On Mon, Mar 1, 2010 at 05:03, AchipA <attila.cs...@gmail.com> wrote: > 3 is the correct choice for several reasons. If the jobs should not > overlap, it's the scripts reponsibility to provide a check and react > accordingly. IMHO Cron should not skip tasks or change the start time > voluntarily (it's not a resource manager). Also, 3 is how the 'real' > cron works.
+1 > > On Mar 1, 5:27 am, mdipierro <mdipie...@cs.depaul.edu> wrote: >> follow up... >> >> one thing is not clear to me. Say a cron job should start every 10 >> minutes. If the actual execution of the job takes longer (say 15 >> minutes) what is the right thing to do? >> 1) Queue them (thus running every 15 minutes but the size of the queue >> gets longer and longer)? >> 2) Skip an extra ten minutes (thus running in effect only once every >> 20 minutes)? >> 3) Start them anyway (and assume they will not conflict with each >> other)? >> >> I am leaning for option 3. >> >> On Feb 28, 10:22 pm, mdipierro <mdipie...@cs.depaul.edu> wrote: >> >> > I discovered a race condition problem in web2py cron. This may cause >> > spikes in the number of web2py processes and eat lots of memory on >> > your system when running multiple processes. Some of you have reported >> > the problem. >> >> > I changed wsgihandler in trunk and replaced >> >> > from gluon.contrib.wsgihooks import ExecuteOnCompletion2, >> > callback >> > application = ExecuteOnCompletion2(gluon.main.wsgibase, callback) >> >> > with >> >> > application = gluon.main.wsgibase >> >> > thus disabling cron by default in this situation. >> >> > I think this problem can be fixed by using file locks instead of the >> > current cron.py locking mechanisms. I am close to a solution and will >> > post it tomorrow. >> >> > Massimo > > -- > You received this message because you are subscribed to the Google Groups > "web2py-users" group. > To post to this group, send email to web...@googlegroups.com. > To unsubscribe from this group, send email to > web2py+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/web2py?hl=en. > > -- Álvaro Justen - Turicas http://blog.justen.eng.br/ 21 9898-0141 -- You received this message because you are subscribed to the Google Groups "web2py-users" group. To post to this group, send email to web...@googlegroups.com. To unsubscribe from this group, send email to web2py+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/web2py?hl=en.
