On 11/23/16 17:27, Ed Schouten wrote:
Hi Hans,

2016-11-23 15:27 GMT+01:00 Hans Petter Selasky <h...@selasky.org>:
I've made a patch to hopefully optimise SAT solving in our pkg utility.

Nice! Do you by any chance have any numbers that show the performance
improvements made by this change?

Hi Ed,

I tried measuring with "time", but figured out that it was doing a lot of other stuff too. Isolating this piece of code was not so easy.

> Assuming that the SAT solver of
pkg(1) uses an algorithm similar to DPLL[1], a change like this would
affect performance linearly. My guess is therefore that the running
time is reduced by approximately 5/12. Is this correct?

By the way, why attach a zip file with a diff? GitHub's pull requests
are awesome! :-)

GitHub wouldn't allow me to make a .diff attachment.

[1] Davis-Putnam-Logemann-Loveland algorithm:

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