[Seaside] Re: Concurrent requests from multiple sessions

wilwarin Ondrej.Altman at seznam.cz
Fri Mar 6 13:03:45 UTC 2015

Thank you, Jan.

We will try it. Unfortunately we find out that a communication with a
database is not the worst part. But, if we have many results, there is a
need to process them before rendering and it takes most of time, which
blocks the image.

We assumed that almost every project is facing a similar issue - many
sessions requesting some server-side processing simultaneously - and it
won't be such difficult to make it all 'parallel'. 

Does it mean, that most of Seaside projects around have several images
behind, so user's request is not blocked by another one? Do we have any
other way to achieve that (instead of combination 'several images & load

Again, thank you all for your time.

Jan van de Sandt wrote
> Hi,
> By default a call to a database like DB2 will block the image in VASt. You
> can change this by setting the #AllCallsThreaded preference in
> AbtDbmSystem
> to true. Then the calls with use a differente OS thread and other
> processes
> in the image will continue to run.
> Jan.
> On Fri, Mar 6, 2015 at 11:17 AM, wilwarin <

> Ondrej.Altman@

> > wrote:
>> Hi all,
>> Currently we are developing a web application in Seaside, and it is
>> necessary for us to work in VAST. The application runs as a Windows
>> service,
>> and for a few days we are facing the following issue:
>> - At one moment there are two users (let's call them 'A' and 'B') logged
>> in
>> in the application, so we have two different sessions.
>> - 'A' requests a page with a long list of objects obtained from DB2, so
>> it
>> takes a number of seconds to get the results.
>> - Less than one second after 'A''s request, 'B' requests another page,
>> for
>> instance an easy static page.
>> - For the time the 'A''s request is handled, the 'B''s browser window
>> freezes and waits for those number of seconds mentioned above.
>> We searched really a lot, but still the results are not what we would
>> expect. This issue makes as confused, because in the future the
>> application
>> should serve hundreds of users with very similar combinations of
>> requests.
>> We didn't know, where our problem lies, so we tried a similar test with a
>> single page with a difficult calculation inside. Then we tried the same
>> in
>> Pharo to exclude the problem in VAST. Both with the same results.
>> Is there anything we are missing? What should we do to achieve a parallel
>> (or kinda better) processing of requests?
>> Thank you very much for your responses.
>> Ondrej
>> --
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