Re: [Help-glpk] glpk 4.65 release information

2018-03-13 Thread Chris Matrakidis
Hi Andrew, A few weeks ago you wrote: I'd like to note that sometimes '--cuts' is not a best choice. > I did an experiment regarding this. In particular, I tried 84 out of the 87 problems in the miplib 2010 benchmark set (the other 3 needed more than an hour to solve the root relaxation). I

Re: [Help-glpk] glpk 4.65 release information

2018-02-26 Thread Chris Matrakidis
Hi Andrew, I'd like to note that sometimes '--cuts' is not a best choice. For > example, air04 and air05 (hard set partitioning problems) from miplib > 3.0 are solved quickly (about 10 mins on my machine) with '--pcost', > but with cutting planes the solution takes more 6 hours. Probably this >

Re: [Help-glpk] glpk 4.65 release information

2018-02-26 Thread Andrew Makhorin
Hi Chris, > In order to test the release, I tried the 2010 MIPLIB benchmark set, > calling glpsol with "--pcost --cuts" and a two hour time limit. The > final result is in the attached file, but the quick summary is that 20 > problems from this set were solved, while there were three aborts.