Full GC Occuring every 1 minute

Question

Hi there,
My Weblogic 5.1 (service pack 10) seems to be running a full gc every 1 minute even though I have plenty of memory and there is not much traffic on my web site.
The full gc is causing me ~9 seconds of pause time every minute for the ~300M of memory that I have used up on a maximum of 768M for the JVM.
If you know of a way to disable this feature, please kindly let me know!
Thanks in advance for your help!
Regards,
Wing.

Answer 1

Thanks Simon,
When you say debug mode, do you mean development mode as opposed to production
mode, i.e. -Dweblogic.ProductionModeEnabled=false?
Paul
"Simon Spruzen" <[email protected]> wrote:
>
WLS dgc does call System.gc() every so often. But you do have to have
debug mode
enabled. Some of the ZAC code does too. I don't know why.
simon.
"Paul Hammond" <[email protected]> wrote:
I have the same problem, 2.5 secs FULL GC for every 40 meg, and about
once a minute
or thereabouts seems about right, not right on the second are anything
but about
right. This is a severe problem alright, especially as even with a 1.5
gig heap,
and only 140 meg used, it still insists on doing one when it doesn't
need to!!
I'm on Solaris 2.8, WL 6.1 SP2.
Maybe WL (could BEA engineers confirm?) explicitly calls a garbage collection
every so often? Would this always do a full GC? There is an option (non
standard
or supported) option to Sun's JVM which is -XX:+DisableExplicitGC which
will ignore
explicit calls to do a GC. It might be worth trying this to see if it
then only
does a full GC when it has to.
Regs,
Paul
Regs,
Paul
Dimitri Rakitine <[email protected]> wrote:
If this is that periodic (exactly once a minute), can it be WebLogic
DGC
implementation? I think there is a property which turns it on or off.
Cameron Purdy <[email protected]> wrote:
Figure out who is calling GC ... is it because the memory is used
or
because
someone calls it.
Also increase the "new" heap size to limit the GC pause.
Peace,
Cameron Purdy
Tangosol, Inc.
Clustering Weblogic? You're either using Coherence, or you should
be!
Download a Tangosol Coherence eval today at http://www.tangosol.com/
"Wing Lam" <[email protected]> wrote in message
news:[email protected]...
Hi there,
My Weblogic 5.1 (service pack 10) seems to be running a full gc
every
1
minute even though I have plenty of memory and there is not much
traffic
on
my web site.
The full gc is causing me ~9 seconds of pause time every minute
for
the
~300M of memory that I have used up on a maximum of 768M for the
JVM.
If you know of a way to disable this feature, please kindly letme
know!
Thanks in advance for your help!
Regards,
Wing.--
Dimitri