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HPL_equil(3)		     HPL Library Functions		  HPL_equil(3)

NAME
       HPL_equil - Equilibrate U and forward the column panel L.

SYNOPSIS
       #include "hpl.h"

       void  HPL_equil( HPL_T_panel * PBCST, int * IFLAG, HPL_T_panel * PANEL,
       const enum HPL_TRANS TRANS, const int N, double * U, const int LDU, int
       * IPLEN, const int * IPMAP, const int * IPMAPM1, int * IWORK );

DESCRIPTION
       HPL_equil  equilibrates	 the   local  pieces  of U, so that on exit to
       this function, pieces of U contained in every process row  are  of  the
       same  size.  This  phase makes the rolling phase optimal.  In addition,
       this  function probes  for  the	column panel L and  forwards  it  when
       possible.

ARGUMENTS
       PBCST   (local input/output)    HPL_T_panel *
	       On  entry,   PBCST  points to the data structure containing the
	       panel (to be broadcast) information.

       IFLAG   (local input/output)    int *
	       On entry, IFLAG	indicates  whether or not  the	broadcast  has
	       already	been  completed.  If not,  probing will occur, and the
	       outcome will be contained in IFLAG on exit.

       PANEL   (local input/output)    HPL_T_panel *
	       On entry,  PANEL	 points to the data structure  containing  the
	       panel (to be equilibrated) information.

       TRANS   (global input)	       const enum HPL_TRANS
	       On  entry,  TRANS specifies whether  U  is stored in transposed
	       or non-transposed form.

       N       (local input)	       const int
	       On entry, N  specifies the number of rows or columns of	 U.  N
	       must be at least 0.

       U       (local input/output)    double *
	       On  entry,   U  is an array of dimension (LDU,*) containing the
	       local pieces of U in each process row.

       LDU     (local input)	       const int
	       On entry, LDU specifies the local leading dimension of  U.  LDU
	       should  be  at least MAX(1,IPLEN[nprow]) when  U	 is stored  in
	       non-transposed form, and MAX(1,N) otherwise.

       IPLEN   (global input)	       int *
	       On entry, IPLEN is an array of dimension NPROW+1.   This	 array
	       is  such	 that IPLEN[i+1] - IPLEN[i] is the number of rows of U
	       in process IPMAP[i].

       IPMAP   (global input)	       const int *
	       On entry, IPMAP is an array of dimension	 NPROW.	  This	 array
	       contains	  the	logarithmic mapping of the processes. In other
	       words, IPMAP[myrow]  is the absolute coordinate of  the	sorted
	       process.

       IPMAPM1 (global input)	       const int *
	       On  entry,  IPMAPM1  is an array of dimension NPROW. This array
	       contains	 the inverse of the logarithmic mapping	 contained  in
	       IPMAP: For i in [0.. NPROCS) IPMAPM1[IPMAP[i]] = i.

       IWORK   (workspace)	       int *
	       On entry, IWORK is a workarray of dimension NPROW+1.

SEE ALSO
       HPL_pdlaswp01N (3), HPL_pdlaswp01T (3).

HPL 2.1			       October 26, 2012			  HPL_equil(3)

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