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Re: odd load patterns

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On 2016-09-14, Miles Fidelman <mfidelman@meetinghouse.net> wrote:
> 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.

I'm looking here (maybe a little outdated from 2010?):

https://www.tummy.com/articles/isolating-heavy-load/

Maybe an idea or two.

> 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
>


-- 
“Whatever is rejected from the self, appears in the world as an event.” 
C.G. Jung

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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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