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<meta name="DC.Title" content="Performance explorer definitions" />
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<title>Performance explorer definitions</title>
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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">Performance explorer definitions</h1>
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<div><p>The parameters and conditions that determine what data performance
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explorer collects and how it collects it are configured and stored using performance
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explorer definitions. This topic explains how to use these definitions and
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provides a sample illustrating a simple definition.</p>
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<p>To collect performance explorer data, you need to tell performance explorer
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what data to gather. You do this by using the <span class="cmdname">Add Performance Explorer
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Definition (ADDPEXDFN)</span> command to create a performance explorer
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definition. After the definition is completed and saved, you are ready to
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continue to the next task in the cycle of work.</p>
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<p>Before creating a new definition, consider what kinds of information you
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want and the amount of detail you need. The performance explorer provides
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the following types of data collection:</p>
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<div class="section"><h4 class="sectiontitle">Statistics type definitions</h4><p>Identifies applications
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and IBM<sup>®</sup> programs
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or modules that consume excessive CPU use or that perform a high number of
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disk I/O operations. Typically, you use the statistical type to identify programs
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that should be investigated further as potential performance bottlenecks.</p>
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<ul><li>Good for first order analysis of <span class="keyword">i5/OS™</span> programs,
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procedures, and MI complex instructions. <ul><li>Gives number of invocations</li>
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<li>Gives both inline and cumulative CPU usage in microseconds</li>
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<li>Gives both inline and cumulative number of synchronous and asynchronous
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I/O</li>
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<li>Gives number of calls made</li>
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</ul>
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</li>
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<li>Works well for short or long runs</li>
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<li>Size of the collected data is fairly small and constant for all runs</li>
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<li>Run time collection overhead of ILE procedures may be a problem due to
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the frequency of calls. Although run time is degraded, the collected statistics
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are still accurate because Performance Explorer removes most of the collection
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overhead from the data.</li>
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<li>Uses combined or separated data areas. The MRGJOB parameter on the ADDPEXDFN
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command specifies whether all program statistics are accumulated in one data
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area, or kept separate (for example, one data area for each job).</li>
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</ul>
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<p>The statistics can be structured in either a hierarchical or flattened
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manner.</p>
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<ul><li>A hierarchical structure organizes the statistics into a call tree form
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in which each node in the tree represents a program procedure run by the job
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or task.</li>
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<li>A flattened structure organizes the statistics into a simple list of programs
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or procedures, each with its own set of statistics.</li>
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</ul>
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<p>Here is an example of a performance explorer statistics definition
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called MYSTATS that will show CPU and disk resource usage on a per program
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or procedure level.</p>
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<pre> ADDPEXDFN DFN(MYSTATS) /* The name of the definition. */
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TYPE(*STATS) /* The type of definition */
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JOB(*ALL) /*All Jobs */
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TASKS(*ALL) /*All tasks */
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DTAORG(*FLAT) /* Do not keep track of who calls who */</pre>
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</div>
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<div class="section"><h4 class="sectiontitle">Profile type definitions</h4><p>Identifies high-level language
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(HLL) programs, <span><img src="./delta.gif" alt="Start of change" />modules, procedures, and statements<img src="./deltaend.gif" alt="End of change" /></span> that
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consume excessive CPU utilization based on source program statement numbers. </p>
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<ul><li>Program profile (specify TYPE(*PROFILE) and PRFTYPE(*PGM) on the ADDPEXDFN
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command) <ul><li>Gives detailed breakdown of where you are spending time within a set of
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programs within a specific job.</li>
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<li>Can summarize the data by program, module, procedure, statement, or instruction.</li>
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<li>Size of collection is fairly small and constant regardless of length of
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run.</li>
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<li>Limit of 16 MI programs means that you should use this as a second order
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analysis tool.</li>
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<li>Can vary overhead by changing sample interval. An interval of 2 milliseconds
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seems a good first choice for benchmarks.</li>
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<li>No restrictions on pane size due to the number of programs specified or
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the size of the programs specified.</li>
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</ul>
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<p>Here is an example of a performance explorer program profile definition
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called PGMPROF that will show usage for a particular procedure.</p>
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<pre> ADDPEXDFN DFN(PGMPROF) /* The name of the definition. */
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TYPE(*PROFILE) /* The type of definition */
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JOB(*ALL) /*All Jobs */
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PGM((MYLIB/MYPGM MYMODULE MYPROCEDURE)) /* The name of the program to monitor. */
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INTERVAL(1) /* 1-millisecond samples will be taken. */</pre>
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</li>
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<li>Job profile (specify the following on the ADDPEXDFN command: TYPE(*PROFILE)
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and PRFTYPE(*JOB)) <ul><li>Gives detailed breakdown of where you are spending time in the set of
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jobs or tasks of the collection.</li>
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<li>Size of collection is relatively small but not constant. The size increases
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as the length of the run increases.</li>
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<li>Can profile all jobs and tasks on the system or can narrow the scope of
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data collected to just a few jobs or tasks of interest.</li>
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<li>Can vary overhead by changing sample interval. An interval of 2 milliseconds
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seems a good first choice for benchmarks.</li>
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</ul>
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<p>Here is an example of a performance explorer job profile definition
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called ALLJOBPROF that will show usage for all your jobs.</p>
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<pre> ADDPEXDFN DFN(ALLJOBPROF) /* The name of the definition. */
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TYPE(*PROFILE) /* The type of definition */
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PRFTYPE(*JOB) /* A job profile type will be monitored. */
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JOB(*ALL) /*All Jobs */
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TASKS(*ALL) /*All tasks */
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INTERVAL(1) /* 1-millisecond samples will be taken. */</pre>
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</li>
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</ul>
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</div>
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<div class="section"><h4 class="sectiontitle">Trace definitions</h4><p>Gathers a historical trace of
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performance activity generated by one or more jobs on the system. The trace
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type gathers specific information about when and in what order events occurred.
