Jens Klein: Performance, Profiling, Power-Consumption

I want to focus on Python performance, so not caching or database performance.

Tools:

• py-spy: Overall mix of the whole live application, top-like.
• repoze.profile: WSGI middleware, slows down application. Profile single request and analyse its call stack by count, call time, etc.
• dis: disassembler for Python at the bytecode level.

Improvements Plone 5.2.0-5.2.3:

• Avoided early providedBy calls
• __getattr__ early exit on common attributes
• zope.interface: some functions are called hundreds of thousands of times when you reindex an index, so a tiny improvement helps a lot. I found various places that could use improvements, and that landed in the package, together with memory improvements by Jason Madden.

Live demo. I call py-spy with sudo because I need to connect to an existing process id.

Future Todo's:

• plone.restapi has optimization potential, all navigation related, but currently it still supports even Plone 4.3. This will likely wait for a 5.2-only or Python3-only branch.
• plone.registry is called too often
• Use python: expressions in all page templates. They are way faster than standard Tales expressions.
• More introspection.
• Move more logic from page templates to Python code

Advice: start introspecting the performance of your application.