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From: L A Walsh <>
Subject: Re: More oddities with multiple processor groups
Date: Fri, 13 Apr 2018 14:12:00 -0000	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <87in8xwre7.fsf@Rainer.invalid>

Achim Gratz wrote:
> The problem here is that on Linux you don't need to do anything extra to
> use any of the advertised logical processors from a single application,
> while on Windows you need to first create a thread and set it's affinity
> to a different group than where your process was started in, then assign
> each new thread an affinity to one of the available groups.  If you
> don't do that, all threads will be restricted to the original group.
	Not exactly true.  They are not *restricted* -- it's a *feature*
of the Windows scheduler, in that future procs/threads inherit the
cpu of the parent.  Linux's scheduler is more advanced as well as
being replaceable.  MS doesn't want you to do that

> there might
> need to be some option to restrict Cygwin to a single processor group
> for some applications to work (correctly).
	There is.  Start them all on a single cpu & set the cpu 
mask.  Pretty much the same way you restrict procs on linux --
you can run them with a specific cpu mask, and most programs will
keep running w/that mask.

	Unfortunately, AFAIK, I don't think POSIX specifies
a way to set affinities, so I'm not sure how cygwin would do it.

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  reply	other threads:[~2018-04-13 14:12 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-11 18:05 Achim Gratz
2018-04-13 14:12 ` L A Walsh [this message]
2018-04-13 18:29   ` Brian Inglis
2018-04-13 19:17     ` Corinna Vinschen
2018-04-13 17:22 ` Brian Inglis
2018-04-13 19:55   ` Achim Gratz

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