Indeed, if you let the app go cold, you will quickly spend a large amount of your GAE free quota on starting up the app (in addition to having a really slow load of the first page).
I have a cron task on a separate box that wget-s the whole site every 3 seconds. This ends up eating up about 20% of my free quota every day; however, it keeps GAE from swapping it out and having to cold start the app (which, would have still easily eaten 20% of my free CPU quota anyway). Not to mention, that when the app is not swapped out, there's no real penalty "on first load". Not the perfect solution but it works. Regards, Alex K On Mon, Jun 7, 2010 at 2:40 PM, Andreas Andreou <andy...@di.uoa.gr> wrote: > > http://www.answercow.com/2010/03/google-app-engine-cold-start-guide-for.htmlis > an interesting read on how much startup time is spent on several java > libraries at > GAE > > On Mon, Jun 7, 2010 at 19:38, Howard Lewis Ship <hls...@gmail.com> wrote: > > That's interesting, that GAE shuts down your instances. There's a bit of > > Tapestry based on the idea that the application is long running, so it's > OK > > if it takes a moment to start up initially. Under GAE that's not the case > > ... perhaps Tapestry under GAE should be even a bit lazier about loading > and > > instantiating. > > > > When GAE shuts down the instance, is it undeploying the WAR? All told, I > > think the most significant amount of time spent starting up a T5 app is > the > > initial load of all those classes. I can see these during the Selenium > > integration tests, where the second test app to start up (all within the > > same JVM) is much faster because all the framework classes have already > been > > loaded. > > > > > > On Mon, Jun 7, 2010 at 7:01 AM, Thiago H. de Paula Figueiredo < > > thiag...@gmail.com> wrote: > > > >> On Mon, 07 Jun 2010 10:42:52 -0300, Dmitry Gusev < > dmitry.gu...@gmail.com> > >> wrote: > >> > >> This is exactly what I mean, I don't want tapestry to load even once > for > >>> some requests. GAE shutdown/startup instances very often (one new > instance > >>> per ~3 minues) and this consumes additional resources. > >>> > >> > >> Oops, I forgot this GAE characteristic and what you said makes sense > now. > >> :) > >> > >> -- > >> Thiago H. de Paula Figueiredo > >> Independent Java, Apache Tapestry 5 and Hibernate consultant, developer, > >> and instructor > >> Owner, Ars Machina Tecnologia da Informação Ltda. > >> http://www.arsmachina.com.br > >> > >> --------------------------------------------------------------------- > >> To unsubscribe, e-mail: users-unsubscr...@tapestry.apache.org > >> For additional commands, e-mail: users-h...@tapestry.apache.org > >> > >> > > > > > > -- > > Howard M. Lewis Ship > > > > Creator of Apache Tapestry > > > > The source for Tapestry training, mentoring and support. Contact me to > learn > > how I can get you up and productive in Tapestry fast! > > > > (971) 678-5210 > > http://howardlewisship.com > > > > > > -- > Andreas Andreou - andy...@apache.org - http://blog.andyhot.gr > Tapestry PMC / Tacos developer > Open Source / JEE Consulting > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tapestry.apache.org > For additional commands, e-mail: users-h...@tapestry.apache.org > >
