We're generally very happy with iipserver & the iipmooviewer combination, it's
working well for us, but one thing is puzzling me - sometimes a proportion
(about 1/4) of the tiles are very slow to load, in the order of 1s, while
the other tiles are loading < 100ms.I'm attaching firebug traces for you to
see just how much of a problem it is.
I've looked at the iipserver log, but that thinks that the particular tile is
being served up in the same kind of timescale as the others. We're using
apache 2.2.15 with mod_fcgid but I can't see anything in that config that
would be hindering us.
Anybody any ideas?
(1st screenshot, 4 tiles, 1 slow):
(2ns screenshot, 12 tiles, 3 slow):
Once the tiles have been viewed once, loading is fine, so once they're in a
cache somewhere everything's OK (but we have 100s of thousands of images, so
many millions of tiles, they won't all be cached!).
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So the iipsrv log timings don't show anything slow? What about Apache? Do the
timestamps correspond to the timings in firebug? It's also possible this is
something linked to your version of Firefox. Do you still get these delays in
Chrome? And you say that once in cache, everything is fast, but how about
trying to first empty the cache and reloading. Is it always the same tiles
that are slow or is it random?
Ruven, thanks for your reply, sorry I haven't been about to get back to you
earlier. The iipsrv log seems to show all tiles being generated in the same
~40ms as all the others, so it's probably not an iipserver problem, but in
case anybody else had experienced the same thing, I was asking here.
I haven't gone back to correlate the firebug & apache logs, I'll do that next
(it'll be next year now). Then I'll try emptying the cache.
Chrome behaves the same, so I don't think it's a client-side thing, and all
the requests get fired off at once, it's just the response that's slow, so
it's not likely to be an iipmooviewer problem.
If I can't make it go away, I'll try lighttpd!