[openib-general] IB MTU tunable for uDAPL and/or Intel MPI?

Fri, 09 Jun 2006 10:46:48 -0700

While we're talking about MTUs, is the IB MTU tunable in uDAPL and/or Intel MPI via env var or config file?
 
Looks like Intel MPI 2.0.1 uses 2K for IB MTU like MVAPICH does in OFED 1.0 rc4 and rc6, I'd like to try 1K with Intel MPI.
 
Scott

From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Scott Weitzenkamp (sweitzen)
Sent: Thursday, June 08, 2006 4:38 PM
To: Tziporet Koren; [EMAIL PROTECTED]
Cc: openib-general
Subject: RE: [openib-general] OFED-1.0-rc6 is available

The MTU change undos the changes for bug 81, so I have reopened bug 81 (http://openib.org/bugzilla/show_bug.cgi?id=81).
 
With rc6, PCI-X osu_bw and osu_bibw performance is bad, and PCI-E osu_bibw performance is bad.  I've enclosed some performance data, look at rc4 vs rc5 vs rc6 for Cougar/Cheetah/LionMini.
 
Are there other benchmarks driving the changes in rc6 (and rc4)?
 
Scott Weitzenkamp
SQA and Release Manager
Server Virtualization Business Unit
Cisco Systems
 

 

OSU MPI:

·        Added mpi_alltoall fine tuning parameters

·        Added default configuration/documentation file $MPIHOME/etc/mvapich.conf

·        Added shell configuration files  $MPIHOME/etc/mvapich.csh , $MPIHOME/etc/mvapich.csh

·        Default MTU was changed back to 2K for InfiniHost III Ex and InfiniHost III Lx HCAs. For InfiniHost card recommended value is:
VIADEV_DEFAULT_MTU=MTU1024

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