ruby/benchmark/array_large_literal.yml

prelude: |
  def def_array(size)
    Object.class_eval(<<-END)
      def array_#{size}
        x = 1
        [#{(['x'] * size).join(',')}]
      end
    END
  end
  def_array(100)
  def_array(1000)
  def_array(10000)
  def_array(100000)
benchmark:
  array_100: array_100
  array_1000: array_1000
  array_10000: array_10000
  array_100000: array_100000
Optimize compilation of large literal arrays To avoid stack overflow, Ruby splits compilation of large arrays into smaller arrays, and concatenates the small arrays together. It previously used newarray/concatarray for this, which is inefficient. This switches the compilation to use pushtoarray, which is much faster. This makes almost all literal arrays only allocate a single array. For cases where there is a large amount of static values in the array, Ruby will statically compile subarrays, and previously added them using concatarray. This switches to concattoarray, avoiding an array allocation for the append. Keyword splats are also supported in arrays, and ignored if the keyword splat is empty. Previously, this used newarraykwsplat and concatarray. This still uses newarraykwsplat, but switches to concattoarray to save an allocation. So large arrays with keyword splats can allocate 2 arrays instead of 1. Previously, for the following array sizes (assuming local variable access for each element), Ruby allocated the following number of arrays: 1000 elements: 7 arrays 10000 elements: 79 arrays 100000 elements: 781 arrays With these changes, only a single array is allocated (or 2 for a large array with a keyword splat. Results using the included benchmark: ``` array_1000 miniruby: 34770.0 i/s ./miniruby-before: 10511.7 i/s - 3.31x slower array_10000 miniruby: 4938.8 i/s ./miniruby-before: 483.8 i/s - 10.21x slower array_100000 miniruby: 727.2 i/s ./miniruby-before: 4.1 i/s - 176.98x slower ``` Co-authored-by: Nobuyoshi Nakada <nobu@ruby-lang.org> 2024-01-27 21:16:52 +03:00			`prelude: \|`
			`def def_array(size)`
			`Object.class_eval(<<-END)`
			`def array_#{size}`
			`x = 1`
			`[#{(['x'] * size).join(',')}]`
			`end`
			`END`
			`end`
			`def_array(100)`
			`def_array(1000)`
			`def_array(10000)`
			`def_array(100000)`
			`benchmark:`
			`array_100: array_100`
			`array_1000: array_1000`
			`array_10000: array_10000`
			`array_100000: array_100000`