varnish-dev at varnish-cache.org: Swap flushes all objects in cache

[Anand Shah]

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 <lkarsten at varnish-software.com>
Sent: Tue, 18 Nov 2014 16:07:51 
To: Anand Shah <anand at rediff-inc.com>
Cc: varnish-dev at varnish-cache.org
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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