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#!/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
export LC_ALL=C
# Measurement
prepare() {
git checkout --quiet "$1"
}
run_benchmark() {
echo $(gulp benchmark | awk 'BEGIN { FS = " *│ *" } /Total/ { split($5, a, " "); print a[1] }')
}
measure_speed() {
bc <<-EOT
scale = 2
($(run_benchmark) + $(run_benchmark) + $(run_benchmark) + $(run_benchmark) + $(run_benchmark)) / 5
EOT
}
measure_size() {
for file in examples/*.pegjs; do
bin/pegjs "$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 -mrs).)"
}
print_usage() {
echo "Usage:"
echo " $0 <commit>"
echo " $0 <commit_before> <commit_after>"
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="$2"
else
print_usage
exit_failure
fi
cd_to_root
printf "Measuring commit %s..." "$commit_before"
prepare "$commit_before"
speed1=$(measure_speed)
size1=$(measure_size)
echo " OK"
printf "Measuring commit %s..." "$commit_after"
prepare "$commit_after"
speed2=$(measure_speed)
size2=$(measure_size)
echo " OK"
print_results $speed1 $speed2 $size1 $size2