Dear Hammad, Can you please have a RUN with "sufficiently Larger Problem Instance"? Then see what happens!! Sufficient----may be 10 times greater than that you used.
best regards, Amjad Ali. On Fri, Mar 12, 2010 at 3:10 AM, Hammad Siddiqi <hammad.sidd...@seecs.edu.pk > wrote: > Dear All, > Is this the correct forum for sending these kind of emails. please let me > know if there is some other mailing list. > Thank > Best Regards, > Hammad Siddiqi > System Administrator, > Centre for High Performance Scientific Computing, > School of Electrical Engineering and Computer Science, > National University of Sciences and Technology, > H-12, Islamabad. > Office : +92 (51) 90852207 > Web: > http://hpc.seecs.nust.edu.pk/~hammad/<http://hpc.seecs.nust.edu.pk/%7Ehammad/> > > > On Sat, Feb 27, 2010 at 10:07 PM, Hammad Siddiqi < > hammad.sidd...@seecs.edu.pk> wrote: > >> Dear All, >> >> I am facing very wierd results of OpenMPI 1.4.1 on Amazon EC2. I have >> used Small Instance and and High CPU medium instance for benchmarking >> latency and bandwidth. The OpenMPI was configured with the default >> options. when the code is run in the cluster mode the latency and >> bandwidth of Amazon EC2 Small instance is really less than that of >> Amazon EC2 High CPU medium instance. To my understanding the >> difference should not be that much. The following are the links to >> graphs ad their data: >> >> Data: >> http://hpc.seecs.nust.edu.pk/~hammad/OpenMPI,Latency-BandwidthData.jpg<http://hpc.seecs.nust.edu.pk/%7Ehammad/OpenMPI,Latency-BandwidthData.jpg> >> Graphs: >> http://hpc.seecs.nust.edu.pk/~hammad/OpenMPI,Latency-Bandwidth.jpg<http://hpc.seecs.nust.edu.pk/%7Ehammad/OpenMPI,Latency-Bandwidth.jpg> >> >> >> Please have a look on them. >> >> Is anyone else facing the same problem. Any guidance in this regard >> will highly be appreciated. >> >> Thank you. >> >> >> -- >> Best Regards, >> Hammad Siddiqi >> System Administrator, >> Centre for High Performance Scientific Computing, >> School of Electrical Engineering and Computer Science, >> National University of Sciences and Technology, >> H-12, Islamabad. >> Office : +92 (51) 90852207 >> > > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users >
