<html> <head> <link rel=stylesheet href="style.css" type="text/css"> <title>Importing Miscellaneous Data</title> </head> <body> <center><h1>Importing Miscellaneous Data</h1></center> <p> This module reports on several variables that are not collectled as part of collectl's core metrics, partly because some of them don't exactly fit into collectl's main stats, but some users still find useful. There are also a few instructive techniques used in this simple module that are worth calling out: <ul> <li>use of its own routine grepProc() to find a specific entry in /proc and return either the first instance or the count of instances, noting that using the real <i>grep</i> has far too much overhead due to the grep process start-up and tear-down</li> <li>support for a different monitoring interval yet still displays, exports and logs the data every cycle</li> <li>ability to pass additional parameters with values, in this case the interval</li> <li>use of getExec() for running another process to get the number of logged in users, noting this is slower than getProc() and the command being used is slow enough that a different monitoring interval is needed to avoid excess overhead.</li> </ul> <p> The following example shows one importing both hello.ph and misc.ph while displaying cpu data and running all at the same interval: <div class=terminal> <pre> [root@cag-dl585-02 collectl]# collectl -sc --import hello:misc #<--------CPU--------><-Hello-><------CMU Extras-----> #cpu sys inter ctxsw Total UTim MHz MT Huge Log 0 0 1034 149 140 94 2197 1 0 4 0 0 1010 138 230 94 2197 1 0 4 </pre></div> In this example we're just doing the 2 imports, setting the misc monitoring interval to 2 and exporting the data with lexpr. As you can see, the hello data is reported every interval but the misc data only every other one: <div class=terminal> <pre> [root@cag-dl585-02 collectl]# collectl --import hello:misc,i=2 --export lexpr sample.time 1239625280.001 hwtotals.val 140 misc.uptime 93 misc.cpuMHz 2197 misc.mounts 1 misc.logins 4 sample.time 1239625281.001 hwtotals.val 230 sample.time 1239625282.002 hwtotals.val 319 misc.uptime 93 misc.cpuMHz 2197 misc.mounts 1 misc.logins 4 sample.time 1239625283.002 hwtotals.val 410 sample.time 1239625284.002 hwtotals.val 500 misc.uptime 93 misc.cpuMHz 2197 misc.mounts 1 misc.logins 4 sample.time 1239625285.002 hwtotals.val 590 </pre></div> <table width=100%><tr><td align=right><i>updated Feb 21, 2011</i></td></tr></colgroup></table> </body> </html>
