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My job runs ok in small scale, but fails with segmentation fault when it goes to larger scale. What may be wrong?

April 26, 2017fails fault Job larger Ok scale segmentation small

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My job runs ok in small scale, but fails with segmentation fault when it goes to larger scale. What may be wrong?

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As you scale out, MPI is going to need more memory for buffers [depending on your communication pattern]. The application may also need more memory at scale. You may try some tests with ppn=6 or ppn=4 instead of ppn=8, or specify the himem resource so that each process can access more memory.