iperf-3.15-mt-beta1

[swlars]

iperf-3.15-mt-beta1 2023-09-29

Accumulated release notes from iperf-3.14 and earlier multithreaded
beta releases:

• Notable user-visible changes

  • Multiple test streams started with -P/--parallel will now be
    serviced by different threads. This allows iperf3 to take
    advantage of multiple CPU cores on modern processors.

  • Remove some busy-waiting left over from the original
    single-threaded implementation, which caused the multi-threaded
    iperf3 to consume CPU resources for no particular reason, and
    possible subsequent packet loss.

  • CentOS 7's default compiler is a version of GCC that is too old to
    compile code using C11 atomic variables. A workaround has been
    devised for 64-bit CentOS 7 systems, it is not clear whether this
    approach will work on 32-bit CentOS 7 hosts, or other
    similarly-vintage build environment.

  • Fix a bug related to idle timeouts, so that the --rcv-timeout
    option works correctly.

  • Make shutdown of threads more tolerant in the face of various
    orders of operations at the end of tests.

• Developer-visible changes

  • iperf3 requires pthreads and C atomic variables to compile and run.

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This discussion was created from the release iperf-3.15-mt-beta1.