defaria.com/blogs/Status/2005/12/pulse.html

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  73                       <li class="asset-meta-list-item">Posted on <time datetime="2005-12-30T10:57:49-08:00" itemprop="datePublished">December 30, 2005</time></li>
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  84                   <ul>
  85   <li>Added some functionality to Clearcase::Vob and Clearcase::View</li>
  86
  87   <li>Coded a pulse script which performs a pulse checking by checking out and in a file 10 times. If the pulse takes more than 60 seconds then an error is reported</li>
  88 </ul>
  89                   <h2>Pulse</h2>
  90
  91 <p>I decided to make the pulse script part of a larger project so I created a perf subdirectory under cc. The idea here is that pulse is a sort of performance test - a "sanity performance test" if you will. In general the script does the following:</p>
  92
  93 <ul>
  94   <li>Creates a logfile (pulse.log)</li>
  95
  96   <li>Creates a new view (default) if required</li>
  97
  98   <li>Sets context to that view</li>
  99
 100   <li>Changes directory to the view to the vob (/vobs/adm by default)</li>
 101
 102   <li>Performs 10 checkouts and checkins of a relatively large file (a copy of firefox.exe which is ~7 Meg)</li>
 103
 104   <li>Compares the time that those checkouts and checkins took against a threshold (default 60) and reports an error if it took too long</li>
 105 </ul>
 106
 107 <p>Here is a usage:</p>
 108
 109 <div class="code"><pre>
 110 ccase-rmna-3:export SITE_PERL_LIBPATH=~/SCM/lib
 111 ccase-rmna-3:pulse -u
 112 Usage:  pulse (v1.0) [-u] [-v] [-d] [-view <viewtag>] [-vob <vobtag>]
 113         [-element <element>] [-t <n>] [-i <n>]
 114
 115 Where:
 116
 117   -u:       Display usage
 118   -v:       Turn on verbose mode
 119   -d:       Turn on debug mode
 120   -view:    View tag to create/use (Default: default)
 121   -vob:     Vob tag to use (Default /vobs/adm)
 122   -element: Vob relative path to element to checkout/in (Default: firefox.exe)
 123   -t <n>:   Threshold of what is "too long" (Default 60 seconds)
 124   -i <n>:   Number of iterations (default 10)
 125 </pre></div>
 126
 127 <p>Here's an example of the log file produced:</p>
 128
 129 <div class="code"><pre>
 130 pulse: 12/30/2005 @ 12:27: Performing 10 checkout/ins in view default vob /vobs/adm of element firefox.exe
 131 pulse: 12/30/2005 @ 12:28: Finished in 36 seconds
 132 pulse: 12/30/2005 @ 12:28: Performing 10 checkout/ins in view default vob /vobs/adm of element firefox.exe
 133 pulse: 12/30/2005 @ 12:29: Finished in 35 seconds
 134 </pre></div>
 135 <p>Several issues came up when attempting to code this script. For example:</p>
 136
 137 <ul>
 138   <li>Which view should this operate in?</li>
 139
 140   <li>Which vob should this operate in?</li>
 141
 142   <li>How will we assure that this vob exists at any site that we want to run pulse? Perhaps we should make a vob for performance testing only (e.g. /vobs/perf).</li>
 143
 144   <li>Checking out and in a single element creates many versions on the version tree. If this pulse script was run every hour then 240 versions would be created in only one day. It would be better to more properly "setup" and "teardown" the whole environment but this would be considerably more complex and time consuming. For example, pulse could create the view, create the vob, formulate some elements and do mkelems on them, do the checkouts and checkins, do rmelems and remove the vob and view, etc. That's a lot! Alternately it could simply do the mkelems, the checkouts and checkins, then do rmelems but that brings up the issue of where does the source come for the mkelems? Also, typically there's a trigger to prevent rmelem...</li>
 145
 146   <li>Currently the script is pretty Unix centric. For example, it uses cleartool lsview -stgloc -auto. This works on Unix but for some reason -stgloc doesn't work on Windows. I also suspect that at the various sites usage of -stgloc might not be that reliable.</li>
 147
 148   <li>Also the view used is a dynamic view. Should a snapshot version be coded?</li>
 149
 150   <li>Current the script uses /vobs/<vobname> for a vob tag. In fact it uses /vobs/adm. This is not a Windows vob tag so the script will not work on Windows</li>
 151
 152   <li>The script does sport paramaters to change things such as the view used, the vob used and the element to checkout and in. The defaults are great but then again we don't have a performance testing environment setup and replicated yet</li>
 153
 154   <li>Currently the script logs it's activity to a log file but it's not in a great format for analysis. The TimeUtils module I'm using only as 1 second resolution. I'm not sure how much analysis of this logfile is desired</li>
 155
 156   <li>There is no facility for emailing alerts when the script determines that things are taking too long</li>
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