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| 2 | 1 | equemene | <HEAD>
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| 3 | 1 | equemene | <TITLE>HPL_equil HPL 2.0 Library Functions September 10, 2008</TITLE> |
| 4 | 1 | equemene | </HEAD>
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| 5 | 1 | equemene | |
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| 8 | 1 | equemene | |
| 9 | 1 | equemene | <H1>Name</H1> |
| 10 | 1 | equemene | <B>HPL_equil</B> Equilibrate U and forward the column panel L. |
| 11 | 1 | equemene | |
| 12 | 1 | equemene | <H1>Synopsis</H1> |
| 13 | 1 | equemene | <CODE>#include "hpl.h"</CODE><BR><BR> |
| 14 | 1 | equemene | <CODE>void</CODE> |
| 15 | 1 | equemene | <CODE>HPL_equil(</CODE> |
| 16 | 1 | equemene | <CODE>HPL_T_panel *</CODE> |
| 17 | 1 | equemene | <CODE>PBCST</CODE>, |
| 18 | 1 | equemene | <CODE>int *</CODE> |
| 19 | 1 | equemene | <CODE>IFLAG</CODE>, |
| 20 | 1 | equemene | <CODE>HPL_T_panel *</CODE> |
| 21 | 1 | equemene | <CODE>PANEL</CODE>, |
| 22 | 1 | equemene | <CODE>const enum HPL_TRANS</CODE> |
| 23 | 1 | equemene | <CODE>TRANS</CODE>, |
| 24 | 1 | equemene | <CODE>const int</CODE> |
| 25 | 1 | equemene | <CODE>N</CODE>, |
| 26 | 1 | equemene | <CODE>double *</CODE> |
| 27 | 1 | equemene | <CODE>U</CODE>, |
| 28 | 1 | equemene | <CODE>const int</CODE> |
| 29 | 1 | equemene | <CODE>LDU</CODE>, |
| 30 | 1 | equemene | <CODE>int *</CODE> |
| 31 | 1 | equemene | <CODE>IPLEN</CODE>, |
| 32 | 1 | equemene | <CODE>const int *</CODE> |
| 33 | 1 | equemene | <CODE>IPMAP</CODE>, |
| 34 | 1 | equemene | <CODE>const int *</CODE> |
| 35 | 1 | equemene | <CODE>IPMAPM1</CODE>, |
| 36 | 1 | equemene | <CODE>int *</CODE> |
| 37 | 1 | equemene | <CODE>IWORK</CODE> |
| 38 | 1 | equemene | <CODE>);</CODE> |
| 39 | 1 | equemene | |
| 40 | 1 | equemene | <H1>Description</H1> |
| 41 | 1 | equemene | <B>HPL_equil</B> |
| 42 | 1 | equemene | equilibrates the local pieces of U, so that on exit to |
| 43 | 1 | equemene | this function, pieces of U contained in every process row are of the |
| 44 | 1 | equemene | same size. This phase makes the rolling phase optimal. In addition, |
| 45 | 1 | equemene | this function probes for the column panel L and forwards it when |
| 46 | 1 | equemene | possible. |
| 47 | 1 | equemene | |
| 48 | 1 | equemene | <H1>Arguments</H1> |
| 49 | 1 | equemene | <PRE>
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| 50 | 1 | equemene | PBCST (local input/output) HPL_T_panel * |
| 51 | 1 | equemene | On entry, PBCST points to the data structure containing the |
| 52 | 1 | equemene | panel (to be broadcast) information. |
| 53 | 1 | equemene | </PRE>
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| 54 | 1 | equemene | <PRE>
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| 55 | 1 | equemene | IFLAG (local input/output) int * |
| 56 | 1 | equemene | On entry, IFLAG indicates whether or not the broadcast has |
| 57 | 1 | equemene | already been completed. If not, probing will occur, and the |
| 58 | 1 | equemene | outcome will be contained in IFLAG on exit. |
| 59 | 1 | equemene | </PRE>
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| 60 | 1 | equemene | <PRE>
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| 61 | 1 | equemene | PANEL (local input/output) HPL_T_panel * |
| 62 | 1 | equemene | On entry, PANEL points to the data structure containing the |
| 63 | 1 | equemene | panel (to be equilibrated) information. |
| 64 | 1 | equemene | </PRE>
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| 65 | 1 | equemene | <PRE>
