From d0c96481bfdd43178554829e1dcd7916cc581b06 Mon Sep 17 00:00:00 2001 From: David Majda Date: Sat, 3 Sep 2011 17:40:26 +0200 Subject: [PATCH] Add /tools/impact script to measure speed and size impact of commits --- tools/impact | 109 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 109 insertions(+) create mode 100755 tools/impact diff --git a/tools/impact b/tools/impact new file mode 100755 index 0000000..f7d5bdf --- /dev/null +++ b/tools/impact @@ -0,0 +1,109 @@ +#!/bin/sh + +# Measures impact of a Git commit (or multiple commits) on generated parsers' +# speed and size. Makes sense to use only on PEG.js Git repository checkout. + +set -e + +# Measurement + +prepare() { + git checkout --quiet "$1" + jake build +} + +measure_speed() { + echo $(jake benchmark | awk 'BEGIN { FS = " *│ *" } /Total/ { split($5, a, " "); print a[1] }') +} + +measure_size() { + for file in examples/*.pegjs; do + bin/pegjs "$file" + done + + echo $(cat examples/*.js | wc -c) + + rm examples/*.js +} + +difference() { + bc <<-EOT + scale = 4 + ($2 / $1 - 1) * 100 +EOT +} + +# Helpers + +print_results() { + echo + + echo "Speed impact" + echo "------------" + echo "Before: $1 kB/s" + echo "After: $2 kB/s" + printf "Difference: %0.2f%%\n" $(difference $1 $2) + + echo + + echo "Size impact" + echo "-----------" + echo "Before: $3 b" + echo "After: $4 b" + printf "Difference: %0.2f%%\n" $(difference $3 $4) + + echo + + echo "(Measured by /tools/impact with Node.js $(node --version) on $(uname --operating-system --machine).)" +} + +print_usage() { + echo "Usage:" + echo " $0 " + echo " $0 " + echo + echo "Measures impact of a Git commit (or multiple commits) on generated parsers'" + echo "speed and size. Makes sense to use only on PEG.js Git repository checkout." +} + +cd_to_root() { + if [ -L "$0" ]; then + THIS_FILE=$(readlink "$0") + else + THIS_FILE="$0" + fi + cd "$(dirname "$THIS_FILE")/.." +} + +exit_failure() { + exit 1 +} + +# Main + +if [ $# -eq 1 ]; then + commit_before="$1~1" + commit_after="$1" +elif [ $# -eq 2 ]; then + commit_before="$1" + commit_after="$2" +else + print_usage + exit_failure +fi + +cd_to_root + +echo -n "Measuring commit $commit_before..." +prepare "$commit_before" +speed1=$(measure_speed) +size1=$(measure_size) +echo " OK" + +echo -n "Measuring commit $commit_after..." +prepare "$commit_after" +speed2=$(measure_speed) +size2=$(measure_size) +echo " OK" + +print_results $speed1 $speed2 $size1 $size2