93 lines
6.3 KiB
HTML
93 lines
6.3 KiB
HTML
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<meta name="DC.Title" content="QZRCSRVS jobs and their impact on performance" />
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<body id="rzaihwhymonitorimpacts"><a name="rzaihwhymonitorimpacts"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">QZRCSRVS jobs and their impact on performance</h1>
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<div><p>Job monitors connect to a QZRCSRVS job for each job that is being
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monitored for the Job Log Messages and the Job Status metrics. The more jobs
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that are being monitored for these metrics, the more QZRCSRVS jobs are used.</p>
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<p>QZRCSRVS jobs are not Management Central jobs. They are i5/OS™ TCP Remote
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Command Server jobs that the Management Central Java™ server uses for calling commands and
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APIs. In order to process the API calls for the Job Log Messages and Job Status
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metrics in a timely fashion within the job monitor's interval length, the
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APIs are called for each job concurrently at interval time.</p>
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<p>When both metrics are specified on the same monitor, two QZRCSRVS jobs
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are started for each job. For example, if 5 jobs are monitored for Job Log
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Messages, 5 QZRCSRVS jobs are started to support the monitor. If 5 jobs are
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monitored for Job Log Messages and Job Status, then 10 QZRCSRVS jobs are started.</p>
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<p>Thus, it is recommended that for standard systems, when you are using the
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Job Log Message and Job Status metrics, you limit the number of jobs monitored
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on a small system to 40 jobs or less. (With larger systems more jobs may be
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monitored. However, you should have a clear understanding of the resources
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that are used when monitoring more jobs and determine the affordable number
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to monitor. ) Also, severely limit using these two metrics for monitoring
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subsystems, as doing so can cause a large number of QZRCSRVS jobs to run.
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(A job monitor that uses just the other metrics and does not use Job Status
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or Job Log Message, does not use QZRCSRVS jobs.)</p>
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<div class="section"><h4 class="sectiontitle">Tuning QZRCSRVS jobs</h4><p> For jobs that pass work to
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the QZRCSRVS jobs, the subsystem that is specified on the QWTPCPUT API determines
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where the QZRCSRVS jobs run. QWTPCPUT is called during the processing of the
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QYSMPUT API. This API retrieves the subsystem information from the QUSRSYS/QYSMSVRE
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*USRIDX object and uses it on the QWTPCPUT call. As shipped, QZRCSRVS jobs
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are prestart jobs that run in the QUSRWRK subsystem and this is where the
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connections are routed. </p>
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<p>If you end the prestart jobs in QUSRWRK with
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the ENDPJ command, then the QZRCSRVS jobs start as batch-immediate jobs in
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the QSYSWRK subsystem whenever a connection is requested. No jobs start in
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advance of the connection. </p>
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<p>You can configure your system so that prestart
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jobs can be run from any subsystem. You can also configure your system to
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prevent batch-immediate jobs from being used at all. If the Job Monitor server
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jobs are calling Java Toolbox functions to pass work to QZRCSRVS, then
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they are using the QYSMPUT API, and the work should run in whichever subsystem
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is stored in the user index. </p>
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</div>
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<div class="section"><h4 class="sectiontitle">QZRCSRVS cleanup</h4><p>A cleanup thread runs once an hour
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to determine whether a QZRCSRVS job is still being used by a Job Monitor.
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It determines if the job was used at least twice within the maximum job monitor
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interval length. If the job is not used during the previous two hours, it
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is ended. Java time stamps are used for this comparison, so it
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is imperative that the time zone value used by Java is correct (system value
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QTIMZON).</p>
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<div class="p">QZRCSRVS jobs are automatically removed two hours
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after the job it supports ends. Likewise QZRCSRVS jobs will end if the Job
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Monitor that created them stops, or if Management Central ends.<div class="note"><span class="notetitle">Note:</span> Since
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the Management Central Job Monitor monitors active jobs, you might see messages
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like "Internal job identifier no longer valid" in the QZRCSRVS job. This normally
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happens when a monitored job with Job Log Messages or the Job Status metric
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ends while the monitor is running. </div>
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</div>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzaihcolsvsmonrelshp.htm" title="In order to avoid creating a negative performance impact on your system, you should understand how the different metrics in the job monitor uses Collection Services.">Job monitors and Collection Services</a></div>
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