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This might be a fun one for someone to track down in the runtime.
When doing large amounts of unformatted reads and writes, flang is slower than gfortran (especially on reads).
We have an example program here which writes a lot of binary data and then reads it back in.
gfortran appears to be about twice as flang when reading the data.
When run on one of our x86 systems here, this is the kind of output I got (combining the output of the program with time) using gfortran 7.3.0 and Flang built with LLVM 9:
This might be a fun one for someone to track down in the runtime.
When doing large amounts of unformatted reads and writes, flang is slower than gfortran (especially on reads).
We have an example program here which writes a lot of binary data and then reads it back in.
gfortran appears to be about twice as flang when reading the data.
When run on one of our x86 systems here, this is the kind of output I got (combining the output of the program with
time
) using gfortran 7.3.0 and Flang built with LLVM 9:Here's the program that prints the time to write, then read, the file:
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