Attached you will find a small sample code that demonstrates the problem but ether MPI_File_seek() or MPI_File_get_position() is screwing up on me. This only happens with this version of the intel compiler:
Version 14.0.0.080 Build 20130728
You can compile and run the example with:
mpicc -g -DDEBUG mkrandfile.c -o mkrand
mpirun -np 2 mkrand -f data -l 1
1.6.5 works with gcc 4.7.0,
openmpi/1.6.5/gcc/4.7.0
0: my current offset is 0
1: my current offset is 8388608
openmpi/1.6.5/intel/14.0
0: my current offset is 4294967297
1: my current offset is 4294967297
I passed the code through ddt, and the calculations for the offset for each
rank gets the correct values passed to MPI_File_seek() but what I get back from
MPI_File_get_position() is the above gibberish.
I also cannot produce the problem with openmpi/1.6.4/intel/13.0.1 or with
openmpi/1.6.5/pgi/13.5
Our builds all like this:
PREFIX=/home/software/rhel6/openmpi-1.6.5/pgi-13.5
MXM=/home/software/rhel6/mxm/2.0
FCA=/home/software/rhel6/fca/2.5
COMPILERS='CC=pgcc CXX=pgCC FC=pgf90 F77=pgf77'
./configure \
--prefix=${PREFIX} \
--mandir=${PREFIX}/man \
--with-tm=/usr/local/torque \
--with-openib --with-psm \
--with-io-romio-flags='--with-file-system=testfs+ufs+nfs+lustre' \
--with-mxm=$MXM \
--with-fca=$FCA \
--disable-dlopen --enable-shared \
$COMPILERS
Brock Palen
www.umich.edu/~brockp
CAEN Advanced Computing
XSEDE Campus Champion
bro...@umich.edu
(734)936-1985
mkrandfiles.c
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