Re: [OMPI users] performance of MPI_Iallgatherv

2014-04-05 Thread Matthieu Brucher
Hi, Try waiting on all gathers at the same time, not one by one (this is what non blocking collectives are made for!) Cheers, Matthieu 2014-04-05 10:35 GMT+01:00 Zehan Cui : > Hi, > > I'm testing the non-blocking collective of OpenMPI-1.8. > > I have two nodes with Infiniband to perform allgath

[OMPI users] performance of MPI_Iallgatherv

2014-04-05 Thread Zehan Cui
Hi, I'm testing the non-blocking collective of OpenMPI-1.8. I have two nodes with Infiniband to perform allgather on totally 128MB data. I split the 128MB data into eight pieces, and perform computation and MPI_Iallgatherv() on one piece of data each iteration, hoping that the MPI_Iallgatherv()

Re: [OMPI users] openmpi query

2014-04-05 Thread Nisha Dhankher -M.Tech(CSE)
Mpirun *--mca btl ^openib --mca btl_tcp_if_include eth0* -np 16 -machinefile mf mpiblast -d all.fas -p blastn -i query.fas -o out.txt was the command i executed on cluster... On Sat, Apr 5, 2014 at 12:34 PM, Nisha Dhankher -M.Tech(CSE) < nishadhankher-coaese...@pau.edu> wrote: > sorry Ralph m

Re: [OMPI users] openmpi query

2014-04-05 Thread Nisha Dhankher -M.Tech(CSE)
sorry Ralph my mistake its not names...it is "it does not happen on same nodes." On Sat, Apr 5, 2014 at 12:33 PM, Nisha Dhankher -M.Tech(CSE) < nishadhankher-coaese...@pau.edu> wrote: > same vm on all machines that is virt-manager > > > On Sat, Apr 5, 2014 at 12:32 PM, Nisha Dhankher -M.Tech(CSE

Re: [OMPI users] openmpi query

2014-04-05 Thread Nisha Dhankher -M.Tech(CSE)
same vm on all machines that is virt-manager On Sat, Apr 5, 2014 at 12:32 PM, Nisha Dhankher -M.Tech(CSE) < nishadhankher-coaese...@pau.edu> wrote: > opmpi version 1.4.3 > > > On Fri, Apr 4, 2014 at 8:13 PM, Ralph Castain wrote: > >> Okay, so if you run mpiBlast on all the non-name nodes, every

Re: [OMPI users] openmpi query

2014-04-05 Thread Nisha Dhankher -M.Tech(CSE)
opmpi version 1.4.3 On Fri, Apr 4, 2014 at 8:13 PM, Ralph Castain wrote: > Okay, so if you run mpiBlast on all the non-name nodes, everything is > okay? What do you mean by "names nodes"? > > > On Apr 4, 2014, at 7:32 AM, Nisha Dhankher -M.Tech(CSE) < > nishadhankher-coaese...@pau.edu> wrote: >