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Measure backend fetch time
st-varnish at luettgert
Feb 3, 2020, 6:58 AM
Post #1 of 2 (550 views)
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Hello,

I was looking for a way to measure "how much backend time is saved" by
a cached object during its lifetime, in VCL. Simple approach:

In vcl_hit or vcl_deliver, look at

saved_time = obj.hits * fetch_time

Is there a way to get the time used for fetching from the backend?

Thanks and regards,
Torsten


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Re: Measure backend fetch time [ In reply to ]
slink at schokola
Feb 3, 2020, 7:20 AM
Post #2 of 2 (550 views)
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On 03/02/2020 15:58, Torsten Luettgert wrote:
> Is there a way to get the time used for fetching from the backend?

you can not access the fetch time from vcl because there is no vcl subroutine
called after the body has been fetched.

But you can get the data from varnishlog, you might want to look at the Resp
Timestamp: http://varnish-cache.org/docs/trunk/reference/vsl.html#timestamps

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