Hi Alan, On Wed, Dec 14, 2011 at 7:15 PM, Alan Xing <[email protected]> wrote: > Dear there, > > Our app 'snsanalytics' experienced more than 40% front end CPU hours usages > on Dec 13, comparing to Dec 12. Our traffic level on Dec 13 is actually flat > to less comparing to that of Dec 12. Except for the abnormal increase of > front end CPU hours, there is no any noticeable change on other resource > consumption like db write/read. > > There is absolutely no change from our side that can explain this increase. > We didn't deploy any code in between. We didn't have any heavy lifting > operations. Nothing we did is unusual comparing to previous day. > > Could any one from GAE team help explain/investigate what happened?
I took a very quick look at your application. It looks like your datastore reads and writes did increase by about 10% between those two days. Your latency also increased for about 12 hours (without an increase in CPU usage). It is possible that a small increase in datastore latency slowed down your application enough that more instances were needed to service requests. It could also be that you had some particularly long running IO-bound tasks. But I don't have any strong evidence of either case (the latency increase does correlate with the increase in billed instances but I can't easily say why your latency increased). Cheers, Brian > Thanks, > Alan > > -- > 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. -- 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.
