Dear all, just by chance, I've found the following gretl warning: <gretlcli> *** Warning *** * * gretl is built using OpenMP, but is linked against * OpenBLAS parallelized via pthreads. This combination * of threading mechanisms is not recommended. Ideally, * OpenBLAS should also use OpenMP. </gretlcli> I am not sure how to respond to this correctly. Usually I compile gretl on ubunty by running <terminal> ./configure --enable-build-doc --enable-openmpi </terminal) and get the output <configure> Installation path: /usr/local Use readline library: yes Use gnuplot for graphs: yes Use pdflatex for typesetting: yes Use libgsf for zip/unzip: no sse2 support for RNG: yes OpenMP support: yes MPI support: no AVX support for arithmetic: yes Build with GTK version: 2.0 Build gretl documentation: yes Use Lucida fonts: no Build message catalogs: yes Build gretl addons: no X-12-ARIMA support: yes TRAMO/SEATS support: yes libR support: yes ODBC support: no JSON parsing support: yes Experimental audio support: no Use xdg-utils in installation: if DESTDIR not set LAPACK libraries: -llapack -lblas -lgfortran </configure> The package libopenmpi-dev is installed. $sysinfo yields <sysinfo> bundle anonymous: nproc = 4 blascore = Haswell hostname = atdesktop os = linux mpi = 0 blas = openblas omp_num_threads = 4 omp = 1 blas_parallel = pthreads mpimax = 0 wordlen = 64 </sysinfo> Any thoughts? Thanks Artur