heap=dump or heap=all options)
Or, you can take a heap snapshot (probably easier) using jmap like this:
$ jmap -dump:live,format=b,file=heap-dump.hprof.bin [pid]
(Where [pid] is of course the process id of your JVM)
Once you have a .hprof file, you can either try to use HAT (which
while providing lots of useful information is not terribly intuitive)
or you can use Eclipse's Memory Analyzer Tool (which I've never used,
but I have heard that it is fantastic).
I personally use YourKit (full disclosure: YourKit gives free licenses
to ASF committers so I have a free license) which I find quite good.
> Whats the best way I can force tomcat to garbage collect my
> permgen, I am running tomcat with -Xmx1024m -Xmx1024m
> -XX:MaxPermSize=1024m
Any full GC will clean PermGen as much as possible. Unless disabled,
calling System.gc() should request a full GC, but it's not guaranteed.
Enable GC logging to find out what is being collected and when.
I suspect that if you are seeing PermGen free-space shrink all the
time and full GCs are occurring (they do happen, though infrequently
as they are kind of time-consuming) then you are really just filling
it up with "useful" stuff.
The question is: how can you reduce it so used-PermGen doesn't grow
without bound.
You never answered my question: do you ever actually run out of
PermGen space, or are you just particularly worried about it happening?
- -chris
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Re: permgen space increases every day
Posted by fachhoch <fa...@gmail.com>.
Thanks for your replies, I use spring , hibernate , wicket.
For some of my objects I create proxy using spring, hibernate creates
proxies and injection into wicket objects uses spring proxy.
I also use groovy with spring and most of my groovy beans are of scope
prototype.
<lang:groovy id="someId"
script-source="classpath:com/../..LeadAnlystReturnedAssignmentEmail.groovy"
scope="prototype" />
Whats the best way I can force tomcat to garbage collect my permgen, I am
running tomcat with
-Xmx1024m -Xmx1024m -XX:MaxPermSize=1024m
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Re: permgen space increases every day
Posted by Jess Holle <je...@ptc.com>.
Note:
If you use various things like RMI and CMS GC and don't set one or two
key properties you'll always have a perm gen leak.
It's a nice feature of CMS :-)
On 5/21/2013 10:44 AM, Christopher Schultz wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA256
>
> Fachhoch,
>
> On 5/21/13 10:53 AM, fachhoch wrote:
>> My application running on tomcat ,every day I see an increase in
>> permgen space
> What was PermGen usage after your webapp reached a steady-state
> (usually a few minutes after launch)? How much does it grow every day?
> Have you ever run out of PermGen or are you just concerned that you
> /might/ run out?
>
>> does this ever garbage collected?
> Yes.
>
>> how can I see whats in the permgen space?
> Use a memory profiler.
>
>> I guess Heap dump shows whats in the heap memory, how about
>> permgen space , I want to know why its increasing everyday?
> I believe heap dump does give you PermGen info, but the "mat" tool
> might not be great for visualizing it.
>
>> Tomcat 6.35 jdk 1.6
>>
>> Note# I am not redeploying any application in tomcat and I just
>> have my app and not even the manager app.I always restart the
>> server if I have to redeploy my app.
> That is good information to have. Do you do anything with RMI or use a
> lot of proxy classes or anything like that? PermGen is mostly filled
> with java.lang.Class objects. The more classes you have loaded, the
> more PermGen you need. If you generate lots of on-the-fly Class
> objects and their instances don't get collected, then the
> java.lang.Class objects stick around forever and fill-up your PermGen.
>
> - -chris
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Re: permgen space increases every day
Posted by Christopher Schultz <ch...@christopherschultz.net>.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
Fachhoch,
On 5/21/13 10:53 AM, fachhoch wrote:
> My application running on tomcat ,every day I see an increase in
> permgen space
What was PermGen usage after your webapp reached a steady-state
(usually a few minutes after launch)? How much does it grow every day?
Have you ever run out of PermGen or are you just concerned that you
/might/ run out?
> does this ever garbage collected?
Yes.
> how can I see whats in the permgen space?
Use a memory profiler.
> I guess Heap dump shows whats in the heap memory, how about
> permgen space , I want to know why its increasing everyday?
I believe heap dump does give you PermGen info, but the "mat" tool
might not be great for visualizing it.
> Tomcat 6.35 jdk 1.6
>
> Note# I am not redeploying any application in tomcat and I just
> have my app and not even the manager app.I always restart the
> server if I have to redeploy my app.
That is good information to have. Do you do anything with RMI or use a
lot of proxy classes or anything like that? PermGen is mostly filled
with java.lang.Class objects. The more classes you have loaded, the
more PermGen you need. If you generate lots of on-the-fly Class
objects and their instances don't get collected, then the
java.lang.Class objects stick around forever and fill-up your PermGen.
- -chris
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