Using IOS, what is the best place run a primal heuristic? Currently we are using IOS_V_BRANCH. The problem is that sometimes GLPK will overwrite ios->best with an inferior solution. To solve this, the program keeps a copy of the best solution in a safe place and always checks if ios->best was overwritten.
What do you think about adding a new callback (IOS_V_PRIMAL?) that would be called before IOS_V_BRANCH. After calling this callback GLPK would call cleanup_the_tree to try to prune some branches. Would a patch implementing this idea be welcome? Rafael
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