https://github.com/wg/wrk

benchmarks 

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#!/usr/bin/env bash

echo
MW=$1 USE_ASYNC=$2 node $3 &
pid=$!

sleep 2

wrk 'http://localhost:3333/?foo[bar]=baz' \
  -d 3 \
  -c 50 \
  -t 8 \
  | grep 'Requests/sec' \
  | awk '{ print "  " $2 }'

kill $pid

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brew install wrk
wrk -v