59 lines
3.6 KiB
HTML
59 lines
3.6 KiB
HTML
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<?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>Application programming interface (API) performance considerations</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="rzajtperappc-in"></a>
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<h3 id="rzajtperappc-in">Application programming interface (API) performance considerations</h3>
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<p>To achieve better performance with your iSeries™ server, you need to consider the application
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programming interface (API) available on the iSeries server. To optimize APPC performance,
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consider the following:</p>
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<ul>
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<li>Using larger sends (record sizes) for a large transfer provides a higher
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application data rate and decreases CPU time. With the larger record size,
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the CPU has less processing to do because there are fewer application reads
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and writes to transfer the same amount of data.</li>
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<li>If a value of *CALC is selected for maximum Systems Network Architecture
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(SNA) request/response unit (RU), the system selects an efficient size compatible
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with the frame size. The frame size is on the line description that you choose.
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Changing the RU size to a value other than *CALC may negate this performance
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feature.</li>
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<li>Compression with APPC should be used with caution and only for slower
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speed wide area network (WAN) environments. Many suggest that compression
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should be used with speeds 19.2 kbps and slower.</li>
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<li>If you are doing tasks that include repetitive, small puts; better performance
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is achieved if you use ICF or CPI Communications.</li></ul>
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<p>See the following topics for a more complete discussion of APPC applications:</p>
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<ul>
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<li><a href="rzajtrzajtpericfpi.htm#rzajtper-icfpi">Performance considerations for Intersystem
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Communications Function</a></li>
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<li><a href="rzajtrzajtpercpicpi.htm#rzajtper-cpicpi">Performance considerations for Common Programming
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Interface communications</a></li></ul>
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<p>For information about iSeries server communications, see the <a href="../books/c4154010.pdf" target="_blank">Communications Configuration</a>
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<img src="wbpdf.gif" alt="Link outside Information Center" /> book.</p>
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<p>For more information about CICS/400®, see the <a href="../books/sc415455.pdf" target="_blank">CICS® for iSeries Administration and Operations Guide</a>
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<img src="wbpdf.gif" alt="Link to PDF" />.</p>
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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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