Date: Wed, 22 Mar 2023 09:48:17 -0700 From: Steve Kargl <sgk@troutmask.apl.washington.edu> To: Mark Millard <marklmi@yahoo.com> Cc: George Mitchell <george+freebsd@m5p.com>, FreeBSD Hackers <freebsd-hackers@freebsd.org> Subject: Re: Periodic rant about SCHED_ULE Message-ID: <ZBsxUYQwqHvuIdpe@troutmask.apl.washington.edu> In-Reply-To: <44FB7EE7-295F-46B1-9128-945DCAC6E79E@yahoo.com> References: <44FB7EE7-295F-46B1-9128-945DCAC6E79E.ref@yahoo.com> <44FB7EE7-295F-46B1-9128-945DCAC6E79E@yahoo.com>
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On Wed, Mar 22, 2023 at 09:20:27AM -0700, Mark Millard wrote: > > Giving folks a way to know they are repeating your tests > appropriately, could give interested folks a way to answer > their own questions. This has been an issue for years (and now stretching into decades). It is trivial to show the problem with any numerically intensive MPI program. I've done this a few times, and reported the issues. Search the mailing list archives, e.g., https://lists.freebsd.org/pipermail/freebsd-hackers/2008-October/026375.html It appears to be (or was) an issue with cpu affinity. Caveat: I haven't tested this in a long time. I simple use 4BSD. -- Steve
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