Hey Bob-- As we're doing some testing of the multi-threaded iperf3 in various environments, we've observed (not surprisingly) that CPU pinning of threads can have a significant impact on the throughput of tests. Generally we're running on some recent Ubuntu distribution of Linux.
I'm trying to understand a report that iperf2 seems to automatically Do The Right Thing (tm) with respect to getting threads on the right CPU cores (particularly on multiple CPU package systems). But by contrast, good performance with iperf3 needs either the -A option for CPU affinity or running iperf3 within an invocation of numactl. I haven't yet had the opportunity to experiment with iperf2 much in this kind of environment. Is there some magic that iperf2 does to automatically figure out a good placement for the threads it spawns? I've looked through the source code (in particular compat/Thread.c) but I can't find anything applicable. I'd love to do something similar, if indeed this exists, in iperf3. Thanks! Bruce.
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