[ome-devel] Problem with float point image channel min/max range

[José Salavert Torres]

Sorry there was an error in the previous e-mail. To reproduce the issue the web gateway call were wrong:

Please, can you simply import entry EMD-2796:

ftp://ftp.ebi.ac.uk/pub/databases/emdb/structures/EMD-2796/map/emd_2796.map.gz <ftp://ftp.ebi.ac.uk/pub/databases/emdb/structures/EMD-2796/map/emd_2796.map.gz>

Into a running instance of OMERO and ask for:

	… /webgateway/render_image_region/<image_id>/99/0?c=1|0:0&region=26,29,169,169  (service down)
	… /webgateway/render_image_region/<image_id>/99/0?c=1|-0.000475:-0.000476&region=26,29,169,169 (too much compute time)

to the web gateway and check both issues.



> On 23 Jun 2015, at 12:48, Josh Moore <josh at glencoesoftware.com> wrote:
> 
> On Tue, Jun 23, 2015 at 1:13 PM, José Salavert Torres <josator at ebi.ac.uk <mailto:josator at ebi.ac.uk>> wrote:
>> Dear OMERO developers,
> 
> Hi José,
> 
> 
>> I am on commit “c6f9a94b0a16ac352e1d7287954d08c0d881eb06”.
>> When asking for images through the Webserver gateway, I have experienced a
>> problem that hangs the server.
>> 
>> 
>> If I send an URL like:
>> 
>> ... /webgateway/render_image_region/35203/99/0?c=1|0:0&region=29,0,169,169”
>> 
>> with the channel min and max values equal to zero:
>> 
>> ?c=1|0:0
>> 
>> the server starts an intensive computation and stops returning any other
>> image requests (the service is down due the overloading until you reset it).
>> 
>> Also, if the minimum / maximum range is smaller than the precision this has
>> an impact in the performance that is greater the narrower this range is. i.e
>> given :
>> 
>> min = -10
>> max = 30
>> 
>> A call with:
>> 
>> ?c=1|20.00:22.01
>> 
>> Will trigger an image calculation that will take a lot of time and
>> resources, slowing down the server and making it unresponsive for several
>> minutes.
>> 
>> Can you reproduce these issues?
> 
> Before we start trying to reproduce, is there a reason you're using a
> pre-release version (5.1.0-m4)? There are some 2000+ commits between
> what you're working on and the current release tag ("v5.1.2").
> 
> Cheers,
> ~Josh.
> 
>> José
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