Environment Variables

VARIABLE ALLOWED VALUES DEFAULT
IOMETHOD
 POSIX, MPI
 POSIX
IOMODE
 SYNC, ASYNC
 SYNC
FILETYPE
 UNIQUE, SHARED
 UNIQUE
REMAP
 CUSTOM, SCALAPACK
 CUSTOM
BWEXP
 Any number
 None

NOTES

(i) The remap options are only used in multi-gang mode; the custom remap is provided for cases where the ScaLAPACK remap function (pdgemr2d) performs poorly or fails.

(ii) The busy-work exponent, BWEXP, sets the amount of busy-work done as a function of the IO data size.  For N data elements written/read the busy-work function will perform NBWEXP floating-point operations.

If the IO data are thought of as matrices, as in the parent application, then
BWEXP = 1.0 corresponds to level 2 BLAS
BWEXP = 1.5 corresponds to level 3 BLAS

If the IO data are thought of as vectors then
BWEXP = 1.0 corresponds to level 1 BLAS
BWEXP = 2.0 corresponds to level 2 BLAS