Install advice?

Mark Ungrin mdungrin at
Fri Jan 24 18:05:53 EST 2014

In terms of hardware, I assume more / faster processors will be a good
thing, but does openslide benefit from GPUs (i.e. does the graphics card
matter at all)?



On 1/15/2014 11:08 PM, Benjamin Gilbert wrote:
> 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 is supposed to be example code 
> it doesn't have the hack.
> --Benjamin Gilbert
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Dr. Mark Ungrin, Ph.D.
Assistant Professor
Department of Comparative Biology & Experimental Medicine
HMRB 320, 3330 Hospital Drive NW
Calgary, AB  T2N 4N1
University of Calgary, Faculty of Veterinary Medicine

Email: mark.ungrin at

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