Requests suddenly slow / fine after restart

Bjoern Metzdorf bm at
Thu Apr 24 11:06:45 CEST 2008

Poul-Henning Kamp wrote:
> In message <480875C6.60503 at>, Bjoern Metzdorf writes:
>> Recently we had some problems with slow requests. Some static graphic 
>> files suddenly took several seconds to load instead of the usual 
>> milliseconds. After a restart of varnish everything was fine again and 
>> the very same graphic was fast again.
> You want to use some tool to graph your system activity so that you can
> see what system resource is causing your grief.
> Most likely it is disk-I/O, but without data it is impossible to be
> sure of that.
> A lot of varnish people seem be partial to the "Munin" tool for this.

We are graphing cache hits and client requests with cacti and have the 
machines in ganglia as well. I will have a look at the graphs the next 
time this happens.


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