Posts GSoC 2019: Week 5

GSoC 2019: Week 5

With this the fifth week of the official coding period has ended. I will try to give a brief summary of my work during this week.

I spent most of this week learning the inner working of satask module. It took a lot of debugging to understand the on-going processes efficiently 😅 . My major job was to reduce the unwanted slowing portions in the code. I had #11789 for reference. Some of such performance reducing portions of code were:

  • A major segment of code was creating And objects unnecessarily. As suggested in #17087 the sorting in the And constructor takes up a significant amount of time. These have to be reduced.
  • Using SymPy objects is itself a bottleneck for performance. Having a system built over SymPy objects slows things down. Python’s built-in types should be used as much as possible.
  • A specific segment (used many times in the code) calls rcall over propositions. The rcall which is a recursive process also takes a significant of time.
  • Also, I have tried to pre-compile results as much as possible.

With the above and some other changes, the overall performance of satask has improved much. I have made a PR over this #17144. For an instance,

TestsAfter this PRIn master
test_satask2.39 s36.26 s
assumptions/tests16.74 s127.21 s

There is still scope for improvement in performance. In the coming week, I will try to work these out. I will also try to improve the performance of ask module.

Also, the first evaluations are over now and I feel happy to announce that I passed it. During the first phase I learnt a lot. In last few weeks I got to explore profiling and got to understand how small segments can influence performance. Before this I felt that I already know the codebase, but in reality I had much to explore. My mentors always gave me a good starting point and a direction over the course of this phase. With the hope to work much better in the coming phases, I take your leave now 😄 .

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