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SubjectRe: distributed shared memory / mmap
On Wed, Aug 20, 2008 at 03:43:24PM +0100, Steven Whitehouse wrote:
> Hi,
>
> On Wed, 2008-08-20 at 15:18 +0200, Martin Uecker wrote:
> >
> > Hi!
> >
> > Is there any easy way to get shared memory between to
> > processes on different machines? It seems possible using mmap
> > on a file system like GFS on top of a distributed block device.
> >
> >
> > Sincerly,
> > Martin Uecker
> >
> Yes, you can do it using GFS/GFS2 and it should work. On the other hand,
> don't do it. Its probably not what you want and unlikely to give you
> good performance since the locking is "per inode" and thus you'll
> generate a lot of cache flushing if there is any appreciable amount of
> writing to the shared region. If you have a read mostly (or only)
> workload, then it will work much better.

Alternatively, you can use kernel-level DSM like provided by Kerrighed.
Kerrighed provides cluster-wide SYSV shm segments, which sharing is handled
at the page level -> far better than the inode level.

You may find this solution not-so-easy though...

Regards,

Louis

--
Dr Louis Rilling Kerlabs
Skype: louis.rilling Batiment Germanium
Phone: (+33|0) 6 80 89 08 23 80 avenue des Buttes de Coesmes
http://www.kerlabs.com/ 35700 Rennes
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