Visible to Intel only — GUID: GUID-5D4E6211-327D-48CE-A3FC-73B558C356ED
Visible to Intel only — GUID: GUID-5D4E6211-327D-48CE-A3FC-73B558C356ED
pilaenv
Returns the positive integer value of the logical blocking size.
Syntax
value = pilaenv (ictxt, prec )
Include Files
- mkl_pblas.h
Description
pilaenv returns the positive integer value of the logical blocking size. This value is machine and precision specific. This version provides a logical blocking size which should give good though not optimal performance on many of the currently available distributed-memory concurrent computers. You are encouraged to modify this subroutine to set this tuning parameter for your particular machine.
Input Parameters
- ictxt
-
INTEGER. On entry, ictxt specifies the BLACS context handle, indicating the global context of the operation. The context itself is global, but the value of ictxt is local.
- prec
-
CHARACTER*1. On input, prec specifies the precision for which the logical block size should be returned as follows:
prec = 'S' or 's' single precision real,
prec = 'D' or 'd' double precision real,
prec = 'C' or 'c' single precision complex,
prec = 'Z' or 'z' double precision complex,
prec = 'I' or 'i' integer.
Application Notes
Before modifying this routine to tune the library performance on your system, be aware of the following:
The value this function returns must be strictly larger than zero,
If you are planning to link your program with different instances of the library (for example, on a heterogeneous machine), you must compile each instance of the library with exactly the same version of this routine for obvious interoperability reasons.