Messages in this thread | | | From | "Ivan R. Judson" <> | Subject | RE: AIX disclaim() or Tru64 madvise (MADV_DONTNEED) needed | Date | Fri, 20 Aug 1999 14:50:48 -0500 |
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I believe this is also what is preventing MPICH developers from having a shared memory implementation of MPI on linux, they have been quietly wishing (I don't know if they've asked out loud or not) for this for a year or more...
--Ivan
> -----Original Message----- > From: owner-linux-kernel@vger.rutgers.edu > [mailto:owner-linux-kernel@vger.rutgers.edu]On Behalf Of Jan Vroonhof > Sent: Friday, August 20, 1999 2:33 PM > To: Christoph Rohland > Cc: x-linux-kernel@vger.rutgers.edu > Subject: Re: AIX disclaim() or Tru64 madvise (MADV_DONTNEED) needed > > > Christoph Rohland <hans-christoph.rohland@sap-ag.de> writes: > > > You can not use file descriptors for shared memory since they sync to > > file on unmap. This would be possible if we had shm_open which > > implements shared memory with the normal fd/mmap/unmap syntax. > > Are you implying that it would suffice if you could use MAP_SHARED of > /dev/zero and/or MAP_SHARED|MAP_ANONYMOUS style shared memory? > > If so, there is (or was) a patch for doing this for Linux (look for > shmfs). It seems to me like a nice feature for 2.3 > > See > > http://www.uwsg.indiana.edu/hypermail/linux/kernel/9806.2/0803.html > > (It was even designed explicitly for shm_open) > > Unfortunately the website seems to have disappeared :-( > > Jan > > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.rutgers.edu > Please read the FAQ at http://www.tux.org/lkml/ >
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