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@mojombo
Created September 15, 2009 20:07
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# Run the given block +num+ times and then print out the mean, median, min,
# max, and stddev of the run. For example:
#
# irb> stats(10) { sleep(rand / 100) }
# mean: 5.99ms
# median: 6.76ms
# min: 1.49ms
# max: 9.28ms
# stddev: 2.54ms
def stats(num)
records = []
num.times do
t0 = Time.now
yield
records << (Time.now - t0)
end
srecords = records.sort
mean = records.inject(0) { |acc, x| acc + x } / num.to_f
stddev = Math.sqrt(records.inject(0) { |sum, e| sum + (e - mean) ** 2 } / num.to_f )
puts "mean: %1.2fms" % (mean * 1000)
puts "median: %1.2fms" % (srecords[num / 2] * 1000)
puts "min: %1.2fms" % (srecords.first * 1000)
puts "max: %1.2fms" % (srecords.last * 1000)
puts "stddev: %1.2fms" % (stddev * 1000)
end
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