Process time analysis and solver log

[Kiyo]

Hi,

I'm using AMPL Python API and I have two questions.

1. How can I get the process time breakdown?

I mean, I'd like to distinguish the processing time between the AMPL and optimization solver.

2. How can I get the detailed log of the optimization solver?

For example, if I directly call CPLEX, CPLEX outputs some logs.

When I use CPLEX via AMPL Python API, I'd like to check the CPLEX logs.

Best regards,

[AMPL Google Group]

> 1. How can I get the process time breakdown?
> I mean, I'd like to distinguish the processing time between the AMPL and optimization solver.

AMPL provides built-in timing parameters such as _ampl_time and _total_solve_time. You’ll find the complete list in Table A-14 in the reference appendix of the AMPL book.

Using amplpy, you can access for instance the value of "_total_solve_time" with ampl.getValue('_total_solve_time').

> 2. How can I get the detailed log of the optimization solver?

> For example, if I directly call CPLEX, CPLEX outputs some logs.
> When I use CPLEX via AMPL Python API, I'd like to check the CPLEX logs.

In order to get verbose output from CPLEX you can set "cplex_options" to "mipdisplay=2" with ampl.option['cplex_options'] = 'mipdisplay=2'. You can see other options at https://ampl.com/products/solvers/solvers-we-sell/cplex/options/.

--
Filipe Brandão
am...@googlegroups.com

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[Kiyo]

Thank you so much!

2021年7月15日木曜日 20:46:29 UTC+9 AMPL Google Group: