[Bug 195098] pthread lock performance degradation on single CPU VM

bugzilla-noreply at freebsd.org bugzilla-noreply at freebsd.org
Thu Dec 4 16:34:25 UTC 2014


Ed Maste <emaste at freebsd.org> changed:

           What    |Removed                     |Added
            Summary|pthread lock performance    |pthread lock performance
                   |degradation                 |degradation on single CPU
                   |                            |VM

--- Comment #2 from Ed Maste <emaste at freebsd.org> ---
Aha, I can reproduce this on a single-vCPU bhyve VM:

$ time ./test-once >/dev/null
        9.42 real         2.57 user         6.84 sys
$ time ./test-once >/dev/null
     4061.43 real       801.23 user      3256.45 sys

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