79 lines
4.9 KiB
HTML
79 lines
4.9 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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<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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<!-- 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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<title>Communications performance considerations for interactive jobs</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-cominterjobsin"></a>
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<h4 id="rzajtper-cominterjobsin">Communications performance considerations for interactive jobs</h4>
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<p>An interactive job is one that uses a keyboard and character-type display.
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If a job needs the user to type on the keyboard and display character results,
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that job is probably considered interactive. Interactive in this sense means
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that the job and the user depend on each other to get the work done.</p>
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<p>To optimize communications performance for interactive jobs, consider the
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following:</p>
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<ul>
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<li>Attach workstations through communications. This requires more CPU overhead
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than 5250 local workstations.</li>
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<li>Use a twinaxial controller to provide better performance than an American
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National Standard Code for Information Interchange (ASCII) controller.</li>
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<li>Keep the line utilization below 30 percent for best performance when interactive
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users are attached. This maintains predictable and consistent response times.
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Exceeding 50 to 60 percent line utilization will typically cause unacceptable
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response times.</li></ul>
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<p>If your system has interactive users who are connected many different ways,
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you should consider configuring your interactive subsystems to separate the
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users. Local workstation, remote workstations, 5250 display station pass-through,
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or Telnet are some examples of these types of connections that should be separated.
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When you configure interactive subsystems, identify how you want the interactive
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users to be separated and create the appropriate subsystem descriptions.</p>
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<p>During error recovery, when many users risk losing their sessions at one
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time, an interactive subsystem can be very busy performing device recovery.
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This device recovery can adversely affect the work of other users in the subsystem
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who would otherwise be unaffected by the failure. Therefore, you might need
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to change how the interactive subsystems are configured. However, multiple
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subsystems can provide multiple processes to do cleanup and recovery when
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error conditions occur. This can result in improved performance.</p>
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<p>The example below shows how to configure an interactive subsystem to allocate
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devices that begin with devname* and present a signon display on those display
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devices: </p>
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<pre class="xmp">ADDWSE SBSD(libname/sbsname) WRKSTNDEV(devname*) AT(*SIGNON)
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</pre>
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<p>Use the following example to configure an interactive subsystem so that
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the device name devname* is not allocated and a signon display does not appear.</p>
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<pre class="xmp">ADDWSE SBSD(libname/sbsname) WRKSTNDEV(devname*) AT(*ENTER)
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</pre>
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<p>Adding workstation entries with AT(*ENTER) allows you to use the Transfer
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Job (TFRJOB) function into that subsystem. If the TFRJOB function is not required
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or necessary, there is no need to add the workstation entries with AT(*ENTER).</p>
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<p>To specify the devices an interactive subsystem<span class="bold"> should</span> allocate when the subsystem is started:</p>
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<pre class="xmp">ADDWSE SBSD(libname/sbsname) WRKSTN(devname*) AT(*SIGNON)</pre>
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<p>To specify the devices an interactive subsystem <span class="bold">should
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not</span> allocate when the subsystem is started:</p>
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<pre class="xmp">ADDWSE SBSD(libname/sbsname) WRKSTN(devname*) AT(*ENTER)</pre>
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<ul>
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<li>See the following <a href="rzajtrzajterrexm2.htm#rzajterr-exm2">example</a> for a way of
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configuring your interactive subsystem.</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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