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| 2 | 1 | equemene | <HEAD>
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| 3 | 1 | equemene | <TITLE>HPL_reduce HPL 2.0 Library Functions September 10, 2008</TITLE> |
| 4 | 1 | equemene | </HEAD>
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| 5 | 1 | equemene | |
| 6 | 1 | equemene | <BODY BGCOLOR="WHITE" TEXT = "#000000" LINK = "#0000ff" VLINK = "#000099" |
| 7 | 1 | equemene | ALINK = "#ffff00"> |
| 8 | 1 | equemene | |
| 9 | 1 | equemene | <H1>Name</H1> |
| 10 | 1 | equemene | <B>HPL_reduce</B> Reduce operation. |
| 11 | 1 | equemene | |
| 12 | 1 | equemene | <H1>Synopsis</H1> |
| 13 | 1 | equemene | <CODE>#include "hpl.h"</CODE><BR><BR> |
| 14 | 1 | equemene | <CODE>int</CODE> |
| 15 | 1 | equemene | <CODE>HPL_reduce(</CODE> |
| 16 | 1 | equemene | <CODE>void *</CODE> |
| 17 | 1 | equemene | <CODE>BUFFER</CODE>, |
| 18 | 1 | equemene | <CODE>const int</CODE> |
| 19 | 1 | equemene | <CODE>COUNT</CODE>, |
| 20 | 1 | equemene | <CODE>const HPL_T_TYPE</CODE> |
| 21 | 1 | equemene | <CODE>DTYPE</CODE>, |
| 22 | 1 | equemene | <CODE>const HPL_T_OP </CODE> |
| 23 | 1 | equemene | <CODE>OP</CODE>, |
| 24 | 1 | equemene | <CODE>const int</CODE> |
| 25 | 1 | equemene | <CODE>ROOT</CODE>, |
| 26 | 1 | equemene | <CODE>MPI_Comm</CODE> |
| 27 | 1 | equemene | <CODE>COMM</CODE> |
| 28 | 1 | equemene | <CODE>);</CODE> |
| 29 | 1 | equemene | |
| 30 | 1 | equemene | <H1>Description</H1> |
| 31 | 1 | equemene | <B>HPL_reduce</B> |
| 32 | 1 | equemene | performs a global reduce operation across all processes of |
| 33 | 1 | equemene | a group. Note that the input buffer is used as workarray and in all |
| 34 | 1 | equemene | processes but the accumulating process corrupting the original data. |
| 35 | 1 | equemene | |
| 36 | 1 | equemene | <H1>Arguments</H1> |
| 37 | 1 | equemene | <PRE>
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| 38 | 1 | equemene | BUFFER (local input/output) void * |
| 39 | 1 | equemene | On entry, BUFFER points to the buffer to be reduced. On |
| 40 | 1 | equemene | exit, and in process of rank ROOT this array contains the |
| 41 | 1 | equemene | reduced data. This buffer is also used as workspace during |
| 42 | 1 | equemene | the operation in the other processes of the group. |
| 43 | 1 | equemene | </PRE>
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| 44 | 1 | equemene | <PRE>
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| 45 | 1 | equemene | COUNT (global input) const int |
| 46 | 1 | equemene | On entry, COUNT indicates the number of entries in BUFFER. |
| 47 | 1 | equemene | COUNT must be at least zero. |
| 48 | 1 | equemene | </PRE>
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| 49 | 1 | equemene | <PRE>
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| 50 | 1 | equemene | DTYPE (global input) const HPL_T_TYPE |
| 51 | 1 | equemene | On entry, DTYPE specifies the type of the buffers operands. |
| 52 | 1 | equemene | </PRE>
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| 53 | 1 | equemene | <PRE>
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| 54 | 1 | equemene | OP (global input) const HPL_T_OP |
| 55 | 1 | equemene | On entry, OP is a pointer to the local combine function. |
| 56 | 1 | equemene | </PRE>
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| 57 | 1 | equemene | <PRE>
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| 58 | 1 | equemene | ROOT (global input) const int |
| 59 | 1 | equemene | On entry, ROOT is the coordinate of the accumulating process. |
| 60 | 1 | equemene | </PRE>
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| 61 | 1 | equemene | <PRE>
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| 62 | 1 | equemene | COMM (global/local input) MPI_Comm |
| 63 | 1 | equemene | The MPI communicator identifying the process collection. |
| 64 | 1 | equemene | </PRE>
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| 65 | 1 | equemene | |
| 66 | 1 | equemene | <H1>See Also</H1> |
| 67 | 1 | equemene | <A HREF="HPL_broadcast.html">HPL_broadcast</A>, |
| 68 | 1 | equemene | <A HREF="HPL_all_reduce.html">HPL_all_reduce</A>, |
| 69 | 1 | equemene | <A HREF="HPL_barrier.html">HPL_barrier</A>, |
| 70 | 1 | equemene | <A HREF="HPL_min.html">HPL_min</A>, |
| 71 | 1 | equemene | <A HREF="HPL_max.html">HPL_max</A>, |
| 72 | 1 | equemene | <A HREF="HPL_sum.html">HPL_sum</A>. |
| 73 | 1 | equemene | |
| 74 | 1 | equemene | </BODY>
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| 75 | 1 | equemene | </HTML> |