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- RT @teknoids: Teknoids Post: smart boards in law schools? https://t.co/XmqLD2EycX 12:30:56, 2015-12-01
- RT @pressbooks: Pressbooks is part of this coalition that seeks to annotate knowledge across the Web: https://t.co/vMGEIDgdrU 12:32:01, 2015-12-01
- My Twitter Digest for 11/30/2015 https://t.co/g4lO2tvRBG 15:30:53, 2015-12-01
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- RT @jasonnazar: 1 / Sad day. @IntuitInc shut down @docstoc today. We had over 1 Billion people visit the site since 2007 https://t.co/HhS… 16:18:32, 2015-12-01
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Netflix shows how they get a high level look at Linux in 60 seconds
In 60 seconds you can get a high level idea of system resource usage and running processes by running the following ten commands. Look for errors and saturation metrics, as they are both easy to interpret, and then resource utilization. Saturation is where a resource has more load than it can handle, and can be exposed either as the length of a request queue, or time spent waiting.
uptime
dmesg | tail
vmstat 1
mpstat -P ALL 1
pidstat 1
iostat -xz 1
free -m
sar -n DEV 1
sar -n TCP,ETCP 1
topSome of these
commands
require the sysstat package installed. The metrics these commands expose will help you complete some of the USE Method: a methodology for locating performance bottlenecks. This involves checking utilization, saturation, and error metrics for all resources (CPUs, memory, disks, e.t.c.). Also pay attention to when you have checked and exonerated a resource, as by process of elimination this narrows the targets to study, and directs any follow on investigation.
The Netflix Tech Blog: Linux Performance Analysis in 60,000 Milliseconds http://techblog.netflix.com/2015/11/linux-performance-analysis-in-60s.html
Lots of good info here, though I suspect many sys admins already run through most of this once they land on a box.