From: d b karron (karron++at++casi.net)
Date: 07/15/2004 11:26:39
Is there still a 2 gig limit on performer and arena shared memory
allocations ? We found even with the -64 mode and IRIX64 kernel we could not
get the old Arena shared memory package to allocate more than 2 gig of
memory.
We did find mmap64 and uscreate/usmalloc did work for allocations up to
(that we have tested) 72 gig (not all at once).
I have not re-tested this in IRIX 6.5.23; I ran into this problem in 6.5.19
and made my own work arounds
How does performer work with very big allocations or allocation pools >2 gig
?
-----Original Message-----
From: owner-info-performer++at++performer.engr.sgi.com
[mailto:owner-info-performer++at++performer.engr.sgi.com] On Behalf Of Don Burns
Sent: Thursday, July 15, 2004 12:17 PM
To: Alan Gifford
Cc: info-performer++at++sgi.com
Subject: Re: [info-performer] Creating objects in shared memory
You need to overload the new() operator in your object and call pfMalloc()
within the new() operator. This will allocate the memory in the shared
memory arena.
You must also, however, initialize any pointers you want to use in your
child processes before pfConfig(). Or, alternatively, allocate a
structure that will contain shared pointers using pfMalloc() before
pfConfig().
-don
On Wed, 14 Jul 2004, Alan Gifford wrote:
> I don't know a lot about multiprocessing, but I am trying to get a
> Performer app to spawn a child process which computes values for use in
> position of graphics objects. I have a problem in that I don't know how
> to create my own C++ objects in the shared memory. Everything I find on
> the Internet is about creating the Performer objects in shared memory,
> and not objects that I create myself.
>
> The child process that I'm creating has to have access to these objects,
> because it is the object itself which does the calculation. Does anyone
> have an example or a description of how this is done? I am really stuck
> here, and searching the Net is not helping me out at all.
>
> Thanks a bunch.
>
> Alan
>
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