Hi all, <div><br></div><div>I noticed a strange behaviour in 1.5.4 which seems to me as a bug. I&#39;m trying to launch 4 ranks on 2 nodes. If I add &quot;-npernode 3 -bynode&quot; parameters mpirun freezes on start. When I tried with the &quot;-display-map&quot; parameter it shows the following:</div>
<div><div>./mpirun --np 4 --host mir1,mir2 -npernode 3 -display-map -bynode ./hello </div><div><br></div><div> ========================   JOB MAP   ========================</div><div><br></div><div> Data for node: mir1    Num procs: 3</div>
<div>        Process OMPI jobid: [42759,1] Process rank: 0</div><div>        Process OMPI jobid: [42759,1] Process rank: 2</div><div>        Process OMPI jobid: [42759,1] <b>Process rank: 4</b></div><div><br></div><div> Data for node: mir2    Num procs: 1</div>
<div>        Process OMPI jobid: [42759,1] Process rank: 1</div></div><div><br></div><div>Which seems as a problem since there supposed to be no rank #4 as np=4.</div><div><br></div><div>I&#39;ve also tried with trunk. The application also freezes but does not show the map of ranks.</div>
<div><br></div><div>Could you please assist if this is a bug or I&#39;m doing something improperly?</div><div><br></div><div>Regards, </div><div>Andrew Senin</div><div><br></div><div><br></div>