Dear Varnish-Team,
while trying to optimize varnish performance for my company i've
noticed, that removing all comments from the vcls used in our
configuration tribles the requests per seconds from an easy ab test with
100% cache-misses. On an ab test with 100% cache-hits the improvement
was about 8-10%. I was a little bit shocked, because i've read that the
vcls are compiled to c and execution shouldn't depend on the amount of
comments.
I took a deeper look and found out, that the compiler appends a char
array of the vcl source (srcbody) to the VCL_conf. Which operations need
this data?
If these operations are not crucial for an production environment (e.g.
if it's just used for tracing and source output with -C), could you
please add an option to prevent the compiler to add such additional
information to the VCL_conf?
These operations would have to be reviewed, so they still work with this
option activated (if with less verbosity because of the missing data).
I know it's very helpful to have such informations in an staging
environment, but i wouldn't use tracing in production and so i might not
need this extra data there. The performance gain on the other hand could
be noticeable.
I might get a performance boost with the recent version of varnish
already by just minifying the vcl's in the deployment, but there still
would be a lot of data left in the VCL_conf, that may not be needed imo.
I hope you can shed some light on this matter.
Regards
Gordon
--
E-Mail-Signatur
*Gordon Schmidt*
Softwareentwickler - QA
Unister GmbH
Barfußgässchen 11 | 04109 Leipzig
Telefon: +49 (0)341 65050 - 25757
[email protected] <mailto:[email protected]>
www.unister.de <http://www.unister.de>
Vertretungsberechtigter Geschäftsführer: Thomas Wagner
Amtsgericht Leipzig, HRB: 19056
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