root / www / HPL_spreadN.html
Historique | Voir | Annoter | Télécharger (3,92 ko)
| 1 |
<HTML>
|
|---|---|
| 2 |
<HEAD>
|
| 3 |
<TITLE>HPL_spreadN HPL 2.0 Library Functions September 10, 2008</TITLE> |
| 4 |
</HEAD>
|
| 5 |
|
| 6 |
<BODY BGCOLOR="WHITE" TEXT = "#000000" LINK = "#0000ff" VLINK = "#000099" |
| 7 |
ALINK = "#ffff00"> |
| 8 |
|
| 9 |
<H1>Name</H1> |
| 10 |
<B>HPL_spreadN</B> Spread row panel U and forward current column panel. |
| 11 |
|
| 12 |
<H1>Synopsis</H1> |
| 13 |
<CODE>#include "hpl.h"</CODE><BR><BR> |
| 14 |
<CODE>void</CODE> |
| 15 |
<CODE>HPL_spreadN(</CODE> |
| 16 |
<CODE>HPL_T_panel *</CODE> |
| 17 |
<CODE>PBCST</CODE>, |
| 18 |
<CODE>int *</CODE> |
| 19 |
<CODE>IFLAG</CODE>, |
| 20 |
<CODE>HPL_T_panel *</CODE> |
| 21 |
<CODE>PANEL</CODE>, |
| 22 |
<CODE>const enum HPL_SIDE</CODE> |
| 23 |
<CODE>SIDE</CODE>, |
| 24 |
<CODE>const int</CODE> |
| 25 |
<CODE>N</CODE>, |
| 26 |
<CODE>double *</CODE> |
| 27 |
<CODE>U</CODE>, |
| 28 |
<CODE>const int</CODE> |
| 29 |
<CODE>LDU</CODE>, |
| 30 |
<CODE>const int</CODE> |
| 31 |
<CODE>SRCDIST</CODE>, |
| 32 |
<CODE>const int *</CODE> |
| 33 |
<CODE>IPLEN</CODE>, |
| 34 |
<CODE>const int *</CODE> |
| 35 |
<CODE>IPMAP</CODE>, |
| 36 |
<CODE>const int *</CODE> |
| 37 |
<CODE>IPMAPM1</CODE> |
| 38 |
<CODE>);</CODE> |
| 39 |
|
| 40 |
<H1>Description</H1> |
| 41 |
<B>HPL_spreadN</B> |
| 42 |
spreads the local array containing local pieces of U, so |
| 43 |
that on exit to this function, a piece of U is contained in every |
| 44 |
process row. The array IPLEN contains the number of rows of U, that |
| 45 |
should be spread on any given process row. This function also probes |
| 46 |
for the presence of the column panel PBCST. In case of success, this |
| 47 |
panel will be forwarded. If PBCST is NULL on input, this probing |
| 48 |
mechanism will be disabled. |
| 49 |
|
| 50 |
<H1>Arguments</H1> |
| 51 |
<PRE>
|
| 52 |
PBCST (local input/output) HPL_T_panel * |
| 53 |
On entry, PBCST points to the data structure containing the |
| 54 |
panel (to be broadcast) information. |
| 55 |
</PRE>
|
| 56 |
<PRE>
|
| 57 |
IFLAG (local input/output) int * |
| 58 |
On entry, IFLAG indicates whether or not the broadcast has |
| 59 |
already been completed. If not, probing will occur, and the |
| 60 |
outcome will be contained in IFLAG on exit. |
| 61 |
</PRE>
|
| 62 |
<PRE>
|
| 63 |
PANEL (local input/output) HPL_T_panel * |
| 64 |
On entry, PANEL points to the data structure containing the |
| 65 |
panel (to be spread) information. |
| 66 |
</PRE>
|
| 67 |
<PRE>
|
| 68 |
SIDE (global input) const enum HPL_SIDE |
| 69 |
On entry, SIDE specifies whether the local piece of U located |
| 70 |
in process IPMAP[SRCDIST] should be spread to the right or to |
| 71 |
the left. This feature is used by the equilibration process. |
| 72 |
</PRE>
|
| 73 |
<PRE>
|
| 74 |
N (global input) const int |
| 75 |
On entry, N specifies the local number of columns of U. N |
| 76 |
must be at least zero. |
| 77 |
</PRE>
|
| 78 |
<PRE>
|
| 79 |
U (local input/output) double * |
| 80 |
On entry, U is an array of dimension (LDU,*) containing the |
| 81 |
local pieces of U. |
| 82 |
</PRE>
|
| 83 |
<PRE>
|
| 84 |
LDU (local input) const int |
| 85 |
On entry, LDU specifies the local leading dimension of U. LDU |
| 86 |
should be at least MAX(1,IPLEN[nprow]). |
| 87 |
</PRE>
|
| 88 |
<PRE>
|
| 89 |
SRCDIST (local input) const int |
| 90 |
On entry, SRCDIST specifies the source process that spreads |
| 91 |
its piece of U. |
| 92 |
</PRE>
|
| 93 |
<PRE>
|
| 94 |
IPLEN (global input) const int * |
| 95 |
On entry, IPLEN is an array of dimension NPROW+1. This array |
| 96 |
is such that IPLEN[i+1] - IPLEN[i] is the number of rows of U |
| 97 |
in each process before process IPMAP[i], with the convention |
| 98 |
that IPLEN[nprow] is the total number of rows. In other words |
| 99 |
IPLEN[i+1] - IPLEN[i] is the local number of rows of U that |
| 100 |
should be moved to process IPMAP[i]. |
| 101 |
</PRE>
|
| 102 |
<PRE>
|
| 103 |
IPMAP (global input) const int * |
| 104 |
On entry, IPMAP is an array of dimension NPROW. This array |
| 105 |
contains the logarithmic mapping of the processes. In other |
| 106 |
words, IPMAP[myrow] is the absolute coordinate of the sorted |
| 107 |
process. |
| 108 |
</PRE>
|
| 109 |
<PRE>
|
| 110 |
IPMAPM1 (global input) const int * |
| 111 |
On entry, IPMAPM1 is an array of dimension NPROW. This array |
| 112 |
contains the inverse of the logarithmic mapping contained in |
| 113 |
IPMAP: For i in [0.. NPROW) IPMAPM1[IPMAP[i]] = i. |
| 114 |
</PRE>
|
| 115 |
|
| 116 |
<H1>See Also</H1> |
| 117 |
<A HREF="HPL_pdlaswp01N.html">HPL_pdlaswp01N</A>. |
| 118 |
|
| 119 |
</BODY>
|
| 120 |
</HTML>
|