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SubjectRe: [RFC PATCH 0/2] sched: simplify the select_task_rq_fair()
On 01/21/2013 04:26 PM, Mike Galbraith wrote:
> On Mon, 2013-01-21 at 15:34 +0800, Michael Wang wrote:
>> On 01/21/2013 02:42 PM, Mike Galbraith wrote:
>>> On Mon, 2013-01-21 at 13:07 +0800, Michael Wang wrote:
>>>
>>>> That seems like the default one, could you please show me the numbers in
>>>> your datapoint file?
>>>
>>> Yup, I do not touch the workfile. Datapoints is what you see in the
>>> tabulated result...
>>>
>>> 1
>>> 1
>>> 1
>>> 5
>>> 5
>>> 5
>>> 10
>>> 10
>>> 10
>>> ...
>>>
>>> so it does three consecutive runs at each load level. I quiesce the
>>> box, set governor to performance, echo 250 32000 32 4096
>>>> /proc/sys/kernel/sem, then ./multitask -nl -f, and point it
>>> at ./datapoints.
>>
>> I have changed the "/proc/sys/kernel/sem" to:
>>
>> 2000 2048000 256 1024
>>
>> and run few rounds, seems like I can't reproduce this issue on my 12 cpu
>> X86 server:
>>
>> prev post
>> Tasks jobs/min jobs/min
>> 1 508.39 506.69
>> 5 2792.63 2792.63
>> 10 5454.55 5449.64
>> 20 10262.49 10271.19
>> 40 18089.55 18184.55
>> 80 28995.22 28960.57
>> 160 41365.19 41613.73
>> 320 53099.67 52767.35
>> 640 61308.88 61483.83
>> 1280 66707.95 66484.96
>> 2560 69736.58 69350.02
>>
>> Almost nothing changed...I would like to find another machine and do the
>> test again later.
>
> Hm. Those numbers look odd. Ok, I've got 8 more cores, but your hefty
> load throughput is low. When I look low end numbers, seems your cores
> are more macho than my 2.27 GHz EX cores, so it should have been a lot
> closer. Oh wait, you said "12 cpu".. so 1 6 core package + HT? This
> box is 2 NUMA nodes (was 4), 2 (was 4) 10 core packages + HT.

It's a 12 core package, and only 1 physical cpu:

Intel(R) Xeon(R) CPU X5690 @ 3.47GHz

So does that means the issue was related to the case when there are
multiple nodes?

Regards,
Michael Wang

>
> -Mike
>
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