@willcattoneeca : Ok, many thanks for the clarifications.
Indeed, if users would like to give up using high-performance solvers like Cplex, there could be a notable performance penalty. And your results of about 3.5 times longer solution time for your model instance still do look reasonably good in that respect. Interestingly, Amit tried HiGHS last February with a comparable-sized model, and got less promising results:
AK> "encouraged by your enthusiasm for HiGHS, I also tried it on a small model that CPLEX solves in under a minute. It took one hour to solve it"
I am not sure which solver options he used, but it looks like the performance gap can be also much higher, depending on the model, like also VictorG confirmed.
Nevertheless, I think many users thus far happy with Cplex might want to work with it also under Julia, and in that case one might have a cost penalty instead (but not for academic users, as I think IBM offers free Cplex for academic use).
Concerning the ETSAP call for proposals on the feasibility evaluation, such was decided upon in the Bonn ExCo, and I thought you might be interested to submit such a proposal, if you have expertise on Julia.
Indeed, if users would like to give up using high-performance solvers like Cplex, there could be a notable performance penalty. And your results of about 3.5 times longer solution time for your model instance still do look reasonably good in that respect. Interestingly, Amit tried HiGHS last February with a comparable-sized model, and got less promising results:
AK> "encouraged by your enthusiasm for HiGHS, I also tried it on a small model that CPLEX solves in under a minute. It took one hour to solve it"
I am not sure which solver options he used, but it looks like the performance gap can be also much higher, depending on the model, like also VictorG confirmed.
Nevertheless, I think many users thus far happy with Cplex might want to work with it also under Julia, and in that case one might have a cost penalty instead (but not for academic users, as I think IBM offers free Cplex for academic use).
Concerning the ETSAP call for proposals on the feasibility evaluation, such was decided upon in the Bonn ExCo, and I thought you might be interested to submit such a proposal, if you have expertise on Julia.