I have noticed this everytime the memory offload happens. This is not a crash
or segfault; coz the service does not go down and it keeps in running which is
also evident in the graphs shared earlier. I can see the same behaviour
everytime when operating system swaps. Can you confirm if this is a ideal
behaviour with varnish?
Regards,
Anand
From: Lasse Karstensen <[email protected]>
Sent: Tue, 18 Nov 2014 16:07:51
To: Anand Shah <[email protected]>
Cc: [email protected]
Subject: Re: Swap flushes all objects in cache
On Mon, Nov 17, 2014 at 01:05:22PM -0000, Anand Shah wrote:
> Hello,When Linux pages outs data to disk; it destroys all cached
> objects which is contrary to the architecture published by PHK.When
> physical memory becomes scarce the Linux memory management subsystem
> must attempt to free physical pages.
[cut]
Hi.
Please consider adding line feeds to your future emails, everything on
one line is very hard to read.
Based on the attached graphs I'd expect this to be caused by Varnish
asserting/crashing, or that the operating system's out-of-memory
handling killed off the process.
More information on Varnish troubleshooting:
https://www.varnish-cache.org/docs/4.0/users-guide/troubleshooting.html
--
Lasse Karstensen
Varnish Software AS
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