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Update of BG/Q Software to V1R2M2

Recompiling Applications and Tools


It is recommended that applications be recompiled after installing a new release of Blue Gene/Q software.
By recompiling your application for the new release, you ensure that your application will take advantage of the new features contained within the release.


Some examples would be improvements in the Message Passing Interface (MPI) libraries.
There are functional and performance enhancements to MPI in each release, and recompiling your applications will link to the latest libraries. Also, there are compiler optimizations that can result in more efficient code, and you should recompile to take advantage of these improvements.

Changed behavior of exit()


In V1R2M2, the user can change the behavior of the exit() system call.
All tasks must exit(n) before the job is considered finished, except for n=1 which will end the job immediately.
If the application would prefer to end the job upon the first non-zero exit() call, the user can specify the following environment variable: BG_EXITIMMEDIATELYONRC=1.


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