Re: [myrinet] Low bandwidth
Clemens Adler <[email protected]>
| Newsgroups | gmane.network.myrinet.general |
|---|---|
| Message-ID | <[email protected]> |
Hi, I would guess that's just the limit of your PCI bus. With old 32 bit cards in an XP1000 (which supposedly has one of the best PCI implementations) we measured something like 70-80 MB/s peak bandwidth. And I belive that the older alpha's had not the best PCI implementation, so the value of 56 MB/s doesn't sound too far off. cheers, Clemens On Tue, 31 Jul 2001, Francesco Lovergine wrote: > > 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... > > -- ________________________________________________________________ Clemens Adler phone: (631)344-8334 Bldg. 510A email: [email protected] Brookhaven National Lab Upton N.Y. 11973 Office: Bldg. 118 Rm. 103 ________________________________________________________________