3.12 GFORTRAN_FORMATTED_BUFFER_SIZE—Set buffer size for formatted I/O
The GFORTRAN_FORMATTED_BUFFER_SIZE environment variable specifies buffer size in bytes to be used for formatted output. The default value is 8192.
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https://gcc.gnu.org/onlinedocs/gcc-10.2.0/gfortran/GFORTRAN_005fFORMATTED_005fBUFFER_005fSIZE.html
