Adding benchmark

Author: lemire

benchmark/README.md

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+Performance benchmarks
+===
+
+You should have node.js and npm installed to run
+these benchmarks. It assumes a recent version of node.js (4.0.0 or better).
+
+npm install benchmark
+npm install sizeof
+npm install fastintcompression
+nodejs test.js

benchmark/test.js

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+/* performance benchmark */
+/* This script expects node.js */
+
+'use strict';
+var FastIntegerCompression = require('../FastIntegerCompression.js');
+var os = require('os');
+var Benchmark = require('benchmark');
+var sizeof=require("sizeof");
+
+function BasicBench() {
+    var array = [];
+    var howmany = 1000;
+    for (var i = 0, t = 40; i < howmany; i++) {
+        array.push(Math.round(Math.random() * t))
+    }
+    var buf = FastIntegerCompression.compress(array);
+    console.log('input size: '+sizeof.format(sizeof.sizeof(array))+' compressed size: '+sizeof.format(buf.byteLength));
+
+    var suite = new Benchmark.Suite();
+    var ms = suite.add('FastIntegerCompression.compress', function() {
+        return FastIntegerCompression.compress(array);
+    })
+    // add listeners
+    .on('cycle', function(event) {
+        console.log(String(event.target));
+    })
+    .on('complete', function() {
+        console.log('Fastest is ' + this.filter('fastest').pluck('name'));
+    })
+    // run async
+    .run({
+'async': false
+    });
+    suite = new Benchmark.Suite();
+    var ms = suite.add('FastIntegerCompression.uncompress', function() {
+        return FastIntegerCompression.uncompress(buf);
+    })
+    // add listeners
+    .on('cycle', function(event) {
+        console.log(String(event.target));
+    })
+    .on('complete', function() {
+        console.log('Fastest is ' + this.filter('fastest').pluck('name'));
+    })
+    // run async
+    .run({
+'async': false
+    });
+}
+
+var main = function() {
+    console.log('Platform: ' + process.platform + ' ' + os.release() + ' ' + process.arch);
+    console.log(os.cpus()[0]['model']);
+    console.log('Node version ' + process.versions.node + ', v8 version ' + process.versions.v8);
+    console.log();
+    BasicBench();
+    console.log('');
+};
+
+if (require.main === module) {
+    main();
+}