[Beowulf] Similar to a multi CPU machine?
ajt at rri.sari.ac.uk
Mon Nov 14 06:06:19 PST 2005
Robert G. Brown wrote:
> On Wed, 9 Nov 2005, Jake Thebault-Spieker wrote:
>> Is there a way to make a cluster act like a dual(or triple, quad,
>> etc.) CPU
>> machine? I'vee been looking at purchasing a dual PII machine, but then
>> realized that I have six 166Mhz machines sitting around doing nothing.
>> OpenMosix do this? Is there OpenMosix for 2.6.x? This will be run on
>> if it works.
> Boy did YOU come to the right list.
Jake could also have a look at:
There is a development version of openMosix for the 2.6 kernel, but most
'production' clusters are running 2.4 kernels. The openMosix kernel does
do similar process migration to that done by an SMP kernel, but it does
it using a network interconnect between CPU's on different machines.
> That is what this list is devoted to, as it has been for coming up on a
> decade now (hey Don, when IS the ten year list anniversary?:-)
> OpenMosix is one solution. Scyld is another. bproc (close kin to
> scyld) is
> a third.
One more possibility is OpenSSI:
This differs from openMosix in that entire processes are migrated
between machines. OpenMosix only migrates the active pages of the user
context of processes between machines. It also uses the openMosix
> SGE (or other batch/queue managers) yet another. Even plain
> old linux and some job management scripts are more than adequate for a
> lot of tasks.
True, and these can also be combined with openMosix to make a very
flexible and powerful solution to solving a wide range of problems.
> Finally, if you are looking for "true parallel" operation
> (many CPUs working on a single task vs many CPUs working on many tasks)
> there are a whole lot of alternatives involving the distro of your
> choice with e.g. PVM or MPI or raw socket programming layered on top.
That's right - Although openMosix is good at load-balancing you will
need PVM/MPI to pool the CPU resources of your six PC's. This would be
the same for an SMP kernel too: However some 'embarassingly' parallel
tasks do run very well under openMosix, and openMosix can also assist
the performance of "true parallel" PVM/MPI applications by migrating
PVM/MPI sub-processes to less heavily burdened CPU's. OpenMosix works at
kernel level 'below' the PVM/MPI libraries and transparently migrates
PVM/MPI processes between CPU's on different PC's to balance the load.
> Be careful -- some of these cost money, some of these require a custom
Jake, you can try out openMosix without installing it using the
ClusterKnoppix 'live' CD:
Dr. A.J.Travis, | mailto:ajt at rri.sari.ac.uk
Rowett Research Institute, | http://www.rri.sari.ac.uk/~ajt
Greenburn Road, Bucksburn, | phone:+44 (0)1224 712751
Aberdeen AB21 9SB, Scotland, UK. | fax:+44 (0)1224 716687
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