Re: [PATCH] improve rwsem scalability (was Re: [CFT][RFC] HT scheduler)

Nick Piggin
2003-12-14T01:06:24Z

Nick Piggin wrote:

>
>
> Ingo Molnar wrote:
>
>> On Fri, 12 Dec 2003, Nick Piggin wrote:
>>
>>
>>> getting contended. The following graph is a best of 3 runs average.
>>> http://www.kerneltrap.org/~npiggin/rwsem.png
>>>
>>
>> the graphs are too noise to be conclusive.
>>
>>
>>> The part to look at is the tail. I need to do some more testing to see
>>> if its significant.
>>>
>>
>> yes, could you go from 150 to 300?
>>
>
> The benchmark dies at 160 rooms unfortunately. Probably something in
> the JVM.
>
> I'll do a larger number of runs around the 130-150 mark.
>

OK, this is an average of 5 runs at 145, 150, 155 rooms with my scheduler
patches, with and without my rwsem patch. Its all over the place, but I
think
rwsem does give a small but significant improvement.