<html> <head> <link rel=stylesheet href="style.css" type="text/css"> <title>Hello World</title> </head> <body> <center><h1>Hello World</h1></center> <p> <h3>Introduction</h3> <p> Included with collectl is the example file <i>hello.ph</i> which is a collectlized version of hello world. It simulates a <i>hw</i> subsystem consisting of 3 hw instances, which in turn report a single counter. Here is an example of its simulated /proc data, which is shown by using -d4. Also notice in this case the discriminator is <i>hw</i> but <i>-n</i> is also included in the calls to <i>record()</i> to further identify individual devices: <div class=terminal> <pre> collectl --imp hello -d4 >>> 1238167880.003 <<< hw-0 HelloWorld 0 hw-1 HelloWorld 10 hw-2 HelloWorld 40 </pre></div> You can use this example module with virtually any combinations of switches and any other collectl subsystems as well as exporting the output over a socket, writing to a raw file or playing it back. As you should realize by now the combinations are far too extensive to list so below is only the simplest one, showing this data combined with cpu stats in brief format with timestamps in msecs. <div class=terminal> <pre> collectl --imp hello -sc -oTm # <--------CPU--------><-Hello-> #Time cpu sys inter ctxsw Total 11:40:29.002 0 0 1027 126 140 11:40:30.002 0 0 1012 138 230 </pre></div> For further information on using this capability see hello.ph which has been heavily annotated and should make a good staring template for developing your own custom modules. <table width=100%><tr><td align=right><i>updated Feb 21, 2011</i></td></tr></colgroup></table> </body> </html>
