Re: Running huge Java application on HP-UX ?

Don Morris wrote:
Francesco wrote:
Hi all,
we need to start a Java application which needs about 3.8 Giga ram on a
HP UX 11.11.

man chatr (you're looking for +q3p +q4p options). And good luck... that
only leaves you 200Mb for private versions of shared libraries, stack
and text. I really doubt you'll get it... but make sure maxssiz is low
(Java usually recommends a very large one) -- maxssiz is always reserved
from your private virtual address space... so it implicitly limits heap.

I would not recommend using chatr on HP-provided java binaries.

I believe our JVM team already ships chatr'ed versions of java
that get invoked according to the -mx setting. Unfortunately I am
not expert there.

It might be an appropriate question for the hpux-devtools mailing list
(hpux-devtools@xxxxxxxxxxxxx).

Unfortunately when I start the application the JVM with the option
-mx3800M I get an error because memory cannot be reserved.

I found some docs which talk about it....
http://www.hp.com/products1/unix/java/infolibrary/prog_guide/expanding_memory.html


but the application still doesn't start up.

Anyone knows if there are patches that allow an application to run with
this heap ?
or do I have to move to the 64-bit ?

That would be my strong suggestion. You're simply too close to the
insurmountable 32-bit architectural boundary.

And if it is a pure Java application, it should not be cause
for too much worry. The one caveat is that memory usage will
then increase further, probably beyond 4GB.

Eric


Don
.

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