1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
|
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<!--Converted with LaTeX2HTML 96.1-h (September 30, 1996) by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds -->
<HTML>
<HEAD>
<TITLE>Array Descriptors</TITLE>
<META NAME="description" CONTENT="Array Descriptors">
<META NAME="keywords" CONTENT="slug">
<META NAME="resource-type" CONTENT="document">
<META NAME="distribution" CONTENT="global">
<LINK REL=STYLESHEET HREF="slug.css">
</HEAD>
<BODY LANG="EN" >
<A NAME="tex2html3092" HREF="node74.html"><IMG WIDTH=37 HEIGHT=24 ALIGN=BOTTOM ALT="next" SRC="http://www.netlib.org/utk/icons/next_motif.gif"></A> <A NAME="tex2html3090" HREF="node68.html"><IMG WIDTH=26 HEIGHT=24 ALIGN=BOTTOM ALT="up" SRC="http://www.netlib.org/utk/icons/up_motif.gif"></A> <A NAME="tex2html3084" HREF="node72.html"><IMG WIDTH=63 HEIGHT=24 ALIGN=BOTTOM ALT="previous" SRC="http://www.netlib.org/utk/icons/previous_motif.gif"></A> <A NAME="tex2html3094" HREF="node1.html"><IMG WIDTH=65 HEIGHT=24 ALIGN=BOTTOM ALT="contents" SRC="http://www.netlib.org/utk/icons/contents_motif.gif"></A> <A NAME="tex2html3095" HREF="node190.html"><IMG WIDTH=43 HEIGHT=24 ALIGN=BOTTOM ALT="index" SRC="http://www.netlib.org/utk/icons/index_motif.gif"></A> <BR>
<B> Next:</B> <A NAME="tex2html3093" HREF="node74.html">In-core Dense Matrices</A>
<B>Up:</B> <A NAME="tex2html3091" HREF="node68.html">Data Distributions and Software </A>
<B> Previous:</B> <A NAME="tex2html3085" HREF="node72.html">Scoped Operations</A>
<BR> <P>
<H1><A NAME="SECTION04420000000000000000">Array Descriptors</A></H1>
<A NAME="secdescriptors"> </A>
<A NAME="2331"> </A>
<P>
An <B>array descriptor</B><A NAME="2333"> </A><A NAME="2334"> </A><A NAME="2335"> </A> is associated with each
global array. This array stores the
information required to establish the
mapping between each global array entry
and its corresponding process and memory
location. The notations x_ used in the
entries of the array descriptor denote
the attributes of a global array. For
example, M_ denotes the number of rows
and M_A specifically denotes the number
of rows in global matrix A. These
descriptors assume different storage
for the global data. The length of
the array descriptor<A NAME="2336"> </A>
is specified by DLEN_ and varies
according to the descriptor type DTYPE_.
<P>
Array descriptors are provided for
<UL>
<LI> dense matrices,
<LI> band and tridiagonal matrices, and
<LI> out-of-core matrices
</UL>
and are differentiated by the DTYPE_
entry in the descriptor. At the present
time the following values of DESC_(DTYPE_)
are valid. <A NAME="2339"> </A>
<P><A NAME="2341"> </A><IMG WIDTH=603 HEIGHT=110 ALIGN=BOTTOM ALT="table2340" SRC="img254.gif"><BR>
<STRONG>Table 4.2:</STRONG> Valid values of DESC_(DTYPE_)<BR>
<P><BR> <HR>
<P><ADDRESS>
<I>Susan Blackford <BR>
Tue May 13 09:21:01 EDT 1997</I>
</ADDRESS>
</BODY>
</HTML>
|
