Re: [OMPI users] MPI_Send doesn't work if the data >= 2GB

Hi Bowen, Thanks very much. I had checked my writev system call, I thought it was him that caused all these bad things :) Best Regards Xianjun Meng 2010/12/8 Bowen Zhou > On 12/05/2010 10:13 PM, > >> hi, >> >> I met a question recently when I tested the MPI_send and

Re: [OMPI users] MPI_Send doesn't work if the data >= 2GB

On 12/05/2010 10:13 PM, hi, I met a question recently when I tested the MPI_send and MPI_Recv functions. When I run the following codes, the processes hanged and I found there was not data transmission in my network at all. BTW: I finished this test on two X86-64 computers with 16GB memory

Re: [OMPI users] MPI_Send doesn't work if the data >= 2GB

Hi Gus Correa First of all, thanks for your suggestions. 1) The malloc function do return a non_NULL pointer. 2) I didn't tried the MPI_Isend function, actually, The really function I need to use is MPI_Allgatherv(). When I used it, I found this function didn't work when the the data >= 2GB,

Re: [OMPI users] MPI_Send doesn't work if the data >= 2GB

Hi Xianjun Suggestions/Questions: 1) Did you check if malloc returns a non-NULL pointer? Your program is assuming this, but it may not be true, and in this case the problem is not with MPI. You can print a message and call MPI_Abort if it doesn't. 2) Have you tried MPI_Isend/MPI_Irecv? Or

Re: [OMPI users] MPI_Send doesn't work if the data >= 2GB

Hi Are you running on two processes (mpiexec -n 2)? Yes Have you tried to print Gsize? Yes, I had checked my codes several times, and I thought the errors came from the OpenMpi. :) The command line I used: "mpirun -hostfile ./Serverlist -np 2 ./test". The "Serverlist" file include several

Re: [OMPI users] MPI_Send doesn't work if the data >= 2GB

Hi Xianjun Are you running on two processes (mpiexec -n 2)? I think this code will deadlock for more than two processes. The MPI_Recv won't have a matching send for rank>1. Also, this is C, not MPI, but you may be wrapping into the negative numbers. Have you tried to print Gsize? It is probably

Re: [OMPI users] MPI_Send doesn't work if the data >= 2GB

Hi, What interconnect and command line do you use? For InfiniBand openib component there is a known issue with large transfers (2GB) https://svn.open-mpi.org/trac/ompi/ticket/2623 try disabling memory pinning: http://www.open-mpi.org/faq/?category=openfabrics#large-message-leave-pinned regards

Re: [OMPI users] MPI_Send doesn't work if the data >= 2GB

hi, In my computers(X86-64), the sizeof(int)=4, but the sizeof(long)=sizeof(double)=sizeof(size_t)=8. when I checked my mpi.h file, I found that the definition about the sizeof(int) is correct. meanwhile, I think the mpi.h file was generated according to my compute environment when I compiled the