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190 lines
3.9 KiB
JavaScript
190 lines
3.9 KiB
JavaScript
//
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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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//
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/* eslint-disable no-mixed-operators, prefer-const */
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"use strict";
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const child_process = require( "child_process" );
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const fs = require( "fs" );
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const os = require( "os" );
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const path = require( "path" );
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const dedent = require( "dedent" );
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const glob = require( "glob" );
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// Current Working Directory
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const cwd = path.join( __dirname, "..", ".." );
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if ( process.cwd() !== cwd ) process.chdir( cwd );
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// Execution Files
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function binfile( ...files ) {
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for ( const file of files ) {
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if ( fs.existsSync( file ) ) return file;
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}
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throw `Could not find: ${ files.join( " || " ) }`;
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}
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const PEGJS_BIN = binfile( "packages/pegjs/bin/peg.js", "bin/peg.js", "bin/pegjs" );
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const BENCHMARK_BIN = binfile( "tools/benchmark/node.js", "test/benchmark/run", "benchmark/run" );
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// Utils
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function echo( message ) {
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process.stdout.write( message );
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}
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function print_empty_line() {
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console.log( " " );
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}
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function exec( command ) {
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return child_process.execSync( command, { encoding: "utf8" } );
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}
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function prepare( commit ) {
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exec( `git checkout --quiet "${ commit }"` );
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}
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function runBenchmark() {
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return parseFloat(
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exec( "node " + BENCHMARK_BIN )
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// Split by table seprator, reverse and return the total bytes per second
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.split( "│" )
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.reverse()[ 1 ]
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// Trim the whitespaces and remove ` kB/s` from the end
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.trim()
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.slice( 0, -5 )
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);
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}
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function measureSpeed() {
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return ( runBenchmark() + runBenchmark() + runBenchmark() + runBenchmark() + runBenchmark() / 5 ).toFixed( 2 );
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}
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function measureSize() {
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let size = 0;
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glob.sync( "examples/*.pegjs" )
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.forEach( example => {
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exec( `node ${ PEGJS_BIN } ${ example }` );
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example = example.slice( 0, -5 ) + "js";
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size += fs.statSync( example ).size;
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fs.unlinkSync( example );
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} );
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return size;
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}
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function difference( $1, $2 ) {
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return ( ( $2 / $1 - 1 ) * 100 ).toFixed( 4 );
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}
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// Prepare
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const argv = process.argv.slice( 2 );
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let commit_before, commit_after;
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if ( argv.length === 1 ) {
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commit_before = argv[ 0 ] + "~1";
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commit_after = argv[ 0 ];
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} else if ( argv.length === 2 ) {
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commit_before = argv[ 0 ];
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commit_after = argv[ 1 ];
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} else {
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print_empty_line();
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console.log( dedent`
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Usage:
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node tools/impact <commit>
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node tools/impact <commit_before> <commit_after>
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Measures impact of a Git commit (or multiple commits) on generated parser's
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speed and size. Makes sense to use only on PEG.js Git repository checkout.
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` );
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print_empty_line();
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process.exit( 1 );
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}
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// Measure
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const branch = exec( "git rev-parse --abbrev-ref HEAD" );
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let speed1, size1, speed2, size2;
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print_empty_line();
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echo( `Measuring commit ${ commit_before }...` );
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prepare( commit_before );
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speed1 = measureSpeed();
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size1 = measureSize();
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echo( " done." + os.EOL );
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echo( `Measuring commit ${ commit_after }...` );
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prepare( commit_after );
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speed2 = measureSpeed();
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size2 = measureSize();
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echo( " done." + os.EOL );
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// Finish
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prepare( branch );
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print_empty_line();
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console.log( dedent`
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node tools/impact ${ commit_before } ${ commit_after }
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Speed impact
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------------
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Before: ${ speed1 } kB/s
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After: ${ speed2 } kB/s
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Difference: ${ difference( parseFloat( speed1 ), parseFloat( speed2 ) ) }%
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Size impact
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-----------
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Before: ${ size1 } b
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After: ${ size2 } b
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Difference: ${ difference( size1, size2 ) }%
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- Measured by /tools/impact with Node.js ${ process.version }
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- Your system: ${ os.type() } ${ os.release() } ${ os.arch() }.
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` );
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print_empty_line();
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