{"id":1321,"date":"2005-11-19T17:10:55","date_gmt":"2005-11-20T00:10:55","guid":{"rendered":"http:\/\/www.andreaswacker.com\/blog\/2005\/11\/19\/sar-under-os-x-1043\/"},"modified":"2005-11-19T17:10:55","modified_gmt":"2005-11-20T00:10:55","slug":"sar-under-os-x-1043","status":"publish","type":"post","link":"https:\/\/www.andreaswacker.com\/blog\/2005\/11\/19\/sar-under-os-x-1043\/","title":{"rendered":"sar under OS X 10.4.3"},"content":{"rendered":"

what a weird hack! OS X comes with the sar command, which I found to be very helpful to look at what a machine is doing.
\nJust running
\nsar<\/code><\/p>\n

Will look for todays performance. You have to collect it first. Traditionally this gets done via a cron job. OS X really likes to use launchd <\/a> instead. But I need to get some work done, I don’t have the time to learn another propriatary solution for a very common problem: Running things periodically. So I stick with cron. Not sure why it is running on some of the systems and not on others. If you follow this make sure cron shows up in a ps ax | grep cron<\/code> command. If it does then you could enable daily performance traces reportable by “sar” by adding
\n
\n# run system activity accounting tool every 10 minutes
\n*\/10 * * * * root \/usr\/lib\/sa\/sa1 1 1
\n# generate a daily summary of process accounting at 23:53
\n53 23 * * * root \/usr\/lib\/sa\/sa2 -A
\n<\/code>
\nto \/etc\/crontab<\/code>. If cron runs then it will reread the file automatically. The remaining problem for me and under
\nOS X 10.4.3 was that sa1 overwrote instead of appended the performance data. A really terrible hack that fixed this was to change the lines in \/usr\/lib\/sa\/sa1<\/code> from
\n
\n exec ${ENDIR}\/sadc 1 1 ${DFILE}
\n<\/code>
\nto
\n
\n exec ${ENDIR}\/sadc 1 1 >>${DFILE}
\n<\/code><\/p>\n

This works, but generates error messages like:
\n
\nsar: drivepath sync code error -4
\n<\/code>
\nwhen I retrieve the daily performance data.<\/p>\n

This is good enough for me. All I am after is to find out what that 30TB Xsan has been doing.<\/p>\n","protected":false},"excerpt":{"rendered":"

what a weird hack! OS X comes with the sar command, which I found to be very helpful to look at what a machine is doing. Just running sar Will look for todays performance. You have to collect it first. Traditionally this gets done via a cron job. OS X really likes to use launchd […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[],"yoast_head":"\nsar under OS X 10.4.3 - Andreas Wacker<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.andreaswacker.com\/blog\/2005\/11\/19\/sar-under-os-x-1043\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"sar under OS X 10.4.3 - Andreas Wacker\" \/>\n<meta property=\"og:description\" content=\"what a weird hack! OS X comes with the sar command, which I found to be very helpful to look at what a machine is doing. Just running sar Will look for todays performance. You have to collect it first. 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