High load
Revision as of 15:49, 12 July 2016 by Freephile (talk | contribs) (added Category:System Administration using HotCat)
This is an article in the Performance tuning series.
You usually get asked to figure out why load is high on a system that lacks any sort of systematic baseline graphs and statistics like you would have with a professionally managed environment. If you're looking to install performance monitoring systems proactively, we'll cover that separately in articles like wp:Munin (software). In Linux Journal, Kyle Rankin introduces some methods for diagnosing High Load problems on your linux server. He goes through typical usage of commands like top
and iotop
.
General[edit | edit source]
Some of the commands you will find useful for high load issues
# look at any hardware or unusual issues first
dmesg
# look at the partitions you have
mount
# see total stats for the machine
uptime
# look at processes sorted by virtual size
ps awwlx --sort=vsz
# get three cycles of info from iostat
iostat -d -x 5 3
# show one iteration of iotop
iotop -bto --iter=1
Applications[edit | edit source]
Troubleshooting High Load issues by configuring specific services or applications
See