Re: [myrinet] Low bandwidth

Hi,
Please verify that you have set the jumper on the board to 1280 OR that you
set the parameter :
gm_set_speed --speed 1280 in your GM binary directory (and after if needed
in your rc.local for example).
Sincerly,
Dominique Vançon
Alineos : intégration linux - stations, clusters et parallélisation
Tel : 01 64 78 57 65
Fax : 01 64 78 57 66
[email protected]
www.alineos.com
----- Original Message -----
From: "Francesco Lovergine" <[email protected]>
To: <[email protected]>
Sent: Tuesday, July 31, 2001 10:57 AM
Subject: [myrinet] Low bandwidth


>
> Hello folks
>
> I just built up my first beowulf cluster with the latest PCI64B-2
> cards (PCI64C was available just a month later our order :-().
> Hosts are all DEC Alphastation 500/500 (alcor arch). OS is Linux
> with kernel 2.2.19. Buses are 32bits @ 33Mhz so my guess is at least
> a 100-130MBs of throughput. In fact, reality is well different...
> gm_allsize gives me a maximum bandwith of 56MBs.
> Any hints?
>
> PS: This is a Debian GNU/Linux cluster, not the boring RH flavor...
> hip, hip, hurrah for the Debian Project...
>
> --
> Francesco P. Lovergine
>
>