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Batch nodes: 32 cpus 5x faster than 33 cpus

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This is the way I typically submit batch jobs:

qsub -l select=1:ncpus=40 rl-myjob

Ever since the Memorial Day weekend maintenance, jobs submitted this way have been running about 5 times slower than than they do on the login node. I traced the problem to ncpus values greater than 32. For example, on a small test that uses 64 threads and normally runs in under 30 seconds:

qsub -l select=1:ncpus=32 rl-myjob
# Finishes in about 24 seconds

qsub -l select=1:ncpus=33 rl-myjob
# Takes over 120 seconds


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