Publishing i-models user may get the following error:
Fatal Error – Insufficient heap memory to complete current operation – application will exit.
There are many reasons for this. The most common is running out of memory or software is hitting a resource limit while publishing i-model.
Try publishing larger referenced files separately. In Bentley i-model Composer open single file -> publish to i-model. After you have references already published to i-models then open master file and publish it. At this step Bentley i-model Composer takes existing i-models of referenced file and saves some memory.
Minimize Unnecessary Demand on Resources
Close unnecessary applications.
Bentley i-model Composer is a x32 bit application. Review the following links explaining the memory usage for MicroStation (the same applies to Bentley i-model Composer)
MicroStation Memory Management
Enabling Lock Pages In Memory Under Windows 7 and Vista