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Opened Jan 15, 2020 by Rob Latham@robl
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busy-spin latency on cooly really high

This command takes longer than 20 minutes to run on Cooley:

mpirun -f $COBALT_NODEFILE -n 2 numactl -N 1 -m 1 ./margo-p2p-latency -i 100000 -n "ofi+verbs;ofi_rxm://mlx5_0:3339" -t 0,0

The corresponding test in the no-spin case is shorter:

mpirun -f $COBALT_NODEFILE -n 2 numactl -N 1 -m 1 ./margo-p2p-latency -i 100000 -n "verbs://"
# <op> <iterations> <warmup_iterations> <size> <min> <q1> <med> <avg> <q3> <max>
noop    100000  100     0       0.000017643     0.000020266     0.000020742     0.000023233     0.000026464     0.000243187

Not sure when that first started happening, but has been going on since the nightly tests got going again in November

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Reference: sds/margo#54