[SCore-users] Slow communication

[Shinji Sumimoto]

Hi.

Have you tuned some paramters in pm-ethernet.conf?

Important parameters are maxnsend and backoff.
If you do not try, could you try it?

The parameters depend on the NIC hardware.
The descriptions of the parameters are:

http://www.pccluster.org/score/dist/score/html/en/man/man5/pm-ether-conf.html

May be following parameter is that you try first.

maxnsend 16
backoff 2400

PS: I have not seen the linux driver for Tamarack 9021.
    Where have you gotten the driver?

Shinji.

From: Jure <jj at guest.xenya.si>
Subject: [SCore-users] Slow communication
Date: Mon, 12 Aug 2002 10:53:41 +0200 (CEST)
Message-ID: <1029142421.3d57779548a5c at webmail.stimm-mz.si>

jj> Hello,
jj> 
jj> I am experimenting with score on two machines. For communication  I first used 
jj> Linksys gigabit coper cards (nc83820) and everything worked well. Then I 
jj> replaced Linksys cards with longshine fiber gigabit cards. 
jj> 
jj> I changed mac addresses in /opt/score/etc/pm-ethernet.conf
jj> and in /opt/score/etc/ndconf/0 and /opt/score/etc/ndconf/1.
jj> 
jj> First I tested the regular mpi communication over tcp and it works
jj> much better on longshine cards than on linksys.
jj> 
jj> However, when I want to run mpitest (rtt, bw, bw2) over pm, the
jj> communication is very, very slow.
jj> 
jj> Is there anything I can do? Did I perhaps forget something in score 
jj> configuration?
jj> 
jj> The chipset on longshine card is Tamarack 9021.
jj> 
jj> I would very much appreciate any hint.
jj> 
jj> Jure
jj> 
jj> 
jj> 
jj> _______________________________________________
jj> SCore-users mailing list
jj> SCore-users at pccluster.org
jj> http://www.pccluster.org/mailman/listinfo/score-users
jj> 
jj> 
------
Shinji Sumimoto, Fujitsu Labs