Re: [OMPI users] mpirun problem when running on more than three hosts with OpenMPI 1.8

2014-04-14 Thread Ralph Castain
On Apr 13, 2014, at 11:42 AM, Allan Wu wrote: > Thanks, Ralph! > > Adding MAC parameter 'plm_rsh_no_tree_spawn' solves the problem. > > If I understand correctly, the first layer of daemons are three nodes, and > when there are more than three nodes the second layer of daemons are spawn. >

Re: [OMPI users] mpirun problem when running on more than three hosts with OpenMPI 1.8

2014-04-13 Thread Allan Wu
Thanks, Ralph! Adding MAC parameter ' plm_rsh_no_tree_spawn' solves the problem. If I understand correctly, the first layer of daemons are three nodes, and when there are more than three nodes the second layer of daemons are spawn. So my problem is happened when MPI processes are launched by the

Re: [OMPI users] mpirun problem when running on more than three hosts with OpenMPI 1.8

2014-04-11 Thread Ralph Castain
The problem is with the tree-spawn nature of the rsh/ssh launcher. For scalability, mpirun only launches a first "layer" of daemons. Each of those daemons then launches another layer in a tree-like fanout. The default pattern is such that you first notice it when you have four nodes in your allo

Re: [OMPI users] mpirun problem

2009-03-04 Thread Ralph Castain
I suppose one initial question is: what version of Open MPI are you running? OMPI 1.3 should not be attempting to ssh a daemon on a local job like this - OMPI 1.2 -will-, so it is important to know which one we are talking about. Just do "mpirun --version" and it should tell you. Ralph O

Re: [OMPI users] mpirun problem

2009-03-04 Thread Jeff Squyres
Sorry for the delay in replying; the usual INBOX deluge keeps me from being timely in replying to all mails... More below. On Feb 24, 2009, at 6:52 AM, Jovana Knezevic wrote: I'm new to MPI, so I'm going to explain my problem in detail I'm trying to compile a simple application using mpicc (

Re: [OMPI users] mpirun problem

2006-04-27 Thread Brian Barrett
On Apr 27, 2006, at 12:09 PM, sdamjad wrote: I can not find mpirun or mpicc executables. Hence i send the logs It's generally useful to include that information in your report - I couldn't tell what problem you were having from your log files. Anyway, I would guess that the problem you ar