Messages in this thread | | | From | "Chen, Dennis (SRDC SW)" <> | Subject | RE: A quick view of the performance benchmark for semaphore-like and mutex | Date | Tue, 17 Apr 2012 11:52:26 +0000 |
| |
On Tue, Apr 17, 2012 at 6:12 PM, Peter Zijlstra <peterz@infradead.org> wrote: > On Tue, 2012-04-17 at 09:36 +0000, Chen, Dennis (SRDC SW) wrote: >> >> Interesting!! Semaphore-like is almost 8s slower than mutex... Also, the Events sycles of perf >> reported is different > > I suspect that if you were to use actual semaphores it would be even > worse, the semaphore implementation doesn't do lock-stealing nor does it > have fancy assembly fast paths. > > In fact, I don't know why you even bother with sems, they're a > deprecated serialization primitive that really shouldn't be used > anymore.
Yes, I am also apt to believe that...Actually I never been bothered by sems in my real life, just for fun! I enjoy the data :-)
| |