From: Pavel Machek <pavel@ucw.cz>
To: Thomas Gleixner <tglx@linutronix.de>,
kernel list <linux-kernel@vger.kernel.org>
Cc: mingo@redhat.com, hpa@zytor.com, x86@kernel.org, peterz@infradead.org
Subject: niced tasks on SMT system
Date: Thu, 28 Dec 2017 13:10:25 +0100 [thread overview]
Message-ID: <20171228121024.GA18152@amd> (raw)
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Hi!
Ok, so I'm compiling, and I'd like to run a flight simulator.
Flightgear normally does 20fps on my system... kinda low but playable.
I have reniced make -j 5 fo kernel running. Scheduler gives 100% of
one of CPUs to Flightgear (good), but the smt sibling is used by the
compilation, and I'm down to 9 fps. Not good.
Even with single-threaded make, I have 10-13fps.
Is there way to learn which CPUs are SMT siblings?
Is there way to disable SMT during runtime?
Can I do something to improve Flightgear performance and still do
compilation?
Thanks,
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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next reply other threads:[~2017-12-28 12:10 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-28 12:10 Pavel Machek [this message]
2017-12-28 13:23 ` niced tasks on SMT system Mike Galbraith
2017-12-28 18:53 ` Pavel Machek
2017-12-28 18:58 ` Ozgur
2017-12-28 20:59 ` Pavel Machek
2017-12-28 21:07 ` Ozgur
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