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cli_help_axis.md

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Axis Specification

The --axis <axis spec> option redefines the values in a benchmark's axis. It applies to the benchmark created by the most recent --benchmark argument, or all benchmarks if it precedes all --benchmark arguments (if any).

Valid axis specification follow the form:

  • <axis_name>=<value>
  • <axis_name>=[<value1>,<value2>,...]
  • <axis_name>=[<start>:<stop>]
  • <axis_name>=[<start>:<stop>:<stride>]
  • <axis_name>[<flags>]=<value>
  • <axis_name>[<flags>]=[<value1>,<value2>,...]
  • <axis_name>[<flags>]=[<start>:<stop>]
  • <axis_name>[<flags>]=[<start>:<stop>:<stride>]

Whitespace is ignored if the argument is quoted.

The axis type is taken from the benchmark definition. Some axes have additional restrictions:

  • Numeric axes:
    • A single value, explicit list of values, or strided range may be specified.
    • For int64 axes, the power_of_two flag is specified by adding [pow2] after the axis name.
    • Values may differ from those defined in the benchmark.
  • String axes:
    • A single value or explicit list of values may be specified.
    • Values may differ from those defined in the benchmark.
  • Type axes:
    • A single value or explicit list of values may be specified.
    • Values MUST be a subset of the types defined in the benchmark.
    • Values MUST match the input strings provided by --list (e.g. I32 for int).
    • Provide a nvbench::type_strings<T> specialization to modify a custom type's input string.

Examples

Single Value

Axis Type Example Example Result
Int64 -a InputSize=12345 12345
Int64Pow2 -a InputSize[pow2]=8 256
Float64 -a Quality=0.5 0.5
String -a RNG=Uniform "Uniform"
Type -a ValueType=I32 int32_t

Explicit List

Axis Type Example Example Result
Int64 -a InputSize=[1,2,3,4,5] 1, 2, 3, 4, 5
Int64Pow2 -a InputSize[pow2]=[4,6,8,10] 16, 64, 256, 1024
Float64 -a Quality=[0.5,0.75,1.0] 0.5, 0.75, 1.0
String -a RNG=[Uniform,Gaussian] "Uniform", "Gaussian"
Type -a ValueType=[U8,I32,F64] uint8_t, int32_t, double

Strided Range

Axis Type Example Example Result
Int64 -a InputSize=[2:10:2] 2, 4, 6, 8, 10
Int64Pow2 -a InputSize[pow2]=[2:10:2] 4, 16, 64, 256, 1024
Float64 -a Quality=[.5:1:.1] 0.5, 0.6, 0.7, 0.8, 0.9, 1.0
String [Not supported]
Type [Not supported]