[Ipopt] Ipopt parallelism

[gio.srt at gmail.com]

Hi everyone,

I’m using Ipopt on a server as a guest, meaning that I have no idea how Ipopt has been compiled or maintained. Ipopt is lunched within a Python script using Pyomo with the following options:

max_iter=1000
acceptable_tol=0.001
honor_original_bounds=no
max_cpu_time=20

The server is running Ipopt version 3.12.2, using ma27 (this is what the solver output says).

My problem is that Ipopt is using more than one core, which I don’t like in this case. The linear solver is definitely not the source of the parallelism, since only MA86 and M97 support that, which reduce the area of research to Blas, if I’m not mistaken.

Any idea how I could force Ipopt to use only one core without knowing exactly what going on in the background? Or, say that Blas is causing those parallel calls, how do I disable that during run time?

Thanks,

Giorgio