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The vast majority of time on research supercomputers is used in running Fortran codes. (Click on 'languages' https://www.archer.ac.uk/status/codes/ , this is the UK national facility.)

And yes, as you've noticed almost all linear algebra is written in Fortran (BLAS, LAPACK, ScaLAPACK), so no matter what language you've written something to do some useful computation in, it's likely that most of the cycles are spent in Fortran!




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