bgilbert at cs.cmu.edu
Thu Jan 16 01:08:36 EST 2014
On 01/15/2014 03:07 PM, Mark Ungrin wrote:
> What would be your recommendations in terms of hardware for a slidedeck
> server, and how would it change for say 35 vs 100 vs 200 students?
I don't have specific recommendations. If you have 200 *simultaneous*
users, you might need a fair amount of CPU and I/O. If you try it, let
us know how it goes. :-)
If you have a large number of students and a small-to-moderate number of
slides, you may want to consider using VIPS to generate the Deep Zoom
tiles in advance. Then you'd just need to serve the tiles from disk
with a regular web server.
> Also slidedeck seems much faster than deepzoom when bringing up the
> initial image when first loading (both via Apache) - are they handling
> the images differently?
By default, when OpenSeadragon loads a Deep Zoom pyramid, it loads each
pyramid level in turn starting from the first. This is pointless, since
the 9th Deep Zoom level is less than 256 pixels on a side. SlideDeck
and the OpenSlide demo site have a hack to start OpenSeadragon at the
9th level, but since deepzoom_server.py is supposed to be example code
it doesn't have the hack.
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