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I logged into my EC2 instance on AWS, pull the latest code and started running npm update and noticed my Ubuntu become very, very sluggish. When I run ps aux I got this:

USER         PID   %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
    ubuntu   11573  0.0  0.2  19836  2156 pts/1    Ss   17:15   0:00 -bash
    root     12935  0.0  0.0   4440   556 ?        S     2015   0:00 /bin/sh /var/awslogs/bin/awslogs-agent-launcher.sh
    root     12936  0.5  3.8 383724 38836 ?        RNl   2015 139:04 /var/awslogs/bin/python /var/awslogs/bin/aws logs push --config-file /var/awslogs/etc/awslogs
    root     13356  0.0  0.0      0     0 ?        S<    2015   0:00 [kworker/u31:1]
    root     17413  0.0  0.0      0     0 ?        S    17:40   0:00 [kworker/u30:0]
    ubuntu   21345 46.5 10.6 1028884 108720 pts/1  Rl+  18:03   0:18 npm                                          
    ubuntu   21359  0.0  0.1  17164  1324 pts/0    R+   18:04   0:00 ps aux

All the rest of the entries are %CPU 0. WHere shall I start looking for what might be slowing it down? I didn't make any change apart from pulling the code from git repository.

EDIT: Its t2.micro instance on free tier

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  • 1
    Is it a t1/t2 instance? If so, npm update may well run you out of CPU credits. top would be more useful than ps aux, particularly the load averages.
    – ceejayoz
    Commented Jan 14, 2016 at 18:16
  • did you try stopping/starting? We had many instances that would requires a complete power cycle before coming back to life. (do not do a restart or reboot).
    – zerobane
    Commented Jan 14, 2016 at 18:18
  • @zerobane not yet, I was hoping I would be able to avoid stoppin/starting
    – spirytus
    Commented Jan 14, 2016 at 18:19
  • @ceejayoz its t2.micro on free tier.
    – spirytus
    Commented Jan 14, 2016 at 18:21
  • 1
    @spirytus The t1/t2 line are burstable instances. If you use a lot of CPU for more than 30+ seconds, their performance can be severely capped. Like to 10%.
    – ceejayoz
    Commented Jan 14, 2016 at 19:14

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