On 2016-09-14, Miles Fidelman <mfidel...@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I'm looking here (maybe a little outdated from 2010?): https://www.tummy.com/articles/isolating-heavy-load/ Maybe an idea or two.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
