You are using a 32 bit operating system and a 32 bit processor. To make
more than 4GB of ram available you must ensure that you have PAE support
enabled in your kernel (search Google for Physical Address Extension)
which may mean re-compiling for RHEL 4 (see Red Hat). Your processor may
not support it but I'd suspect that when you say 4 processors you
probably mean 4 cores and I believe all 4 core Intel CPUs do support
PAE. Re-reading your email I see that you say that you have 4.5G of free
memory - how did you determine this? 'top'?
Even so, I cannot find any clear statement on the web that the 32 bit
JRE will be able to address more than 4G even if you do have PAE
enabled. I suspect not. Actually, 'suspect' is way too mild a term ... I
would be completely astounded if you could...
Possible workarounds are:
1. Try running 2 JVMs ( when you have PAE enabled) - of course this may
not work in your application (you'd have to have two Tomcat instances.)
2. Your other 'workaround' is to install a 64 bit OS and a 64 bit JVM.
Then you can have 7G+ for the JVM.
Regards
Alan Chaney
Li,Henry wrote:
My Tomcat is running on 32-bit Red Hat 4 (2.6.9-78.0.1.ELsmp), host server has
8G physical memory and 4 processors.
java version "1.4.2" gcj (GCC) 3.4.6 20060404 (Red Hat 3.4.6-10)
I got java.lang.OutOfMemoryError
Current configuration: -Xms1024M -Xmx2304M
The host server has about 4.5G free memory. When I tried to increase -Xmx2304M
to -Xmx3000M, I got this error:
Error occurred during initialization of VM, Could not reserve enough space for
object heap
The maximum # I can reach is -Xmx2680M.
QUESTION: Is there an upper limit for -Xmx? What is the work around? How can I
use my free memory on the server to
get rid of the OutOfMemoryError?
Thanks,
Henry
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