Re: [OMPI users] Can't read more than 2^31 bytes with MPI_File_read, regardless of type?

2012-08-07 Thread Rayson Ho
I originally thought that it was an issue related to 32-bit executables, but it seems to affect 64-bit as well... I found references to this problem -- it was reported back in 2007: http://lists.mcs.anl.gov/pipermail/mpich-discuss/2007-July/002600.html If you look at the code, you will find

Re: [OMPI users] Can't read more than 2^31 bytes with MPI_File_read, regardless of type?

2012-08-07 Thread Richard Shaw
On Tuesday, 7 August, 2012 at 12:21 PM, Rob Latham wrote: > Hi. Known problem in the ROMIO MPI-IO implementation (which OpenMPI > uses). Been on my list of "things to fix" for a while. Ok, thanks. I'm glad it's not just us. Is there a timescale for this being fixed? Because if it's a long term

Re: [OMPI users] Can't read more than 2^31 bytes with MPI_File_read, regardless of type?

2012-08-07 Thread Rob Latham
On Thu, Jul 12, 2012 at 10:53:52AM -0400, Jonathan Dursi wrote: > Hi: > > One of our users is reporting trouble reading large files with > MPI_File_read (or read_all). With a few different type sizes, to > keep count lower than 2^31, the problem persists. A simple C > program to test this is

[OMPI users] Can't read more than 2^31 bytes with MPI_File_read, regardless of type?

2012-07-12 Thread Jonathan Dursi
Hi: One of our users is reporting trouble reading large files with MPI_File_read (or read_all). With a few different type sizes, to keep count lower than 2^31, the problem persists. A simple C program to test this is attached; we see it in both OpenMPI 1.4.4 and OpenMPI 1.6, with the only