[Symphony] Symphony + PVM - multiple slave nodes possible?

[Tim Graham]

Hi Ted,

I am running this on Amazon EC2.  I have 3 machines: 1 master and two
slaves.  I add the slaves by running:

pvm> add <hostname>

After that is finished I get the following configuration:

pvm> conf
conf
3 hosts, 1 data format
                    HOST     DTID     ARCH   SPEED       DSIG
  domU-12-31-39-00-E1-73    40000    LINUX    1000 0x00408841
ec2-67-202-7-241.compute-1.amazonaws.com   100000    LINUX    1000 0x00408841
ec2-174-129-120-69.compute-1.amazonaws.com   140000    LINUX    1000 0x00408841

I then invoke

./symphony_m_tm_cp -F ~/model.mod -D ~/data.dat

and eventually get the following output:

[t100002] BEGIN
done: 2 left: 1 ub: ?? lb: 160590.93 time: 6
done: 3 left: 2 ub: ?? lb: 160590.93 time: 11
[...]

Using top, I see ~35% CPU usage on the first pvm host and 0% on the second.

If I reverse the order of the hosts by deleting the first and
re-adding it, I get the reverse result in terms of CPU usage so both
hosts are definitely setup properly.

I haven't tried any of the the test applications.

Thanks for your help,
Tim


On Mon, Apr 27, 2009 at 10:17 PM, Ted Ralphs <ted at lehigh.edu> wrote:
> Hi Tim,
>
> There shouldn't be anything special required to get this to work. Can
> you provide a few more details of what you're doing? How are you
> adding the additional hosts in PVM? What is the exact command line you
> are using to launch SYMPHONY? Are you able to run any of the test
> applications with multiple slave nodes? If you can provide a little
> more detail, we should be able to get it working.
>
> Cheers,
>
> Ted
>
> On Thu, Apr 23, 2009 at 1:59 AM, Tim Graham <tsg7 at cornell.edu> wrote:
>> Hi,
>>
>> I've compiled Symphony in the default distributed-memory configuration
>> (with m_tm_cp and lp_cg executables).  This works on two nodes, but
>> when a a second PVM host is added, only the first host is used.  Is it
>> possible to run multiple slaves nodes?  I would expect that node
>> processing could be done in parallel, but perhaps some other
>> configuration option is needed?
>>
>> Thanks,
>> Tim
>>
>> _______________________________________________
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>> Symphony at list.coin-or.org
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>>
>
>
>
> --
> Dr. Ted Ralphs
> Associate Professor, Lehigh University (permanent)
> Visiting Professor, Monash University (current)
> (610) 628-1280
> ted 'at' lehigh 'dot' edu
> coral.ie.lehigh.edu/~ted
>
> Sent from Caulfield East, Victoria, Australia
>