Re: [PATCH v2 0/4] ipc: reduce ipc lock contention
From: Rik van Riel
Date: Tue Mar 05 2013 - 12:10:37 EST
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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