esnet/iperf 3.16-beta1 on GitHub

iperf-3.16-beta1 2023-11-15

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, and will
  generally result in significant throughput increases (PR #1591).
- OpenSSL 3 is now detected at build time. If OpenSSL 3 is found,
  various older, deprecated, APIs will not be used. iperf3 will
  continue to work with OpenSSL 1.1.1. OpenSSL is used for as a part
  of the iperf3 authentication functionality (Issue #1300, PR
  #1589).
- The authorized users file used by the authentication functionality
  is now checked for accessibility much earlier during the program
  startup, as opposed to being checked near the start of a
  test (Issue #1583, PR #1585).
Developer-visible changes
- BREAKING CHANGE: iperf3 now requires pthreads and C atomic
  variables to compile and run.