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<TITLE>HPL_equil HPL 2.0 Library Functions September 10, 2008</TITLE> |
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<H1>Name</H1> |
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<B>HPL_equil</B> Equilibrate U and forward the column panel L. |
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<H1>Synopsis</H1> |
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<CODE>#include "hpl.h"</CODE><BR><BR> |
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<CODE>void</CODE> |
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<CODE>HPL_equil(</CODE> |
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<CODE>HPL_T_panel *</CODE> |
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<CODE>PBCST</CODE>, |
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<CODE>int *</CODE> |
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<CODE>IFLAG</CODE>, |
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<CODE>HPL_T_panel *</CODE> |
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<CODE>PANEL</CODE>, |
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<CODE>const enum HPL_TRANS</CODE> |
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<CODE>TRANS</CODE>, |
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<CODE>const int</CODE> |
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<CODE>N</CODE>, |
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<CODE>double *</CODE> |
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<CODE>U</CODE>, |
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<CODE>const int</CODE> |
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<CODE>LDU</CODE>, |
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<CODE>int *</CODE> |
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<CODE>IPLEN</CODE>, |
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<CODE>const int *</CODE> |
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<CODE>IPMAP</CODE>, |
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<CODE>const int *</CODE> |
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<CODE>IPMAPM1</CODE>, |
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<CODE>int *</CODE> |
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<CODE>IWORK</CODE> |
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<CODE>);</CODE> |
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<H1>Description</H1> |
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<B>HPL_equil</B> |
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equilibrates the local pieces of U, so that on exit to |
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this function, pieces of U contained in every process row are of the |
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same size. This phase makes the rolling phase optimal. In addition, |
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this function probes for the column panel L and forwards it when |
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possible. |
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<H1>Arguments</H1> |
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<PRE>
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PBCST (local input/output) HPL_T_panel * |
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On entry, PBCST points to the data structure containing the |
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panel (to be broadcast) information. |
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</PRE>
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<PRE>
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IFLAG (local input/output) int * |
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On entry, IFLAG indicates whether or not the broadcast has |
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already been completed. If not, probing will occur, and the |
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outcome will be contained in IFLAG on exit. |
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</PRE>
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<PRE>
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PANEL (local input/output) HPL_T_panel * |
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On entry, PANEL points to the data structure containing the |
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panel (to be equilibrated) information. |
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</PRE>
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<PRE>
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TRANS (global input) const enum HPL_TRANS |
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On entry, TRANS specifies whether U is stored in transposed |
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or non-transposed form. |
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</PRE>
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<PRE>
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N (local input) const int |
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On entry, N specifies the number of rows or columns of U. N |
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must be at least 0. |
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</PRE>
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<PRE>
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U (local input/output) double * |
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On entry, U is an array of dimension (LDU,*) containing the |
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local pieces of U in each process row. |
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</PRE>
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<PRE>
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LDU (local input) const int |
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On entry, LDU specifies the local leading dimension of U. LDU |
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should be at least MAX(1,IPLEN[nprow]) when U is stored in |
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non-transposed form, and MAX(1,N) otherwise. |
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</PRE>
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<PRE>
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IPLEN (global input) int * |
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On entry, IPLEN is an array of dimension NPROW+1. This array |
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is such that IPLEN[i+1] - IPLEN[i] is the number of rows of U |
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in process IPMAP[i]. |
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</PRE>
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<PRE>
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IPMAP (global input) const int * |
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On entry, IPMAP is an array of dimension NPROW. This array |
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contains the logarithmic mapping of the processes. In other |
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words, IPMAP[myrow] is the absolute coordinate of the sorted |
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process. |
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</PRE>
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<PRE>
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IPMAPM1 (global input) const int * |
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On entry, IPMAPM1 is an array of dimension NPROW. This array |
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contains the inverse of the logarithmic mapping contained in |
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IPMAP: For i in [0.. NPROCS) IPMAPM1[IPMAP[i]] = i. |
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</PRE>
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<PRE>
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IWORK (workspace) int * |
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On entry, IWORK is a workarray of dimension NPROW+1. |
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</PRE>
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<H1>See Also</H1> |
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<A HREF="HPL_pdlaswp01N.html">HPL_pdlaswp01N</A>, |
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<A HREF="HPL_pdlaswp01T.html">HPL_pdlaswp01T</A>. |
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