Your program looks ok, and I could not reproduce the problem on a PVFS1 file system I have access to. Check if your PVFS2 installation works outside of MPI-IO, say with a POSIX I/O equivalent of the same program.
Rajeev > Date: Fri, 16 Nov 2007 20:46:08 -0500 > From: xuechen zhang <[EMAIL PROTECTED]> > Subject: [Pvfs2-users] The unexpected results of running MPI-IO on > PVFS2 > To: [email protected] > Message-ID: <[EMAIL PROTECTED]> > Content-Type: text/plain; charset=UTF-8 > > I just configure my cluster according to the instruction of > quick start. > And everything goes well until I run my first MPI-IO code. > I got the unexpected results which are listed below. > > [EMAIL PROTECTED] exp1]$ mpiexec -np 1 sample > outdata:abcdefghi > Wrote only 5023040 of 10 bytes! > Read only 5023040 of 10 bytes! > Indata:@o?=L > > Here are my codes. Please give me some suggestion. Thank you!. > *************************sample.c**************************** > #include "mpi.h" > #include "mpio.h" > #include <stdio.h> > #include <string.h> > #include <stdlib.h> > > int main(int argc, char *argv[]) > { > MPI_File fh; > MPI_Status status; > int nprocs,rank; > > int count=0; > char outdata[10]={'a', 'b' ,'c', 'd', 'e', 'f', 'g', 'h', 'i', > '\0'}; > char indata[10]; > > MPI_Init(&argc,&argv); > MPI_Comm_size(MPI_COMM_WORLD,&nprocs); > MPI_Comm_rank(MPI_COMM_WORLD,&rank); > > printf("outdata:%s\n",outdata); > > > MPI_File_open(MPI_COMM_WORLD,"/mnt/pvfs2/matrix",MPI_MODE_RDWR| > MPI_MODE_CREATE,MPI_INFO_NULL,&fh); > > MPI_File_seek(fh,rank*10,MPI_SEEK_SET); > > MPI_File_write(fh,outdata,10,MPI_CHAR,&status); > MPI_Get_count(&status,MPI_CHAR,&count); > > if(count!=10) > printf("Wrote only %d of %d bytes!\n",count,10); > > MPI_File_seek(fh,rank*10,MPI_SEEK_SET); > MPI_File_read(fh,indata,10,MPI_CHAR,&status); > MPI_Get_count(&status,MPI_CHAR,&count); > if(count!=10) > printf("Read only %d of %d bytes!\n",count,10); > > printf("Indata:%s\n",indata); > > MPI_File_close(&fh); > > MPI_Barrier(MPI_COMM_WORLD); > > MPI_Finalize(); > } _______________________________________________ Pvfs2-users mailing list [email protected] http://www.beowulf-underground.org/mailman/listinfo/pvfs2-users
