[SCore-users] Score limitations?

[Amik St-Cyr CFD Lab]

Hi again,


LOOP BACK TEST:
---------------

It seems that it works on ly if I try something
like:

 ./rpminit cn1 myrinet2k

and then

./rpmtest cn1 myrinet2k -dest $node -ping

where node goes from 1 to 128


If INSTEAD I use:

./rpminit cn2 myrinet2k

./rpmtest cn2 myrinet2k -dest $node -ping

then time communication times out for each node.

Is this behaviour normal?

Other tests:
------------

For the other test everithing goes fine below 64 nodes 
and crashes if I try to use more. COuld this strange behavior 
arise when the routing tables/files for the myrinet2k switch 
are wrong ?



Amik St-Cyr

On Tue, 2002-09-17 at 20:53, kameyama at pccluster.org wrote:
> In article <1032301235.1944.81.camel at stan.cfdlab.mcgill.ca> Amik St-Cyr CFD Lab <amik at cfdlab.mcgill.ca> wrotes:
> > (not yet fully functional) Beowulf.
> > We have a 128 nodes(dual) cluster connected with both a myrinet2k 
> > switch and an ethernet 100MB network.
> > 	The only problem (yet) is that when I try a very simple 
> > program the scrun/mpirun hangs forever when the number of
> > nodes used is greater then 64.
> ...
> > Do you folks think that:
> > 
> > 1)the problem is myrinet2k related ?
> 
> Please check Total test by scstest.
> Please look at
>     http://www.pccluster.org/score/dist/score/html/en/installation/pm-testmyrinet.html
> 
> > 2)the driver for the myrinet switch has a problem ?
> >    we are using:
> > 	/* PM/Myrinet */
> > 	myrinet2k   type=myrinet2k \
> > 		    -firmware:file=/opt/score/share/lanai/lanaiM2k.mcp \
> > 		    -config:file=/opt/score/etc/pm-myrinet.conf
> 
> scoreboard setting seems to good.
> Please check pm-myrinet.conf.
> 
> If you want to check of node 65,
> you can use pmini and pmtest.
> Please look at PM/Myrinet test page:
>     http://www.pccluster.org/score/dist/score/html/en/installation/pm-testmyrinet.html
> 
>                        from Kameyama Toyohisa
-- 
_____________________________________________________
Dr. A. St-Cyr
Research Associate, CFD Lab
Department of Mechanical Engineering
McGill University
688 Sherbrooke Street West, 7th floor
Montreal, Qc, Canada H3A 2S6
Tel: +1 (514) 398-1710, Admin. Fax : 2203
amik at cfdlab.mcgill.ca
_____________________________________________________