Re: [OMPI users] maximum size for read buffer in MPI_File_read/write

2011-09-28 Thread German Hoecht
Hi Rob, thanks for your comments. I understand that it's most probably not worth the effort to find the actual reason. Because I have to deal with very large files I preferred using "std::numeric_limits::max()" rather than a hard-coded value to split the read in case an IO request exceeds this am

Re: [OMPI users] maximum size for read buffer in MPI_File_read/write

2011-09-27 Thread Rob Latham
On Thu, Sep 22, 2011 at 11:37:10PM +0200, German Hoecht wrote: > Hello, > > MPI_File_read/write functions uses an integer to specify the size of > the buffer, for instance: > int MPI_File_read(MPI_File fh, void *buf, int count, MPI_Datatype > datatype, MPI_Status *status) > with: > count Numb

[OMPI users] maximum size for read buffer in MPI_File_read/write

2011-09-22 Thread German Hoecht
Hello, MPI_File_read/write functions uses an integer to specify the size of the buffer, for instance: int MPI_File_read(MPI_File fh, void *buf, int count, MPI_Datatype datatype, MPI_Status *status) with: count Number of elements in buffer (integer). datatype Data type of each buffer element