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Subject: [OMPI users] can you help me please ?thanks
From: ºúÑî (781578278_at_[hidden])
Date: 2013-12-05 04:04:36


My ROCKS cluster includes one frontend and two compute nodes.In my program,I have use the openmpi API such as MPI_Send and MPI_Recv . but when I run the progam with 3 processors . one processor send a message ,other receive message .here are some code.
 int*a=(int*)malloc(sizeof(int)*number);
MPI_Send(a,number, MPI_INT, 1, 1,MPI_COMM_WORLD);
  
  int*b=(int*)malloc(sizeof(int)*number);
MPI_Recv(b, number, MPI_INT, 0, MPI_ANY_TAG, MPI_COMM_WORLD, &status);
  
 when number is least than 10000,it runs fast.
but number is more than 15000,it runs slowly
  
 why?? becesue openmpi API ?? or other problems?

 ------------------ ԭʼÓʼþ ------------------
  ·¢¼þÈË: "Ralph Castain";<rhc_at_[hidden]>;
 ·¢ËÍʱ¼ä: 2013Äê12ÔÂ3ÈÕ(ÐÇÆÚ¶þ) ÖÐÎç1:39
 ÊÕ¼þÈË: "Open MPI Users"<users_at_[hidden]>;
 
 Ö÷Ìâ: Re: [OMPI users] can you help me please ?thanks

 

 
 
 

 On Mon, Dec 2, 2013 at 9:23 PM, ºúÑî <781578278_at_[hidden]> wrote:
 A simple program at my 4-node ROCKS cluster runs fine with command:
/opt/openmpi/bin/mpirun -np 4 -machinefile machines ./sort_mpi6
 

Another bigger programs runs fine on the head node only with command:
 
cd ./sphere; /opt/openmpi/bin/mpirun -np 4 ../bin/sort_mpi6
 
But with the command:
 
cd /sphere; /opt/openmpi/bin/mpirun -np 4 -machinefile ../machines
../bin/sort_mpi6
 
It gives output that:
 
../bin/sort_mpi6: error while loading shared libraries: libgdal.so.1: cannot open
shared object file: No such file or directory
../bin/sort_mpi6: error while loading shared libraries: libgdal.so.1: cannot open
shared object file: No such file or directory
../bin/sort_mpi6: error while loading shared libraries: libgdal.so.1: cannot open
shared object file: No such file or directory
  

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