49.html

来自「国外MPI教材」· HTML 代码 · 共 43 行

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"><head>	<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />	<style type="text/css">	body { font-family: Verdana, Arial, Helvetica, sans-serif;}	a.at-term {	font-style: italic; }	</style>	<title>Communication Envelope</title>	<meta name="Generator" content="ATutor">	<meta name="Keywords" content=""></head><body> <p>The messages that are passed between processes consist of two groups of information - message content and envelope.</p>

<h3>Message content</h3>

<p>First is the message itself. The message contains the following information:</p>

<ul>
<li>
How many data items are being sent</li>

<li>
What is the MPI datatype</li>
</ul>
<img SRC="envelope2.gif" height=314 width=245>

<h3>Envelope information</h3>

<p>Second and is the envelope information.&nbsp; Just as standard postal mail, the envelope contains a destination address and a return address.</p>

<ul>
<li>
Source address: Rank of the process that called the send function. Automatically
specified by the function call.</li>

<li>
Destination address: Rank of the process that will receive the data.&nbsp; Specified in the send function by the user.</li>
</ul>

<img SRC="envelope1.gif" height=205 width=190></body></html>

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