CCLOutOfMemoryError while building cubes in Unix

[mycognos]

Hi

I am getting 'CCLOutOfMemoryError' while building some of the cubes in unix. The cube models are actually migrated from 7.3 version trasnformer to 8.4 version, and these were building in Dev environment without any issues and when we migrated to SIT the cubes started giving the error.We are generating categories in from windows and moving the mdl files to unix, then converting the mdl to pyj before building it. The model size comes around 50 MB.
The error occures at the "COMMITTING POWER CUBE" stage(when we check the log) and the process is getting killed when the error comes.
Can anyone tell me what the issue is? Is that something related to model size/memory allocation in server?

Thanks in advance..