Performance test for new Error() on node.js

stress.js

var path       = require('path');
var filename   = path.basename(path.normalize(__filename))

// Install deps:
// $> npm install log4js
// $> npm install node-lumberjack
//
// Run as:
// $> time node stress.js > /dev/null

function stress_log(log) {
    var i;
    for (i = 0; i < 100000; ++i) {
        log.info("Counter Value = %s", i);
    }
}

function test_node_lumberjack() {
    var lumberjack = require('node-lumberjack')
    var log = lumberjack.getLogger(filename, 'info');
    stress_log(log);
}

function test_log4js() {
    var log4js = require("log4js");

    log4js.configure({
        doNotReplaceConsole: true
    });

    var appender = log4js.consoleAppender(log4js.basicLayout);
    log4js.clearAppenders();
    log4js.addAppender(appender);
    log4js.setGlobalLogLevel("INFO");

    var log = log4js.getLogger(filename);
    stress_log(log);
}

// Comment out one or the other to test the running time.
test_node_lumberjack();
// test_log4js();

// I see 15sec for node-lumberjack and 3sec for log4js which is a 5x difference.
// If I remove the new Error().stack bit from node-lumberjack, the running time is 3sec (similar to log4js)
// So, the overhead of doing a new Error() is pretty high.