Ma/improve solves #46
Merged
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Some paths are very much slower than others; choosing the right branching strategy can generate a 100000x speedup.
|
👍 |
|
I'm not very familiar with the stuff that interfaces directly with gecode, but it looks sane. I'm a bit wary of potentially changing the solutions we spit out for complicated graphs, but lots of people are suffering from the performance of some of the pathological cases so I think that tips the balance in favor. 👍 |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
The key change is tweaks to the branchers to avoid some pathological cases with complex problems.
Choosing the package_versions variable to be INT_VAR_SIZE_MIN causes us to spend a large amount of time permuting variables that don't generate many propagations. Switching that to INT_VAR_DEGREE_MAX causes the solver to focus on the most 'influential' package versions first.
Also included are some refactors; a cleanup to avoid segfaulting with the new timer code.
Finally there's preliminary support for the GIST solve visualization tool; that was very helpful to tune the branchers.