Re: [PATCH v2 0/4] ipc: reduce ipc lock contention

[Rik van Riel]

On 03/05/2013 04:35 AM, Davidlohr Bueso wrote:

> 2) While on an Oracle swingbench DSS (data mining) workload the
> improvements are not as exciting as with Rik's benchmark, we can see
> some positive numbers. For an 8 socket machine the following are the
> percentages of %sys time incurred in the ipc lock:
>
> Baseline (3.9-rc1):
> 100 swingbench users: 8,74%
> 400 swingbench users: 21,86%
> 800 swingbench users: 84,35%
>
> With this patchset:
> 100 swingbench users: 8,11%
> 400 swingbench users: 19,93%
> 800 swingbench users: 77,69%

Does the swingbench DSS workload use multiple semaphores, or
just one?

Your patches look like a great start to make the semaphores
more scalable. If the swingbench DSS workload uses multiple
semaphores, I have ideas for follow-up patches to make things
scale better.

What does ipcs output look like while running swingbench DSS?

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