yes. If the worker is not busy it starts the task immediately. You can also have more than one worker.
On Friday, 1 February 2013 11:10:11 UTC-6, José Luis Redrejo Rodríguez wrote: > > Thanks for your advice Massimo, but > does the scheduler start inmediately when no worker has been used before? > > > 2013/2/1 Massimo Di Pierro <massimo....@gmail.com <javascript:>>: > > All that you ask can be done using the scheduler except that your app > does > > not start the process, but submits a request to the scheduler. The > scheduler > > runs the app when a worker is available. This is to prevent spikes in > > resource utilization when multiple processes start. The task can > communicate > > with the app vid database and/or filesystem (which is ok but not 100% > > satisfactory). Web2py can monitor and kill running scheduler tasks. > > > > This works well for most types of tasks but not for tasks that need a > lot of > > IO with your application. I do not have a satisfactory solution in that > > case. You want the tasks to have some way to communicate asynchronously > with > > the client and this present major issues, some related with security. > > > > > > On Friday, 1 February 2013 10:22:35 UTC-6, José Luis Redrejo Rodríguez > > wrote: > >> > >> Hi, This is a question that has been asked several times in the list, > >> and I have also had to implement this kind of app in the past. > >> Now I'm also facing to another application where I need to run a > >> resource_and_time_consuming process managed from web2py. > >> > >> The exact problem is: > >> - From a web page, a long process must be started > >> - The web page must be updated as the process is being done > >> - The web page must be able to cancel the process. > >> > >> In the past I have had to deal with the fact of sessions lockings: > >> web2py server doesn't react while the process is being executed. I've > >> solved this by using session.forget(response), but this solution > >> avoids the use of session variables to update the process in the > >> original web page. > >> > >> I've used background processes, queues, etc, These solutions work when > >> time is not an issue, but not when the synchronization between the > >> process and the webpage must be fast and accurate > >> > >> I wonder if someone has a definitive pattern to do this kind of action. > >> > >> Regards > >> José L. > > > > -- > > > > --- > > You received this message because you are subscribed to the Google > Groups > > "web2py-users" group. > > To unsubscribe from this group and stop receiving emails from it, send > an > > email to web2py+un...@googlegroups.com <javascript:>. > > For more options, visit https://groups.google.com/groups/opt_out. > > > > > -- --- You received this message because you are subscribed to the Google Groups "web2py-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to web2py+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
