Run a series of curl requests and profile the mean / std. dev. of those requests

profile-curl.sh

#!/bin/bash

profile-curl() {
  local num_iters=500
  local num_warmups=10
  local -a times

  for x in $(seq 1 "${num_warmups}"); do
    curl -s -o /dev/null "$@" 2>&1
  done

  for x in $(seq 1 "${num_iters}"); do
    times+=($(curl -s -w '%{time_total}\n' -o /dev/null "$@"))
  done

  ruby -- - "${times[@]}" <<-EOS
    values = ARGV.map(&:to_f)
    μ = values.reduce(:+) / values.length
    σ = (values.map{ |x| (x - μ)**2  }.reduce(:+) / values.length) ** 0.5
    puts "μ = %.4f, σ = %.4f" % [μ, σ]
EOS
}

profile-curl "$@"