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#1 (**permalink**) 01-17-2008, 05:34 AM

Hi all,
we need to start a Java application which needs about 3.8 Giga ram on a
HP UX 11.11.
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/jav...ng_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 ?
Thanks in advance
Francesco

#2 (**permalink**) 01-17-2008, 05:34 AM

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.

> 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/jav...ng_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.

Don

#3 (**permalink**) 01-17-2008, 05:34 AM

Hello,
thanks for your reply.

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

yes I agree. I should probably look for 64-bit binaries of JVM.

Anyone know if it's available Java 64 bit for Hp-UX ?
As far as I know it's available only on Solaris 64-bit/AMD64 and Linux
AMD64.......

regards
Francesco

Don Morris ha scritto:

> 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.
>
> > 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/jav...ng_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.
>
> Don

#4 (**permalink**) 01-17-2008, 05:34 AM

Francesco wrote:
> Hello,
> thanks for your reply.
>
>> That would be my strong suggestion. You're simply too close to the
>> insurmountable 32-bit architectural boundary.
>
> yes I agree. I should probably look for 64-bit binaries of JVM.
>
> Anyone know if it's available Java 64 bit for Hp-UX ?
> As far as I know it's available only on Solaris 64-bit/AMD64 and Linux
> AMD64.......
>
http://www.hp.com/products1/unix/jav...spot.html#-d64
suggests it is:

-d64 (SDK version 1.4 and later)
Runs Java in 64-bit mode. In HP SDK 1.4, interpreter and compiler -Xint,
-Xmixed, and -Xcomp modes are supported.

Don

> regards
> Francesco
>
>
>
>
> Don Morris ha scritto:
>
>> 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.
>>
>>> 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/jav...ng_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.
>>
>> Don
>

#5 (**permalink**) 01-17-2008, 05:34 AM

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@cxx.up.hp.com).

>> 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/jav...ng_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

#6 (**permalink**) 01-17-2008, 05:34 AM

Francesco wrote:
> Hello,
> thanks for your reply.
>
>> That would be my strong suggestion. You're simply too close to the
>> insurmountable 32-bit architectural boundary.
>
> yes I agree. I should probably look for 64-bit binaries of JVM.
>
> Anyone know if it's available Java 64 bit for Hp-UX ?
> As far as I know it's available only on Solaris 64-bit/AMD64 and Linux
> AMD64.......

Yes, 64-bit JVMs have been available on HP-UX for years. If it is
not explicitly stated on HP's Java pages, it is probably due to the
same attitude I first had, which was to think that this is a given.

<http://www.hp.com/go/java>

Eric

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