3.13 GFORTRAN_UNFORMATTED_BUFFER_SIZE—Set buffer size for unformatted I/O
The GFORTRAN_UNFORMATTED_BUFFER_SIZE environment variable specifies buffer size in bytes to be used for unformatted output. The default value is 131072.
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https://gcc.gnu.org/onlinedocs/gcc-11.1.0/gfortran/GFORTRAN_005fUNFORMATTED_005fBUFFER_005fSIZE.html
