odd load patterns

From	Miles Fidelman <mfidelman@meetinghouse.net>
Newsgroups	linux.debian.user
Subject	odd load patterns
Date	2016-09-14 02:10 +0200
Message-ID	<sh5W2-Mu-9@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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Hi,

I wonder if anybody might have some thoughts on this:

Lately, our server has been showing high loading, but top shows that the 
CPU is mostly in wait mode, and iotop shows low disk i/o traffic.

Usually, the system shows high load when either

a. Someone is indexing our web server (which shows up as CPU load on 
apache).

b. Our list manager is processing a bunch of traffic (most of the load 
comes from spam and virus filtering - which shows up as cpu load on 
amavisd, and clamd, as well as a lot of disk i/o).

The one place I see this effect behavior, if for email clients accessing 
IMAP - I've been seeing timeouts, and exceptionally high delays to load 
an inbox, or move stuff to the trash.

This pattern is new - and there's really nothing that I've changed in 
terms of configuration or loading that I can see.

So... any thoughts?  Any diagnostic approaches?

Thanks much,

Miles Fidelman

-- 
In theory, there is no difference between theory and practice.
In practice, there is.  .... Yogi Berra

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Thread

odd load patterns Miles Fidelman <mfidelman@meetinghouse.net> - 2016-09-14 02:10 +0200
  Re: odd load patterns Frédéric Marchal <frederic.marchal@wowtechnology.com> - 2016-09-14 09:00 +0200
    Re: odd load patterns - SOLVED Miles Fidelman <mfidelman@meetinghouse.net> - 2016-09-14 16:20 +0200
      Re: odd load patterns - SOLVED Tanstaafl <tanstaafl@libertytrek.org> - 2016-09-14 16:50 +0200
  Re: odd load patterns Curt <curty@free.fr> - 2016-09-14 10:10 +0200

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