Shared Memory usage in -machinefile

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Hi,

as we are just on this matter: in the README-mpich-gm (mpich-1.2.5..12) I=
 found=20
this:

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

   # the list of nodes that make the MPI World
   node1.myri.com:4
   node2.myri.com 0
   node2.myri.com 1
   node2.myri.com 0
   node2.myri.com 1
   node3.myri.com
   node4.myri.com
   # end of machine file
  =20
   <snip>

   To set up the machine file for SMP use, you can simply list the SMP ma=
chine
   N times (one for each processor), or add the number of processors next=
 to=20
   the hostname (separated by a colon).  The example above uses two SMP=20
   machines (node1 and node2), each of which has 4 processors, and two=20
   uni-processor machine (node3 and node4).

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

The default behavior is different in MPICH (with compiled -comm=3Dshared)=
:

node00
node00

will have two shared memory segments.

node00:2

will allocate only one shared memory segment (please see also the attachm=
ent,=20
Option 2).

Question is: how is Myrinet behaving in this case? Different from the def=
ault=20
MPICH, or could the above statement give under some circumstances a less=20
optimal result?

Thx & Cheers - Reuti
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