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117 lines
2.1 KiB
Bash
117 lines
2.1 KiB
Bash
#!/bin/sh
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# Measures impact of a Git commit (or multiple commits) on generated parsers'
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# speed and size. Makes sense to use only on PEG.js Git repository checkout.
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set -e
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export LC_ALL=C
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# Measurement
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prepare() {
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git checkout --quiet "$1"
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}
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run_benchmark() {
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echo $(gulp benchmark | awk 'BEGIN { FS = " *│ *" } /Total/ { split($5, a, " "); print a[1] }')
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}
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measure_speed() {
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bc <<-EOT
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scale = 2
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($(run_benchmark) + $(run_benchmark) + $(run_benchmark) + $(run_benchmark) + $(run_benchmark)) / 5
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EOT
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}
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measure_size() {
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for file in examples/*.pegjs; do
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bin/pegjs "$file"
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done
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echo $(cat examples/*.js | wc -c)
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rm examples/*.js
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}
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difference() {
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bc <<-EOT
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scale = 4
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($2 / $1 - 1) * 100
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EOT
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}
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# Helpers
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print_results() {
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echo
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echo "Speed impact"
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echo "------------"
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echo "Before: $1 kB/s"
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echo "After: $2 kB/s"
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printf "Difference: %0.2f%%\n" $(difference $1 $2)
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echo
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echo "Size impact"
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echo "-----------"
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echo "Before: $3 b"
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echo "After: $4 b"
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printf "Difference: %0.2f%%\n" $(difference $3 $4)
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echo
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echo "(Measured by /tools/impact with Node.js $(node --version) on $(uname -mrs).)"
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}
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print_usage() {
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echo "Usage:"
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echo " $0 <commit>"
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echo " $0 <commit_before> <commit_after>"
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echo
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echo "Measures impact of a Git commit (or multiple commits) on generated parsers'"
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echo "speed and size. Makes sense to use only on PEG.js Git repository checkout."
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}
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cd_to_root() {
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if [ -L "$0" ]; then
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THIS_FILE=$(readlink "$0")
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else
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THIS_FILE="$0"
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fi
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cd "$(dirname "$THIS_FILE")/.."
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}
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exit_failure() {
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exit 1
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}
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# Main
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if [ $# -eq 1 ]; then
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commit_before="$1~1"
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commit_after="$1"
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elif [ $# -eq 2 ]; then
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commit_before="$1"
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commit_after="$2"
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else
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print_usage
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exit_failure
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fi
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cd_to_root
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printf "Measuring commit %s..." "$commit_before"
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prepare "$commit_before"
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speed1=$(measure_speed)
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size1=$(measure_size)
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echo " OK"
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printf "Measuring commit %s..." "$commit_after"
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prepare "$commit_after"
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speed2=$(measure_speed)
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size2=$(measure_size)
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echo " OK"
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print_results $speed1 $speed2 $size1 $size2
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