Hi all, I've been working on an App Engine Profiler (http://code.google.com/p/ appengine-profiler/) and noticed a discrepancy between the reported CPU usage by the Quota API and the App Engine Logs.
I expected it that due to internal processes, the App Engine may report more CPU usage than we see by the Quota API. For example, if a new instance was started, this cost CPU resources and they are not accounted in the Quota API withing the request. However, I'm seeing the opposite issue here - more CPU usage is reported by the Quota API, and the App Engine Logs show less. For example, I get the CPU usage at the very beginning by google.appengine.api.quota.get_request_cpu_usage(), then do the same at the very end, and get the actual CPU usage in milliseconds by google.appengine.api.quota.megacycles_to_cpu_seconds(last_value - first_value). A request just shown 5656cpu_ms in the App Engine Logs interface, and 6184.17 calculated by the Quota API functions. Is there any logical explanation of this? The megacycles_to_cpu_seconds() failed? Some other internal secret of App Engine? :) Thanks. Cheers. -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
