Performance Anomaly in Early December

[Bill Hart]

The performance plots for Pyomo indicate that "something" changed in late Nov or early December.

Almost uniformly, performance for writers using PyPy and CPython 2.7 worsened, while performance for Python 3.6 improved.

Looking at the commit logs, I cannot discern what PR might have led to this change.  Does anyone have insights to share?

--Bill

[Bill Hart]

@Gabe:

There were changes to kernel in this time period, which might have led to these performance differences.  But I can't convince myself that these changes would necessary impact the performance tests.  I don't see how they rely on kernel.

--Bill

[Siirola, John D]

I updated the default Python interpreters at the beginning of December (around the 2nd). They were compiled slightly differently than before. I added the optimization flag, which was supposed to make things faster. That doesn’t explain pypy, though (only updated Python 2.7, 3.3-3.7).

John

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[Bill Hart]

OK.  I'll update the baseline data and see if that corrects this anomaly.

--Bill

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