Re: [OMPI users] performance of MPI_Iallgatherv

Hi Matthieu, Thanks for your suggestion. I tried MPI_Waitall(), but the results are the same. It seems the communication didn't overlap with computation. Regards, Zehan On 4/5/14, Matthieu Brucher wrote: > Hi, > > Try waiting on all gathers at the same time, not one by one (this is > what non b

[OMPI users] Openmpi 1.8 "rmaps seq" doesn't work

Hi , I just tried the openmpi 1.8, but I found the feature --mca rmaps seq doesn't work. for example, >mpirun -np 4 -hostfile hostsfle --mca rmaps seq hostname It shows below error, -- Your job failed to map. Either no map

[OMPI users] OpenMPI 1.8.0 + PGI 13.6 = undeclared variable __LDBL_MANT_DIG__

Dear all, I am trying to compile Open MPI 1.8 with PGI 13.6. I am using on purpose this old version of PGI because of results and performance comparisons with old benchmarks. I run configure in this way: ./configure CC=pgcc CXX=pgCC FC=pgf90 F90=pgfortran CFLAGS="-noswitcherror" FCFLAGS="-no