Re: unfair scheduling with tbb application observed, could it be akernel issue?

From: Pedro Larroy
Date: Mon Aug 06 2012 - 10:28:49 EST


I didn't enable cgroups explicitly, and don't have userspace tools for
that installed.

Thanks.

Pedro.

On Mon, Aug 6, 2012 at 4:25 PM, Mike Galbraith <efault@xxxxxx> wrote:
> On Mon, 2012-08-06 at 16:04 +0200, Pedro Larroy wrote:
>> Hi
>>
>> I think we are observing unfair scheduling of processes that use intel
>> TBB thread scheduler, as we have several processes with nice of 19 and
>> ioniced idle, and somehow the process with nice 0 should be getting
>> more than 1000% cpu
> ..
>> Tasks: 559 total, 37 running, 522 sleeping, 0 stopped, 0 zombie
>> Cpu(s): 67.8%us, 16.0%sy, 13.0%ni, 1.7%id, 0.6%wa, 0.0%hi, 1.0%si, 0.0%st
>> Mem: 98998032k total, 97444688k used, 1553344k free, 53772k buffers
>> Swap: 4198316k total, 704860k used, 3493456k free, 73270776k cached
>>
>> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
>> 14373 disco 39 19 8734m 6.9g 12m R 107 7.3 36:09.72 mmcc
>> 15293 disco 39 19 3174m 1.4g 12m R 101 1.5 19:33.79 mmcc
>> 20341 disco 39 19 2735m 1.1g 12m R 101 1.1 8:40.38 mmcc
>> 18241 disco 39 19 3040m 1.3g 11m R 100 1.4 14:27.91 mmcc
>> 15204 disco 39 19 5418m 3.7g 12m R 99 3.9 20:53.89 mmcc
>> 24901 larroy 20 0 327m 296m 4276 R 88 0.3 0:04.14 cc1plus
>> 24942 larroy 20 0 193m 159m 4008 R 87 0.2 0:01.47 cc1plus
>> 24862 larroy 20 0 417m 388m 7992 R 84 0.4 0:07.02 cc1plus
>> 24959 larroy 20 0 184m 153m 4008 R 80 0.2 0:01.32 cc1plus
>> 24935 larroy 20 0 254m 222m 4024 R 77 0.2 0:02.44 cc1plus
>> 24919 larroy 20 0 336m 301m 4036 R 76 0.3 0:03.61 cc1plus
>> 24972 larroy 20 0 43160 15m 2332 R 76 0.0 0:00.95 cc1plus
>> 24918 larroy 20 0 287m 255m 4024 R 70 0.3 0:02.99 cc1plus
>> 24962 larroy 20 0 44872 17m 2332 R 69 0.0 0:01.23 cc1plus
>> 24976 larroy 20 0 41212 14m 2332 R 66 0.0 0:00.67 cc1plus
>> 24501 larroy 20 0 687m 657m 8044 R 64 0.7 0:22.97 cc1plus
>> 24933 larroy 20 0 211m 177m 4008 R 62 0.2 0:01.79 cc1plus
>> 24899 larroy 20 0 327m 296m 4276 R 57 0.3 0:04.25 cc1plus
>
> Are tasks running in per user cgroups or such? If so, you'd need to
> adjust group shares.
>
> -Mike
>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/