AW: [Seaside] Re: Concurrent requests from multiple sessions

Nowak, Helge HNowak at
Tue Mar 10 11:31:44 UTC 2015


I am sure Ondrej understood what was proposed. He mentioned at least twice that the DB connections are NOT the problem. He said that the processing AFTER loading the data from the database into the image is the problem. Why shouldn't I believe him? OTOH I believe you Seaside experts that Seaside's architecture is inherently non-blocking between sessions.

Thus there are two questions:
- how could any processing block the whole Seaside image?
- how to find possibly problematic spots in Ondrej's application code?

Once that is resolved one could think about further improvements.


-----Ursprüngliche Nachricht-----
Von: seaside-bounces at [mailto:seaside-bounces at] Im Auftrag von Sven Van Caekenberghe
Gesendet: Dienstag, 10. März 2015 12:12
An: Seaside - general discussion
Betreff: Re: [Seaside] Re: Concurrent requests from multiple sessions

> On 10 Mar 2015, at 11:15, wilwarin <Ondrej.Altman at> wrote:
> ( I tried Sven's code and it is possible to do another work during 
> waiting, it is OK. )

Does it also work (slowly) during the benchmark ?
That simulates your 'long running work'.

>> But that problem (not being able to process concurrent requests) is 
>> certainly not inherent to Seaside or Pharo. If that were the case we 
>> should all stop using it.
> Hopefully I understand, so it is not the case. If I am correct, it 
> means that in Seaside it is necessary to solve similar situations with 
> different access. In case of for example difficult server-side 
> calculation (or processing of big amount of data), we have to count on 
> a possible problem with concurrent requests from multiple sessions. Am 
> I right? Or, if not, where could the problem lay?

What everybody here tries to explain to you is that the problem is most probably in your DB driver (in Smalltalk or further down): it probably cannot do more than one concurrent request (as it is currently implemented). That is not a Seaside nor a fundamental Smalltalk problem.

Try investigating that aspect, separate from Seaside._______________________________________________
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