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Hermes SMTP Server) with ESMTPA ID 3698fc0ad65fa3c7ae7f6970933a9585; Wed, 22 Mar 2023 17:09:32 +0000 (UTC) Content-Type: text/plain; charset=us-ascii List-Id: Technical discussions relating to FreeBSD List-Archive: https://lists.freebsd.org/archives/freebsd-hackers List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-hackers@freebsd.org Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3731.400.51.1.1\)) Subject: Re: Periodic rant about SCHED_ULE From: Mark Millard In-Reply-To: Date: Wed, 22 Mar 2023 10:09:20 -0700 Cc: George Mitchell , FreeBSD Hackers Content-Transfer-Encoding: quoted-printable Message-Id: <79DA50DD-1B3B-490A-B639-37612203D23E@yahoo.com> References: <44FB7EE7-295F-46B1-9128-945DCAC6E79E.ref@yahoo.com> <44FB7EE7-295F-46B1-9128-945DCAC6E79E@yahoo.com> To: Steve Kargl X-Mailer: Apple Mail (2.3731.400.51.1.1) X-Rspamd-Queue-Id: 4PhZhc3MD1z3mW4 X-Spamd-Bar: ---- X-Spamd-Result: default: False [-4.00 / 15.00]; REPLY(-4.00)[]; ASN(0.00)[asn:36647, ipnet:98.137.64.0/20, country:US]; TAGGED_RCPT(0.00)[freebsd] X-Rspamd-Pre-Result: action=no action; module=replies; Message is reply to one we originated X-ThisMailContainsUnwantedMimeParts: N On Mar 22, 2023, at 09:48, Steve Kargl = wrote: > On Wed, Mar 22, 2023 at 09:20:27AM -0700, Mark Millard wrote: >>=20 >> Giving folks a way to know they are repeating your tests >> appropriately, could give interested folks a way to answer >> their own questions. >=20 > 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.,=20 >=20 > = https://lists.freebsd.org/pipermail/freebsd-hackers/2008-October/026375.ht= ml This referenced using: % time /OpenMPI/mpiexec -machinefile mf -n 8 ./Test_mpi |& tee sgk.log > It appears to be (or was) an issue with cpu affinity. >=20 > Caveat: I haven't tested this in a long time. I simple use 4BSD. >=20 Looks like a csh context, so . . . # csh # time /OpenMPI/mpiexec -machinefile mf -n 8 ./Test_mpi |& tee sgk.log /OpenMPI/mpiexec: Command not found. That still leaves me trying to figure out an accurate way to reproduce all the steps to have a comparable way to see for myself. =3D=3D=3D Mark Millard marklmi at yahoo.com