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<TITLE>HPL_spreadT HPL 2.0 Library Functions September 10, 2008</TITLE> |
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ALINK = "#ffff00"> |
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<H1>Name</H1> |
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<B>HPL_spreadT</B> Spread row panel U and forward current column panel. |
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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_spreadT(</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_SIDE</CODE> |
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<CODE>SIDE</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>const int</CODE> |
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<CODE>SRCDIST</CODE>, |
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<CODE>const 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>);</CODE> |
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<H1>Description</H1> |
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<B>HPL_spreadT</B> |
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spreads the local array containing local pieces of U, so |
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that on exit to this function, a piece of U is contained in every |
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process row. The array IPLEN contains the number of columns of U, |
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that should be spread on any given process row. This function also |
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probes for the presence of the column panel PBCST. If available, |
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this panel will be forwarded. If PBCST is NULL on input, this |
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probing mechanism will be disabled. |
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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 spread) information. |
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</PRE>
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<PRE>
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SIDE (global input) const enum HPL_SIDE |
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On entry, SIDE specifies whether the local piece of U located |
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in process IPMAP[SRCDIST] should be spread to the right or to |
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the left. This feature is used by the equilibration process. |
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</PRE>
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<PRE>
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N (global input) const int |
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On entry, N specifies the local number of rows of U. N must |
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be at least zero. |
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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. |
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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,N). |
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</PRE>
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<PRE>
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SRCDIST (local input) const int |
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On entry, SRCDIST specifies the source process that spreads |
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its piece of U. |
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</PRE>
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<PRE>
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IPLEN (global input) const 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 each process before process IPMAP[i], with the convention |
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that IPLEN[nprow] is the total number of rows. In other words |
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IPLEN[i+1] - IPLEN[i] is the local number of rows of U that |
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should be moved to 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.. NPROW) IPMAPM1[IPMAP[i]] = i. |
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</PRE>
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<H1>See Also</H1> |
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<A HREF="HPL_pdlaswp01T.html">HPL_pdlaswp01T</A>. |
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