On Fri, Jul 11, 2014 at 2:24 PM, Federico Leva (Nemo) <[email protected]> wrote: > > This does make me wonder, what do those graphs *actually* measure? Are > they really measuring a comparable/representative set of image requests > from which we can infer that one or the other method is intrinsically > faster than the other, or are they measuring different things e.g. for > some selection bias?
By "one or the other" you mean image load time for varnish hits vs. image load time for varnish misses (on-demand generated thumbnails)? We are measuring all MediaViewer image loads (with some random sampling to keep the volume sane), and check the X-Varnish headers to tell if it was a hit or a miss. I see no potential for selection bias there.
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