Messages in this thread | | | Date | Wed, 20 Aug 2008 17:04:08 +0200 | From | Louis Rilling <> | Subject | Re: 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 [unhandled content-type:application/pgp-signature] | |