On Fri, Feb 15, 2013 at 11:26 AM, Josh Berkus <josh@agliodbs.com> wrote: > On 02/14/2013 08:47 PM, Scott Marlowe wrote: >> If you run your benchmarks for more than a few minutes I highly >> recommend enabling sysstat service data collection, then you can look >> at it after the fact with sar. VERY useful stuff both for >> benchmarking and post mortem on live servers. > > Well, background sar, by default on Linux, only collects every 30min. > For a benchmark run, you want to generate your own sar file, for example:
On all my machines (debian and ubuntu) it collects every 5.
All of mine were 10, but once I figured out to edit /etc/cron.d/sysstat they are now every 1 minute.
sar has some remarkably opaque documentation, but I'm glad I tracked that down.
