On Sat, 27 Sep 2003, Richard Drake wrote:
> i just downloaded and installed 6.7.0 on a linux cluster using PBS and
I think you mean 7.0. :-)
> using GM. i like the ability of lamboot to recognize the nodes
> available by PBS so that a boot schema file is not needed, nice!
Woo hoo!
> however, i am concerned that lamboot is not using the Myrinet comm
> fabric, but rather the ethernet.
>
> with a boot schema, one puts "node07-myri0" instead of just "node07" to
> trigger the Myrinet fabric.
Is there a reason you're using the IP layer over Myrinet instead of native
Myrinet? The IP layer over Myrinet adds a little more latency and reduces
available bandwidth as compared to native Myrinet.
Specifically -- if you lamboot across either IP layer (ethernet or IP
Myrinet) and then use the "gm" RPI module, you'll be using the native
Myrinet interface (which obviously doesn't require any IP addresses).
You can check to see if you compiled in support for native Myrinet by
running "laminfo" and see if you see the gm RPI module lised. If it's
not, double check your ./configure settings from when you installed LAM.
Ensure to specify --with-gm=/path/to/gm/installation. See the Install
Guide, section 5.2.4.
Note that 7.0.1 is due out "shortly", and will contain support for both gm
1.6.x and 2.0.x.
--
{+} Jeff Squyres
{+} jsquyres_at_[hidden]
{+} http://www.lam-mpi.org/
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