Date: Mon, 26 May 2003 22:43:24 -0400 From: Anthony Schneider <anthony@x-anthony.com> To: Tim Robbins <tjr@FreeBSD.ORG> Cc: freebsd-current@FreeBSD.ORG Subject: Re: mpi + shmem issues Message-ID: <20030527024324.GA21481@x-anthony.com> In-Reply-To: <20030526123953.A91078@dilbert.robbins.dropbear.id.au> References: <20030525064929.GA96588@x-anthony.com> <20030525211730.GA5226@x-anthony.com> <20030526123953.A91078@dilbert.robbins.dropbear.id.au>
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--Dxnq1zWXvFF0Q93v Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable i see. thanks! -Anthony. On Mon, May 26, 2003 at 12:39:53PM +1000, Tim Robbins wrote: > On Sun, May 25, 2003 at 05:17:30PM -0400, Anthony Schneider wrote: >=20 > > so, does this mean that mpich somehow exhausted all shmem locks? > > after running the program only 10 times, i see this as infeasible, > > considering > > a) mpich (presumably in MPI_Init()) would only want 1 or > > 2 locks on init > > and > > b) any shared memory locks mpich grabs should be freed > > upon process completion (whether clean or not) by the > > operating system, no? >=20 > No, semaphores stay around until they are removed. Perhaps there's an MPI= _Xyz > function you should be calling before your program exits. In any case, yo= u can > use "ipcs -s" to list semaphores, and "ipcrm -s semid" to remove semaphor= es. >=20 > It looks like the program is leaking semaphores -- notice how your program > fails when you run it for the 11th time, and the default maximum number of > semaphores in the GENERIC kernel is 10 (sysctl kern.ipc.semmni). >=20 >=20 > Tim --Dxnq1zWXvFF0Q93v Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.7 (FreeBSD) iD8DBQE+0tDLKUeW47UGY2kRAvI2AJ9i3UvabJcf0MYVGhrqUxcnrWTB+wCfWRw0 1VUMbSUO+w8SPPEouyocSWY= =oOik -----END PGP SIGNATURE----- --Dxnq1zWXvFF0Q93v--
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