On Libra, how can I run a job that requires more than 2GB of memory?

To run a program that requires more than 2GB of memory on the Libra Cluster, you need to compile the program in 64-bit mode to go over the 2GB virtual memory limit. Use the following compiler flag with xlc or xlf compilers:

The flag -b64 is a linker flag, while the -q* options are compiler flags.

Note: If the library that your program references does not have 64-bit support, this won't work.