* Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> wrote:
I was toying with a scalable rw_mutex and found that it gives ~10% reduction in system time on ebizzy runs (without the MADV_FREE patch).
2-way x86_64 pentium D box:
2.6.21
/usr/bin/time ./ebizzy -m -P
59.49user 137.74system 1:49.22elapsed 180%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+33555877minor)pagefaults 0swaps
2.6.21-rw_mutex
/usr/bin/time ./ebizzy -m -P
57.85user 124.30system 1:42.99elapsed 176%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+33555877minor)pagefaults 0swaps
nice! This 6% runtime reduction on a 2-way box will i suspect get exponentially better on systems with more CPUs/cores.