profiling with Nsight Sys shows lots of "IB send waits?" #2745
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BenWibking
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Hi,
I've been profiling my AMReX code with Nsight Systems, with --nic-metrics=true. It's a neat feature, but sometimes there are things going on in the network that don't seem to match up with anything else in the timeline. For instance, at the end of a timestep, there are sometimes a large number of "IB send waits" that appear.
What is a "send wait" and what does it mean that I see spikes of ~1e7 of them in the profile view?
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