Hi all, I have installed PVFS2 in 2 PCS with Gigabit Network between them. I am doing write and read tests between NFS and PVFS2.
I developed a program in MPI that uses 2 processes to write to separate discs in PVFS2, and after this, the program measure time taken to write file until time to read this one recently created. And i developed another program in MPI where 2 processes create a vector itself, and in this case, process 1 pass it vector to process 0, and process 0 gather itself vector and another from process 1. After gather this one, it write to a file. And later i read with only one process the whole file that have created. I think that the program with PVFS2 should be faster than this second program that uses NFS, due to the fact of mpi application that uses PVFS2, each process write to a file, without communication. But the result is the oposite of that. Is this behavior correct? In what situations PVFS2 would be better than NFS? Thanks Luiz Mendes
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