[MPICH] build mpich2 with Myrinet GM

[Darius Buntinas]

On 02/26/2008 10:08 AM, Wei-keng Liao wrote:
> I have a few questions on build mpich2-1.0.6p1 with Myrinet GM library.
> 
> On my target machine, the GM library (include, lib, bin, etc.) is in 
> /opt/gm. According to MPICH README, I used the 2 options below when 
> configuring: 
>     --with-device=ch3:nemesis:gm  and --with-gm=/opt/gm
> 
> I can see both libgm.a and libgm.so are in /opt/gm/lib.
> 
> Q1: Do I need other configure options or setting environment variables
>     (in addition to CC, FC, CXX, F90)? Should I set LDFLAGS 
>     to "-L/opt/gm/lib -lgm" ?

Nope, the --with-gm=/opt/gm should take care of all of that for you.

> Q2: Since nemesis does not support MPI dynamic process routines yet and I 
>     need those routines, can I use --with-device=ch3:sock:gm instead?

No, only nemesis supports gm.

> Q3: Do I need anything else (source codes, library) from Myrinet to build 
>     mpich? Or the /opt/gm is good enough?

All you need is libgm.a and gm.h.

> Q4: Once the mpich is built, is there a way to verify that GM is actually 
>     used?

Well, you should see a performance improvement over using sockets.  Run 
a ping-pong test; you should see latencies around 10us or less.

-d