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| 66 | 1 | equemene | TRANS (global input) const enum HPL_TRANS |
| 67 | 1 | equemene | On entry, TRANS specifies whether U is stored in transposed |
| 68 | 1 | equemene | or non-transposed form. |
| 69 | 1 | equemene | </PRE>
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| 70 | 1 | equemene | <PRE>
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| 71 | 1 | equemene | N (local input) const int |
| 72 | 1 | equemene | On entry, N specifies the number of rows or columns of U. N |
| 73 | 1 | equemene | must be at least 0. |
| 74 | 1 | equemene | </PRE>
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| 75 | 1 | equemene | <PRE>
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| 76 | 1 | equemene | U (local input/output) double * |
| 77 | 1 | equemene | On entry, U is an array of dimension (LDU,*) containing the |
| 78 | 1 | equemene | local pieces of U in each process row. |
| 79 | 1 | equemene | </PRE>
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| 80 | 1 | equemene | <PRE>
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| 81 | 1 | equemene | LDU (local input) const int |
| 82 | 1 | equemene | On entry, LDU specifies the local leading dimension of U. LDU |
| 83 | 1 | equemene | should be at least MAX(1,IPLEN[nprow]) when U is stored in |
| 84 | 1 | equemene | non-transposed form, and MAX(1,N) otherwise. |
| 85 | 1 | equemene | </PRE>
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| 86 | 1 | equemene | <PRE>
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| 87 | 1 | equemene | IPLEN (global input) int * |
| 88 | 1 | equemene | On entry, IPLEN is an array of dimension NPROW+1. This array |
| 89 | 1 | equemene | is such that IPLEN[i+1] - IPLEN[i] is the number of rows of U |
| 90 | 1 | equemene | in process IPMAP[i]. |
| 91 | 1 | equemene | </PRE>
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| 92 | 1 | equemene | <PRE>
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| 93 | 1 | equemene | IPMAP (global input) const int * |
| 94 | 1 | equemene | On entry, IPMAP is an array of dimension NPROW. This array |
| 95 | 1 | equemene | contains the logarithmic mapping of the processes. In other |
| 96 | 1 | equemene | words, IPMAP[myrow] is the absolute coordinate of the sorted |
| 97 | 1 | equemene | process. |
| 98 | 1 | equemene | </PRE>
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| 99 | 1 | equemene | <PRE>
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| 100 | 1 | equemene | IPMAPM1 (global input) const int * |
| 101 | 1 | equemene | On entry, IPMAPM1 is an array of dimension NPROW. This array |
| 102 | 1 | equemene | contains the inverse of the logarithmic mapping contained in |
| 103 | 1 | equemene | IPMAP: For i in [0.. NPROCS) IPMAPM1[IPMAP[i]] = i. |
| 104 | 1 | equemene | </PRE>
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| 105 | 1 | equemene | <PRE>
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| 106 | 1 | equemene | IWORK (workspace) int * |
| 107 | 1 | equemene | On entry, IWORK is a workarray of dimension NPROW+1. |
| 108 | 1 | equemene | </PRE>
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| 109 | 1 | equemene | |
| 110 | 1 | equemene | <H1>See Also</H1> |
| 111 | 1 | equemene | <A HREF="HPL_pdlaswp01N.html">HPL_pdlaswp01N</A>, |
| 112 | 1 | equemene | <A HREF="HPL_pdlaswp01T.html">HPL_pdlaswp01T</A>. |
| 113 | 1 | equemene | |
| 114 | 1 | equemene | </BODY>
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