Wiki
Version 6 (modified by torial, 5 months ago)

explanatory comments and typo fixing

To Do

  • -turbo
  • using Stopwatch
  • profilers
  • benchmarks
  • avoid when possible: slicing, dynamic, exceptions, i/o
  • don't optimize if you don't need to, root of all evil

Example

From the discussion thread in the forums ( Why so slow?), some modified versions of the code are available for comparison:

  • With Python 3.6.0, running against a slightly modified version (for tracking time) with 50,000 loops yielded a run-time of 0.66819638 seconds.
  • An initial port (which included substantial refactoring to identify the cause of the different final results) with 50,000 loops yielded a run-time of 98.284 seconds (147x slower than the python implementation)
  • After numerous attempts at speed improvement, the cobra code was sped up to a run-time of 0.057 seconds (or 11x faster than python, or 1,724x faster than original implementation.

Some of the strategies attempting are listed below and whether they yielded much of a performance change:

  • Made sure the for loop variables had explicit types: yielded 33x improvement
  • Used float instead of decimal: yielded 7x improvement
  • Using multiplication instead of division: yielded 1.2x improvement
  • Converted Math.pow to Math.sqrt for square roots: yielded 1.05x improvement
  • Moved variable declarations into function-level scope: NO IMPROVEMENT
  • Replaced properties with public fields: 1.6x improvement

Discussions

Here are some select discussions on performance:

Attachments