On 04/18/2013 07:13 PM, zhang.yi20@xxxxxxxxxx wrote: > Darren Hart <dvhart@xxxxxxxxxxxxxxx> wrote on 2013/04/18 22:34:29: > >> On 04/18/2013 01:05 AM, zhang.yi20@xxxxxxxxxx wrote: >>> >>> I have run futextest/performance/futex_wait for testing, >>> 5 times before make it long: >>> futex_wait: Measure FUTEX_WAIT operations per second >>> Arguments: iterations=100000000 threads=256 >>> Result: 10215 Kiter/s >>> >>> futex_wait: Measure FUTEX_WAIT operations per second >>> Arguments: iterations=100000000 threads=256 >>> Result: 9862 Kiter/s >>> >>> futex_wait: Measure FUTEX_WAIT operations per second >>> Arguments: iterations=100000000 threads=256 >>> Result: 10081 Kiter/s >>> >>> futex_wait: Measure FUTEX_WAIT operations per second >>> Arguments: iterations=100000000 threads=256 >>> Result: 10060 Kiter/s >>> >>> futex_wait: Measure FUTEX_WAIT operations per second >>> Arguments: iterations=100000000 threads=256 >>> Result: 10081 Kiter/s >>> >>> >>> And 5 times after make it long: >>> futex_wait: Measure FUTEX_WAIT operations per second >>> Arguments: iterations=100000000 threads=256 >>> Result: 9940 Kiter/s >>> >>> futex_wait: Measure FUTEX_WAIT operations per second >>> Arguments: iterations=100000000 threads=256 >>> Result: 10204 Kiter/s >>> >>> futex_wait: Measure FUTEX_WAIT operations per second >>> Arguments: iterations=100000000 threads=256 >>> Result: 9901 Kiter/s >>> >>> futex_wait: Measure FUTEX_WAIT operations per second >>> Arguments: iterations=100000000 threads=256 >>> Result: 10152 Kiter/s >>> >>> futex_wait: Measure FUTEX_WAIT operations per second >>> Arguments: iterations=100000000 threads=256 >>> Result: 10060 Kiter/s >>> >>> >>> Seems OK, is it? >>> >> >> Changes appear to be in the noise, no impact with this load >> anyway. >> How many CPUs on your test machine? I presume not 256? >> >> -- > > There are 16 CPUs， and mode is: > Intel(R) Xeon(R) CPU C5528 @ 2.13GHz > > Shall I make the number of threads as the CPUS? I test again with argument > '-n 16', the result is similar. No, I just wanted to be sure you weren't running 256 threads on 1 CPU as you wouldn't be likely to be stressing the bucket list much :-) > BTW, have you seen the testcase in my other mail? It seems to be rejected > by LKML. Might have something to do with what appears to still be HTML email. You really need to fix your email client. See: http://www.tux.org/lkml/ #12 in particular. -- Darren Hart Intel Open Source Technology Center Yocto Project - Technical Lead - Linux Kernel -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>