vmstat, iostat, top…etc are useful to check server load, I\/O or memory usage.<\/p>\n
iostat
\nr\/s and w\/s
\nthe number of read and write requests sent to the device per second
\nawait
\nthe number of requests waiting in the device’s queue
\nsvctm
\nthe number of miliseconds spent servicing requests, from beginning to end
\nutil
\nthe percentage of the device utilization<\/p>\n
vmstat
\nprocs
\nr: processes are waiting for the CPU time
\nb: processes are in sleep (means they are waiting for I\/O)
\nio
\nbi\/bo: how many blocks reading in\/out the device
\nsystem
\nin: number of interrupts per second
\ncs: context switches per second<\/p>\n
Here are some good sites showing how to use them<\/p>\n
http:\/\/www.cyberciti.biz\/tips\/linux-disk-performance-monitoring-howto.html
\nhttp:\/\/www.cyberciti.biz\/tips\/how-do-i-find-out-linux-cpu-utilization.html
\nhttp:\/\/www.linuxforums.org\/articles\/using-top-more-efficiently_89.html
\nhttp:\/\/software.intel.com\/en-us\/blogs\/2011\/02\/09\/using-linux-top-to-troubleshoot-multi-core-scalability-issues-at-dreamworks-animation\/<\/p>\n
Good article about I\/O scheduler
\nhttp:\/\/www.linuxjournal.com\/article\/6931<\/p>\n","protected":false},"excerpt":{"rendered":"
vmstat, iostat, top…etc are useful to check server load, I\/O or memory usage. iostat r\/s and w\/s the number of read and write requests sent to the device per second await the number of requests waiting in the device’s queue … Continue reading