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Full Discussion: Sar during a test
Top Forums UNIX for Advanced & Expert Users Sar during a test Post 302909071 by rbatte1 on Monday 14th of July 2014 08:34:03 AM
Old 07-14-2014
If your process runs for a couple of hours, then the sample interval should reflect this, else you will end up with too much details to make a good judgement from.

If you ask it to sample at 30 seconds for 120 repetitions, you will get an hour's data. I suppose you can graph (with Excel or similar) the data:-
Code:
sar 30 120 > /tmp/my_sar_output

You will need to consider what options to set for whatever you want to measure.

If you bring the sampling down to a single second, or even two seconds then there is a risk that the sar processing will skew your results, a bit like putting a thermometer in a mug of hot coffee will actually cool it a little and tell you what the temperature has now become, not what it was.



Robin
 

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sadc(8) 						    BSD System Manager's Manual 						   sadc(8)

NAME
sadc -- system activity data collector SYNOPSIS
/usr/lib/sa/sadc [-m mode] [t n] [ofile] DESCRIPTION
The sadc tool is used to collect cumulative system activity data. The sample system data is collected at intervals t seconds apart, in a loop n times. The binary sample data is written to ofile if specified. Otherwise, the binary data is written to stdout. If the ofile file does not exist, it is created, otherwise it is truncated. sadc is intended to be used as the engine behind the sar(1) command, and is not typically invoked on the command line. Two shell scripts, sa1 and sa2 are provided to drive the typical sampling, saving, and reporting process. OPTIONS
The following options modify the way data is collected by sadc. -m mode Modify the collection of system statistics as specified by mode. Currently only one mode is supported. PPP By default, the collection of ppp network interface statistics is turned off. This is because the number of ppp connec- tions can be very high, causing the raw data file to grow unexpectedly large, especially when samples are collected at short intervals. Use the PPP mode to turn the collection back on. EXAMPLES
/usr/lib/sa/sadc 15 20 /tmp/sample.out This call collects 20 samples at 15 second intervals. The binary data is written to the /tmp/sample.out file FILES
/var/log/sa/sadd Default daily activity file that holds the binary sampling data. dd are digits that represent the day of the month. /usr/lib/sa/sa1 Shell script used to drive the sar data collection. /usr/lib/sa/sa2 Shell script used to drive the sar data reporting. SEE ALSO
sa1(8), sa2(8), sar(1), iostat(8), vm_stat(1), netstat(1), top(1), sc_usage(1), fs_usage(1) Mac OS X Jul 25 2003 Mac OS X
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