Several libraries have been updated on hexagon. For maximum performance and stability users are encouraged to log out and in again and then recompile their programs and libraries.

MPI
xt-mpt 3.1.2 -> 3.2.0

Libs/math:
xt-libsci 10.3.3 -> 10.3.4
hdf5 1.8.2.1 -> 1.8.2.2
netcdf_hdf5parallell 4.0.0.1 -> 4.0.0.2
netcdf 4.0.0.1 -> 4.0.0.2

Compiler:
xt-asyncpe (wrapper) 2.3 -> 2.4
pgi 8.0.4 -> 8.0.5

NOTES:

xt-mpt

MPI-IO performance improvements for collective buffering on MPI collective
writes.

This optimization is enabled by setting the MPIIO hint romio_cb_write to "enable" and setting the environment variable MPICH_MPIIO_CB_ALIGN to 2. Other values of this environment variable are 0 and 1, where 0 is for the original algorithm in MPT 3.0 and earlier and 1 is for the algorithm introduced in MPT 3.1. The MPICH_MPIIO_CB_ALIGN section of the "mpi" man page gives more details. If you are not already using collective buffering, read the MPICH_MPIIO_HINTS section for more information.

xt-libsci

SuperLU has been removed from xt-libsci release. It is released with the PETSc 3.0.0.1 and later releases. The xt-libsci module no longer loads the fftw module by default.

fftw

Performance improvements for some multidimensional r2c/c2r transforms.
Fortran documentation now recommends not using dfftw_execute, because of reports of problems with various Fortran compilers; it is better to use dfftw_execute_dft etc.