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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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    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. 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). Commented Jan 14, 2016 at 18:18
  • @zerobane not yet, I was hoping I would be able to avoid stoppin/starting Commented Jan 14, 2016 at 18:19
  • @ceejayoz its t2.micro on free tier. Commented Jan 14, 2016 at 18:21
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    @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%. Commented Jan 14, 2016 at 19:14

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