Messages in this thread | | | From | Con Kolivas <> | Subject | Re: Inconsistent timing results of multithreaded program on an SMP machine. | Date | Thu, 24 Nov 2005 20:40:59 +1100 |
| |
On Thu, 24 Nov 2005 19:33, Marcel Zalmanovici wrote: > Hi Con, > > I've tried the pthread_join theory. > pthread_join completes very fast, no evidence on it being the perpetrator > here. > > I've ran your ps -... idea in a different term window every ms while the > test was running. It created a large file so I won't mail it to you, but > both me and Muli observed that once the thread ends it quickly disappears > from the ps list. > > I've also ran Muli's idea and added gettimeofday calls. > Here's the altered code and output: > > (See attached file: idle.log)(See attached file: sched_test.c) > > As you can see, if a thread already finished pthread_join returns in a > split second. > > Any other ideas are welcome :-)
Profile the actual application?
> P.S. - I agree that Lotus isn't ideal for this kind of conversations, but > that's what IBM is using.
It was tongue in cheek ;) Well that should still not stop you from replying below the original thread.
Cheers, Con - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |