Google I/O 2010 - Appstats - instrumentation for App Engine

Google I/O 2010 - Appstats - RPC instrumentation and optimizations for App Engine

App Engine 201

Guido van Rossum

Appstats is a pure userland library (for Python and Java) that inserts instrumentation hooks into the App Engine runtime at the interface between the runtime and services like the datastore. The collected statistics can be browsed in a rich UI which allows drilling down to various levels of detail. The talk will also discuss common optimizations to address typical findings.

For all I/O 2010 sessions, please go to http://code.google.com/events/io/2010...

• Category

  Science & Technology

[David Pärsson]

As I understand it, he suggests that Memcache should not be used to reduce the number of GETs/querie calls in a single request, because that would just replace slow RPCs with faster, but still slow, RPCs. Memcache still has its valid uses.

[mbukarewicz]

Did he suggest not to use Memcache (since it takes 10ms to 20ms) and prefer in-memory cache (which can take ~10microseconds at most) ? It'd definitely faster but much less reliable...