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Tested with libgomp testsuite and looked at performance numbers of Sho's omp_fib.c and libgomp.c/sort-1.c, unfortunately the differences looked to be in the noise. But, e.g. on omp_fib.c strace -f shows that the number of futex FUTEX_WAKE syscalls went down a lot (from ~ 75000 for omp_fib 32 down to ~ 50 with the default wait policy, of course for OMP_WAIT_POLICY=passive it remained roughly the same).
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