Timing NPM config performance in various node js versions

Readme.md

Timing npm config get prefix in order to test the performance problems of nvm. To run the tests you need to install 4, 5, 6, 7.0, 7.1 and 7.2 version of node with nvm and you should make sure that the correct version of npm is installed for each node version.

(Related to nvm-sh/nvm#1277)

(Note that the output is of the tests run on ubuntu 14.04)

npm-timings.sh

#!/bin/bash

source "$NVM_DIR/nvm.sh"

times() {
  total=0.0
  for n in {1..10}; do
    local duration=$(/usr/bin/time -f %e $@ 2>&1 1>/dev/null)

    total=$(bc <<< "$duration + $total")
  done
  printf $(bc <<< "$total * 0.1")
}

echo "\"node -v\", \"npm -v\", \"npm config get prefix ... 10\", \"node -p 1+1 ... 10\", \"./npm_config_hack.sh \$npm_home ... 10\""

for node in 4 5 6 "7.0" "7.1" "7.2"; do
  nvm i $node >/dev/null 2>&1
  npm_home=$(npm config get prefix)/lib/node_modules/npm
  echo "\"$(node -v)\", \"$(npm -v)\", $(times npm config get prefix), $(times node -p 1+1), $(times ./npm_config_hack.sh $npm_home)"
done

npm_config_hack.sh

#!/bin/bash

prefix=$1
node -e "require('$prefix/lib/config/core.js').load('$prefix/npmrc', {}, function (er, config) { console.log(config.get('prefix')) })"

output.csv