1HPL_rollT(3)                 HPL Library Functions                HPL_rollT(3)
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NAME

6       HPL_rollT - Roll U and forward the column panel.
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SYNOPSIS

9       #include "hpl.h"
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11       void  HPL_rollT( HPL_T_panel * PBCST, int * IFLAG, HPL_T_panel * PANEL,
12       const int N, double * U, const int LDU, const int * IPLEN, const int  *
13       IPMAP, const int * IPMAPM1 );
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DESCRIPTION

16       HPL_rollT  rolls  the local arrays containing the local pieces of U, so
17       that on exit to this function  U  is replicated in every  process  row.
18       In  addition,  this function probe for the presence of the column panel
19       and forwards it when available.
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ARGUMENTS

22       PBCST   (local input/output)    HPL_T_panel *
23               On entry,  PBCST  points to the data structure  containing  the
24               panel (to be broadcast) information.
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26       IFLAG   (local input/output)    int *
27               On  entry,  IFLAG  indicates  whether or not  the broadcast has
28               already been completed.  If not,  probing will occur,  and  the
29               outcome will be contained in IFLAG on exit.
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31       PANEL   (local input/output)    HPL_T_panel *
32               On  entry,   PANEL  points to the data structure containing the
33               panel (to be rolled) information.
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35       N       (local input)           const int
36               On entry, N specifies the local number of rows of  U.   N  must
37               be at least zero.
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39       U       (local input/output)    double *
40               On  entry,   U  is an array of dimension (LDU,*) containing the
41               local pieces of U in each process row.
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43       LDU     (local input)           const int
44               On entry, LDU specifies the local leading dimension of  U.  LDU
45               should be at least  MAX(1,N).
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47       IPLEN   (global input)          const int *
48               On  entry,  IPLEN is an array of dimension NPROW+1.  This array
49               is such that IPLEN[i+1] - IPLEN[i] is the number of rows  of  U
50               in each process row.
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52       IPMAP   (global input)          const int *
53               On  entry,  IMAP  is an array of dimension  NPROW.  This  array
54               contains  the  logarithmic mapping of the processes.  In  other
55               words,   IMAP[myrow]   is the absolute coordinate of the sorted
56               process.
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58       IPMAPM1 (global input)          const int *
59               On entry,  IMAPM1  is an array of dimension NPROW.  This  array
60               contains   the  inverse of the logarithmic mapping contained in
61               IMAP: For i in [0.. NPROW) IMAPM1[IMAP[i]] = i.
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SEE ALSO

64       HPL_pdlaswp01T (3).
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68HPL 2.1                        October 26, 2012                   HPL_rollT(3)
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