44 lines
665 B
Ruby
44 lines
665 B
Ruby
require "benchmark"
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class Stats
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def initialize
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@n = 0
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@mean = 0.0
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@variance = 0.0
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end
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attr_reader :n , :mean , :variance
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def add(x)
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@n = @n + 1
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delta = x - @mean
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@mean = @mean + delta/@n
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@variance = @variance + delta*(x - @mean)
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end
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def show
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#puts "no per var"
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puts "#{@n} #{@mean} #{@variance / @n}"
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end
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end
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class Runner
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def initialize
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@stats = Stats.new
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@cmd = ARGV[0]
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end
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def run
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while true
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once
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end
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end
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def once
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GC.disable
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took = Benchmark.measure { %x(#{@cmd} > /dev/null)}.real
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GC.enable
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@stats.add took
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@stats.show
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end
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end
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Runner.new.run
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