[mvapich-discuss] What's the equivalent option to "--mca btl" of openmpi

[Jianyu Liu]

Hi Hari,
 
Thank you very much for reply.
 
Please see if I have understood correctly
 
1. It only build the default interface detected by configure script into libaray if NOT specify multiple network modules
 
     just like this, it only can run on OpenFabrics,  and can not select TCP at run time
 
      ./configure --prefix=/opt/mvapich2   -with-ib-libpath=/usr/lib64 --with-ib-include=/usr/include --enable-f77 --enable-fc
 
2.  If configured with "--with-device=ch3:nemesis:ib,tcp",  
          it enabled openib, tcp and shared-memory 
          it wil run app on OpenFabrics interface in RDMA mode  by default if not specify any MPICH_NEMESIS_NETMOD options
          it wil run app on OpenFabrics interface in IP over IB mode if specify MPICH_NEMESIS_NETMOD=tcp ( will slower than in RDMA mode)
 
And a few further questions
 
3.  If configured with explicit selection of Shared-Memory-Nemesis
        Is it eanbled at run time by default?
        How to disable/enable  it at run time?
 
4.  Any equivalent options to  btl_openib_ib_min_rnr_timer an btl_openib_ib_timeout of OpenMPI  for optimizing failover timing at run time?

Appreciating your kindly help
 
Jianyu
 
 
From: subramoni.1 at osu.edu
Date: Thu, 13 Mar 2014 09:28:49 -0400
Subject: Re: [mvapich-discuss] What's the equivalent option to "--mca btl" of openmpi
To: jerry_leo at msn.com
CC: mvapich-discuss at cse.ohio-state.edu

Hello Jianyu,

To configure MVAPICH2 use the TCP/IP interface, please follow the instructions available at the following link

http://mvapich.cse.ohio-state.edu/support/user_guide_mvapich2-2.0b.html#x1-190004.11



To run applications using the TCP/IP interface, please follow the instructions available at the following link

http://mvapich.cse.ohio-state.edu/support/user_guide_mvapich2-2.0b.html#x1-400005.2.9



If you configure the MVAPICH2 library to use the TCP/IP interface, it will automatically disable the use of OpenFabrics (IB/iWARP) features. You can still use the OpenFabrics interface in IP over IB mode (just like a high performance GigE adapter).



Please let us know if you have any further questions.

Regards,
Hari.


On Thu, Mar 13, 2014 at 5:17 AM, Jianyu Liu <jerry_leo at msn.com> wrote:





Dear Sir/Madam,
 
I'd like to set certain run-time characteristics of MPI  communications.  
 
What's the equivalent options of MVAPICH2  to these "--mca btl" options of OpenMPI? 


 
#  Specify to use the TCP network for MPI messages
1 ) mpirun  --mca btl tcp,self ...
 
#  Top explicitly disable the OpenFabrics network
2) mpirun --mca btl ^openib  ...
 
#  Optimizing Failover Timing


3)  mpirun --mca btl_openib_ib_min_rnr_timer 25  btl_openib_ib_timeout 20 ...
 
 
Thanks for your time
 
Regards
 
Jianyu
 		 	   		  



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