[Ipopt] Ipopt parallelism

Anthony D. Kelman kelman at berkeley.edu
Sun Feb 12 02:16:44 EST 2017

Depends which blas implementation you're using, but there should be an
environment variable to control the threading.

On Feb 11, 2017 11:15 PM, <gio.srt at gmail.com> wrote:

> 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
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