futhark-dataset options...


Generate random values in Futhark syntax, which can be useful when generating input datasets for program testing. All Futhark primitive types are supported. Tuples are not supported. Arrays of specific (non-random) sizes can be generated. You can specify maximum and minimum bounds for values, as well as the random seed used when generating the data. The generated values are written to standard output.


-g type, --generate type
 Generate a value of the indicated type, e.g. -g i32 or -g [10]f32.
-s int Set the seed used for the RNG. Zero by default.
Set inclusive lower and upper bounds on generated values of type T. T is any primitive type, e.g. i32 or f32. The bounds apply to any following uses of the -g option.

You can alter the output format using the following flags. To use them, add them before data generation (–generate):

--text Output data in text format (must precede –generate). Default.
-b –binary
Output data in binary Futhark format (must precede –generate).
 Output data in binary Futhark format without header (must precede –generate).
 Only output binary Futhark format header for data (must precede –generate).


Generate an array of floating-point numbers and an array of indices into that array:

futhark-dataset -g [10]f32 --i32-bounds=0:9 -g [100]i32

To generate binary data, the --binary must come before the --generate:

futhark-dataset --binary --generate=[42]i32

It is possible to generate a single file containing a payload of values, and use custom headers to make different interpretations as e.g. a 2D array. For example we can generate a file only containing 256 i32 values by:

futhark-dataset --binary-no-header --generate=[256]i32 > 256.dat

Then we can run our program with different 2D-array configurations, without generating the array elements for each of them:

futhark-dataset --binary-only-header --generate=[1][256]i32 | cat - 256.dat | <Futhark program>
futhark-dataset --binary-only-header --generate=[2][128]i32 | cat - 256.dat | <Futhark program>
futhark-dataset --binary-only-header --generate=[4][64]i32 | cat - 256.dat | <Futhark program>


futhark-test(1), futhark-bench(1)