coin-or/Ipopt

Mumps and OpenMP

mottelet opened this issue · 6 comments

mottelet commented

Hello,

How do you prevent coinbrew to build thirdparty MUMPS with OpenMP ? I would like to make some reproductible tests and it seems impossible when MUMPS uses OpenMP. I currently use

./coinbrew fetch Ipopt@3.14 --without-asl --without-hsl --with-mumps --with-metis
./coinbrew build Ipopt@3.14 --prefix $PREFIX  --without-asl --without-hsl --with-mumps --with-metis --enable-static=yes --enable-shared=no --parallel-jobs 4

Thanks.

S.

svigerske commented

configure of ThirdParty-Mumps has an option --disable-openmp for that

mottelet commented

would giving --disable-openmp to coinbrew be enough ?

svigerske commented

Should be. coinbrew passes all flags it does not know about on to all calls of configure it is doing.

mottelet commented

Are there other possible causes of non-reproductibiliy of ipopt iterations ?

svigerske commented

Given the same input, it should produce the same output. Sometimes the linear algebra library need to be instructed to be more determinstic, e.g., https://www.intel.com/content/www/us/en/docs/onemkl/developer-guide-linux/2023-0/obtaining-numerically-reproducible-results.html

mottelet commented

OK. I have a different experience on macOS with Accelerate Framework on Intel (reproductibility issues) w.r.t. arm/M1 (no issue).