How to increase memory allowed for an application

Before in OS 9 and below we can expand the quantity of memory for an application, we can't do same in OS X.
OS X is able to set himself the amount of memory for an application. This seems to work but I think there is a limit sets by OS X.
My question is how to increase this amount of memory ?
I tried to increase it in terminal using "ulimit -d unlimited" but this is not working enough.
I use to do calculation with matrix systems and iterations in Mapple software but on my iMac with 4 GB of RAM memory, when application reaches 450 MB, I get a memory error message. Activity monitor at same time says there is more than 2 GB free !
Has somebody a solution to free this limit, even for a small time or for only an application ?
Thanks for your help.

The full message is :
"Kernel connection has been lost. The kernel returned the following message :
Execution stopped : Memory allocation failed.
Please sea ?alloc for more detail.
You should save this worksheet and restart Maple
Executing commands in Mapple requires a connection to the Maple kernel.
Firewalls have been known to cause problems with kernel connections in Maple. Please ensure that any firewall software is configured to allow Maple to create connections to the kernel. Consul the FAQ for more information."
I checked the firewalls of OS X, they are shutdown and no restrictions seems to be set for processes.
We are expecting for a new version of Maple with some modifications due to Snow.

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