[Coin-symphony] PVM additionnal question

[alexleb]

When I use the P parameter the branch and cut finishes immediately
Here is the config
Pvm conf shows 4 nodes for example with DTID
40000, 80000, c0000, 100000
Pvm ps reports no jobs running
Quit

I run from command line
/home/user/vrp_m_tm_cp -F /home/user/sample.vrp -N 5
And I get the communications always from the task tc0001 and the optimal
solution is found - as expected

BUT If I run the same command but with the -P param to tell it to run P LP
in PVM instead of one (I suppose it is to doing with 1 when no P is used), I
get only one communication from t1000001:

/home/user/vrp_m_tm_cp -P 4 -F /home/user/sample.vrp -N 5
...
[t1000001] BEGIN
(and then immediately)
***
* Branch and Cut Finished *
* Now displaying stats ...*
..
No Solution Found

Any idea of what I'm doing wrong?

Thanks so far for your great help.


Alexandre Le Bouthillier
Alexleb at crt.umontreal.ca
Centre de Recherche sur les Transports
C.P. 6128, succ. centre-ville
(UdeM, 2920 Chemin des services #3517)
Montreal (Qc) Canada, H3C 3J7

-----Original Message-----
From: Ted Ralphs [mailto:tkralphs at lehigh.edu] 
Sent: Wednesday, July 13, 2005 7:16 AM
To: alexleb
Cc: Symphony mailing list post
Subject: Re: [Coin-symphony] PVM additionnal question

alexleb wrote:
> When I run the vrp_m_tm_cp application, do I have to spawn anything from
pvm
> or it's a standalone application that will spawn for all nodes present in
> the conf of pvm ?

You don't have to spawn anything, but it will not automatically use all 
the nodes in the configuration. You need to specify the number of LP 
processes you want to spawn on the command line with "-P" as follows:

vrp_m_tm_cp -P 12 -F sample.vrp

The number of LP processes does not have to be equal to the number of 
processors available. It can be less or even more, although I wouldn't 
suggest more. Hope this helps.

Cheers,

Ted
-- 
Dr. Ted Ralphs
Assistant Professor
Industrial and Systems Engineering
Lehigh University
(610)758-4784
tkralphs at lehigh.edu
www.lehigh.edu/~tkr2

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