Currently I am working on new App Engine application.
Unfortunately it seems that my application uses to lot of resources even for relatively small user number. So I need to determine its bottle necks and optimize them.
GAE lets users record data and run diagnostics on applications to gauge performance. Security features. GAE enables users to define access policies with the GAE firewall and managed Secure Sockets Layer/Transport Layer Security certificates for free. Traffic splitting.
Cloud Profiler is a statistical, low-overhead profiler that continuously gathers CPU usage and memory-allocation information from your production applications.
To store data and files on App Engine, you can use Google Cloud services or any other storage service that is supported by your language and is accessible from your App Engine instance. Third-party databases can be hosted on another cloud provider, hosted on premises, or managed by a third-party vendor.
Appstats: RPC Instrumentation for Google App Engine. It is being developed by Guido himself.
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EDIT: I believe AppStats will not work with Java, but there are some tips here.
The Eclipse plugin for the Google App Engine provides a local App Engine environment in which you can run your program in debug or profile mode. Perhaps this could provide the information you need?
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