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The trace type collects detailed reference information about programs, Licensed
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Internal Code (LIC) tasks, <span class="keyword">i5/OS</span> job,
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and object reference information.</p>
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<ul><li>Some common trace events are: <ul><li>Program and procedure calls and returns</li>
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<li>Storage, for example, allocate and deallocate.</li>
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<li>Disk I/O, for example, read operations and write operations.</li>
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<li>Java™ method,
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for example, entry and exit.</li>
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<li>Java,
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for example, object create and garbage collection.</li>
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<li>Journal, for example, start commit and end commit.</li>
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<li>Synchronization, for example, mutex lock and unlock or semaphore waits.</li>
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<li>Communications, for example, TCP, IP, or UDP.</li>
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</ul>
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</li>
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<li>Longer runs collect more data.</li>
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</ul>
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<p>Here is an example of a performance explorer trace definition called
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DISKTRACE that will show usage for all disk events.</p>
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<pre> ADDPEXDFN DFN(DISKTRACE) /* The name of the definition. */
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TYPE(*TRACE) /* The type of definition */
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JOB(*ALL) /*All Jobs */
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TASKS(*ALL) /*All tasks */
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TRCTYPE(*SLTEVT) /* Only selected individual events and machine instructions
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are included in the trace definition */
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SLTEVT(*YES) /* *SLTEVT allows you to specify individual machine instructions
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and events to be specified in addition to the categories of events
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available with the TRCTYPE parameter. */
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DSKEVT((*ALL)) /* All disk events are to be traced. */</pre>
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<p><img src="./delta.gif" alt="Start of change" />Here
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is an example of a performance explorer trace definition called HEAPEVENTS.<img src="./deltaend.gif" alt="End of change" /></p>
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<img src="./delta.gif" alt="Start of change" /><pre> ADDPEXDFN DFN(HEAPEVENTS) /* The name of the definition. */
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TYPE(*TRACE) /* The type of definition */
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JOB(*ALL) /*All Jobs */
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TASK(*ALL) /*All tasks */
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MAXSTG (100000) /*Maximum storage. Set to 100000 because the default of
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10000 KB is often too small for the large number of heap events that can be
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generated when tracing all jobs and all tasks.*/
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TRCTYPE(*HEAP) /* Selects all heap events from the STGEVT
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(storage events) parameter. */</pre><img src="./deltaend.gif" alt="End of change" />
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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="rzahxpexcon.htm" title="Performance explorer works by collecting detailed information about a specified system process or resource. This topic explains how performance explorer works, and how best to use it.">Performance explorer concepts</a></div>
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</div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="rzahxreportpex.htm" title="After you have collected performance data with a performance explorer session, you can view it by running the included reports or by querying the database files directly.">Performance explorer reports</a></div>
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</div>
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<div class="reltasks"><strong>Related tasks</strong><br />
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<div><a href="rzahxpexcfg.htm" title="To collect detailed trace information, you need to tailor performance explorer to work optimally with the application process from which the trace is being taken.">Configure performance explorer</a></div>
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</div>
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<div class="relref"><strong>Related reference</strong><br />
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<div><a href="../cl/addpexdfn.htm">Add Performance Explorer Definition (ADDPEXDFN) command</a></div>
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</div>
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