On Thu, Jun 18, 2009 at 6:50 PM, mclovin <[email protected]> wrote: > > Ok, so my output from Carsten's suggestion was an average of about > 7800, so how exactly does that correlate with how much I would be > paying (obviously per request) if I was to launch my app on the GAE? I > just need a very rough estimate so I can estimate the long term costs.
Multiply the average number of CPU-seconds for a page by the number of hits per day you expect it to get. > > > Also how much CPU usage does it take for Google to red flag your app > for too much CPU usage if you use paid billing? It would be > unfortunate if I launched my app and then all my requests from users > timed out because of Google blocking my account because of CPU usage > even if I was paying for it. We won't block you for using 'too much' of any paid quota, as long as you haven't hit your billing limits. -Nick Johnson > > > On Jun 15, 5:34 am, "Nick Johnson (Google)" <[email protected]> > wrote: > > Hi Carsten, > > > > You're correct that the best way to do this is to run the code on App > Engine > > and see just how many CPU cycles your requests require. You don't need a > > load test, however: You can see exactly how many CPU milliseconds a > request > > required by looking at the logs page of the admin console. Just run a few > > tests to get an average. Note that the first request to a runtime > instance > > will generally cost more than subsequent ones; you may want to make this > > clear by logging something in a request when it's the first one, so you > can > > tell them apart easily. > > > > CPU cycles are infuriatingly difficult to convert, with different > > architectures having different characteristics, even down to > per-operation > > differences. What did you have in mind when you suggest it's something we > > need to improve? > > > > -Nick Johnson > > > > > > > > On Sun, Jun 14, 2009 at 10:51 AM, CarstenN <[email protected]> wrote: > > > > > I'm interested in the same. I know that you can get the clock-cycles a > > > request used so far by calling quota.get_request_cpu_usage(), but I > > > don't find this to be very useful as an absolute measurement. > > > > > The docs state (on the quota page): 'CPU time is reported in > > > "seconds," which is equivalent to the number of CPU cycles that can be > > > performed by a 1.2 GHz Intel x86 processor in that amount of time. The > > > actual number of CPU cycles spent varies greatly depending on > > > conditions internal to App Engine, so this number is adjusted for > > > reporting purposes using this processor as a reference measurement.' > > > > > So, in theory, a CPU second would be about 1.2 billion clock cycles. > > > But I highly doubt it works that way in practice. So my current > > > solution is to just implement the CPU intensive parts and hit them > > > with a load test (And have a backup plan in case the CPU usage > > > policies change again). > > > > > IMHO this is something that Google really needs to improve. App Engine > > > does lack transparency in some areas - and given that it's a product > > > meant to appeal to engineers that's a real flaw. > > > > > On Jun 14, 2:13 am, mclovin <[email protected]> wrote: > > > > I wanted to see if an app would be cost effective to deploy on > > > > google's app engine and i guess one of the main areas i am concerned > > > > with is CPU usage. Is there a way to calculate how many CPU hours it > > > > will use on Google's servers? (the app is already running on my > > > > computer via django) I dont think an hour of CPU time on my computer > > > > is comparable to a "CPU Hour" but I guess I may be wrong. > > > -- Nick Johnson, App Engine Developer Programs Engineer Google Ireland Ltd. :: Registered in Dublin, Ireland, Registration Number: 368047 --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en -~----------~----~----~----~------~----~------~--~---
