From: riel@redhat.com
To: linux-kernel@vger.kernel.org
Cc: peterz@infradead.org, mgorman@suse.de, mingo@kernel.org,
jhladky@redhat.com, lvenanci@redhat.com
Subject: [PATCH 0/2] numa,sched: improve performance for multi-threaded workloads
Date: Mon, 31 Jul 2017 15:28:45 -0400 [thread overview]
Message-ID: <20170731192847.23050-1-riel@redhat.com> (raw)
The NUMA balancing code spends way too much CPU time scanning and
faulting when running multi-threaded workloads.
This patch set slows down NUMA PTE scanning when there are lots
of shared faults, and when dealing with large NUMA groups that
have a large fraction of shared faults.
Some results from Jirka's half-week performance run, on
a 4 node system:
- improvements in the range of 10-30% for NAS benchmarks
(mostly ft and lu subtests)
- SPECjbb2005 single instance mode - improvements in the range of 5-10%
- SPECjvm2008 - performance very similar to before, some small
improvements for the scimark* subtests
next reply other threads:[~2017-07-31 19:35 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-31 19:28 riel [this message]
2017-07-31 19:28 ` [RHEL-ALT-7.4 PATCH 1/2] numa,sched: slow down scan rate if shared faults dominate riel
2017-08-02 7:01 ` Mel Gorman
2017-08-10 12:07 ` [tip:sched/core] sched/numa: Slow " tip-bot for Rik van Riel
2017-07-31 19:28 ` [RHEL-ALT-7.4 PATCH 2/2] sched,numa: scale scan period with tasks in group and shared/private riel
2017-08-02 10:22 ` Mel Gorman
2017-08-10 12:07 ` [tip:sched/core] sched/numa: Scale " tip-bot for Rik van Riel
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