jdb2 spike every hour for few seconds

Question

I get IO hang up every hour on the exact same time on my Ubuntu 18.04 server. iotop indicate that jbd2 spike to araong 30% around this time. The hangup last only few seconds. I started noticing this when mysql_slow_query log also get filled up around this time. I have no cron jobs running.

Ubuntu 18.04 in Linode server mysql 5.7 apache 2.4 php 7.2

iotop

iotop 2

Is there a Linux tool that can detect which program causes this problem?

score 0 · Accepted Answer · answered Feb 12 '20 at 13:15

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I found the problem. It was caused CPU steal by a noisy neighbor in the server. iostat 1 10 helped me debug the problem.

answered Feb 12 '20 at 13:15

Kusal Arthanayake

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jdb2 spike every hour for few seconds

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