I put Lambda Probe (http://www.lambdaprobe.org/d/index.htm) on the web
server to monitor some of the memory usage. Here's what I'm finding
after 20 minutes of running. Keep in mind this is without SSL enabled.
Name Usage score Plot Used Committed Maximum Initial
Group
Tenured Gen 129.73Mb 138.86Mb 945.25Mb 118.19Mb HEAP
Perm Gen 45.88Mb 46.00Mb 64.00Mb 12.00Mb
NON_HEAP
Survivor Space 957.74Kb 1.13Mb 7.88Mb 960.00Kb HEAP
Code Cache 12.19Mb 12.22Mb 32.00Mb 192.00Kb NON_HEAP
Eden Space 6.75Mb 9.38Mb 63.00Mb 7.94Mb HEAP
Total 195.48Mb 207.58Mb 1.09Gb 139.25Mb TOTAL
Everything is running fine at the moment but I'm a little concerned
about Perm Gen and the space we have allocated for it. I imagine that
it's possible, with SSL enabled, that the space is being used up. Is
there enough overhead with SSL to have this scenario? I did some
reading on Perm Gen and we do use an extensive about of Hibernate in
this application, and it's JSF based.
Chris Stewart
cstewart...@gmail.com
On Apr 28, 2009, at 10:56 AM, Mark Thomas wrote:
Chris Stewart wrote:
Over the weekend we added SSL security to a Tomcat 6 instance that
has
been running for awhile without error. This morning, after the
number
of sessions increased on the machine, Tomcat began throwing 500
errors
to users. I checked the logs and found an instance of OutOfMemory,
followed by dozens of errors related to Google Guice attempting to
start new threads. I can only image that with the addition of SSL,
more memory is being used by more threads being created, or some such
situation. I'm not terribly sure where or how the extra resources
are
being used.
I was hoping that those with the experience of using SSL on Tomcat
could point me in some direction on places to look for clues. At the
moment I'm not sure where the issue could be. Here are a few of the
statistics about our setup and configuration:
-XX:ThreadStackSize=512
Initial Memory Pool: 128MB
Maximum Memory Pool: 1024MB
Thread Stack Size: 512KB
Tomcat version? OS vendor/version? OS memory? JVM vendor version?
Connector
settings in server.xml?
I've been adjusting these in various ways to attempt to at least find
a path towards success. So far, about 5 minutes after the server is
restarted the performance begins to plummet.
Grab yourself a profiler and see what is using the memory.
Mark
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