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Speed up string to real #498

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jacobwilliams opened this issue Nov 6, 2021 · 1 comment · May be fixed by #499
Open

Speed up string to real #498

jacobwilliams opened this issue Nov 6, 2021 · 1 comment · May be fixed by #499
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jacobwilliams commented Nov 6, 2021 •
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See the discussions here and here. There is a lot of room for improvement in the string to real parsing (which is currently using read(fmt=*) which is apparently quite slow.

The C strtod routine is much faster. Could add it as an option, or maybe even the default. Is it a guarantee that every Fortran compiler will have this? Seems to be true for Gfortran and Intel.
@jacobwilliams jacobwilliams self-assigned this Nov 6, 2021
@jacobwilliams jacobwilliams linked a pull request Nov 6, 2021 that will close this issue
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See also: https://fortran-lang.discourse.group/t/speed-of-atoi-and-atof-vs-internal-read/3375

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WIP: Speed jacobwilliams/json-fortran
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