66 lines
3.8 KiB
HTML
66 lines
3.8 KiB
HTML
<?xml version="1.0" encoding="utf-8"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" lang="en-US" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="dc.language" scheme="rfc1766" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<meta name="dc.date" scheme="iso8601" content="2005-09-06" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="security" content="public" />
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<meta name="Robots" content="index,follow"/>
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<title>Performance considerations for intersystem communications function</title>
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<link rel="stylesheet" type="text/css" href="ibmidwb.css" />
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<link rel="stylesheet" type="text/css" href="ic.css" />
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</head>
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<body>
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<a id="Top_Of_Page" name="Top_Of_Page"></a><!-- Java sync-link -->
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<script language = "Javascript" src = "../rzahg/synch.js" type="text/javascript"></script>
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<a name="rzajtper-icfpi"></a>
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<h4 id="rzajtper-icfpi">Performance considerations for intersystem communications function</h4>
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<p>You can use intersystem communications function (ICF) to write application
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programs that you want to communicate with advanced program-to-program communications
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(APPC). ICF also provides program-to-device communications between the iSeries™ system and hardware devices. You must determine which system is to
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send data first before you write the program. ICF data management handles
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the communication functions and the data for your program. In particular,
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ICF should be used to
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do tasks that include repetitive, small inputs.</p>
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<p>To optimize ICF performance, consider the following:</p>
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<ul>
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<li>Eliminate unused record formats.</li>
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<li>Use separate record formats instead of multipurpose record formats with
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option indicators.</li>
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<li>Code to use the same record format for repeated operations.</li>
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<li>Set the maximum program devices equal to 1.</li>
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<li>Use a nonshared file.</li>
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<li>Use a separate indicator area.</li>
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<li>The use of the ICF keywords force data and confirm should be minimized.</li>
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<li>Use the Request to Send keyword only when necessary.</li>
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<li>Use the Invite Only keyword when soliciting input from multiple devices,
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otherwise use the Read keyword instead.</li>
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<li>If using the Invite keyword to solicit from multiple program devices,
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follow it with a Read-from-invited operation, not a Read operation.</li></ul>
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<p>To create device descriptions to get your system set up for ICF, do the
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following:</p>
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<ol type="1">
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<li>Type the appropriate Create Device Description commands on the iSeries system command
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line and press F4.</li>
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<li>Use the online help information to choose the parameter values.</li>
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<li>Press Enter. The device description is created.</li></ol>
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<p>For more information about ICF, see</p>
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<ul>
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<li><a href="rzajtrzajtperappcin.htm#rzajtperappc-in">Application programming interface (API) performance considerations</a></li>
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<li><a href="../books/sc415442.pdf" target="_blank">ICF Programming</a>
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<img src="wbpdf.gif" alt="Link to PDF" /></li></ul>
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<a id="Bot_Of_Page" name="Bot_Of_Page"></a>
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</body>
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</html>
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