[Beowulf] Programming for heartbeat

[John Hearns]

I echo what mark and Peter have said.

" none of them (at least from what I've seen) is what I want"
What would you like to achieve?  Maybe you would like the cluster to behave
in what several years agoo the Mosix project was able to do - process
migration between nodes in a cluster?


On 7 May 2013 03:56, Peter St. John <peter.st.john at gmail.com> wrote:

> I'm pretty sure (but correct me if I'm wrong) that Oracle's "message
> passing toolkit" would be built on OpenMPI and not the other way around;
> OpenMPI is open source, see
> http://en.wikipedia.org/wiki/OpenMPI
> and does not require a software license from Sun or Oracle.
>
> you can download (free) OpenMPI from this project page:
> http://www.open-mpi.org/software/ompi/v1.6/
>
> Oracle is indeed one of the industry partners, as is IBM, but also
> government labs like Los Alamos and various Universities.
>
> MPI provides a library so that your programs can pass jobs to other cores;
> something like
> for i = 1 to 10
>   returnarray[i] = CallApplicationAtAnotherNode(i)
> next i
>
> along those lines. You want to try it if you want to do something
> parallelizable, e.g. send each possible move in the current chess position
> to each of many cores, each one simultaneously evaluates the outcome and
> returns a result; play the best result. But if you want to add a column of
> a million numbers, sending 1000 numbers to each of 1000 processors may take
> more time than one processor just adding them up, so that wouldn't be so
> parallelizable.
>
> Peter
>
>
> On Mon, May 6, 2013 at 10:18 PM, Mark Hahn <hahn at mcmaster.ca> wrote:
>
>> > I'm completely new to all this beowulf thing. I've just now connected my
>> > 2 PCs using Heartbeat + Pacemaker,
>>
>> heartbeat/pacemaner are for high-availability cluster,
>> whereas beowulf clustering is primarily about high-performance
>> or -throughput clustering.  a beowulf cluster may use HA
>> techniques, but normally only for support nodes (if at all.)
>> (for symmetry, HA clusters do not normally use MPI, and
>> rarely provide batch job schedulers, which is normal for HPC clusters).
>>
>> > I've seen OpenMPI, but it uses Oracle's Message Passing Toolkit. Would
>> > you guys know how could I get a program to work in this beowulf?
>>
>> MPI is a library which permits you to run a program on several
>> machines, and have them communicate and synchronize fairly readily.
>> this has nothing to do with HA...
>>
>> does that help?
>>
>> regards, mark hahn.
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