See comment below code. For some reason a linux server that should be 2x faster than windows laptop..is slightly slower

telemetry-node.js

var http = require('http');
var fs = require('fs');

function fail(request, response, msg) {
	response.writeHead(413, {'Content-Type': 'text/plain'});
	response.end(msg);
}

function postRequest(request, response, callback) {
    var queryData = "";

    if(request.method == 'POST') {
        request.on('data', function(data) {
            queryData += data;
			// drop data > 200K
            if(queryData.length > 200*1024) {
				fail(request, response, ""+queryData.length + "bytes -> too big of a request");
				queryData = "";
            }
        });

        request.on('end', function() {
            fs.appendFile('log.txt', queryData, function (err) {
				if (err) {
					fail(request, response, err);
				}
				callback();
			});
        });

    } else {
		fail(request, response, "Wrong request type");
        response.writeHead(405, {'Content-Type': 'text/plain'});
        response.end();
    }
}

function run_server(port) {
	// Workers can share any TCP connection
	// In this case its a HTTP server
	http.createServer(function(request, response) {
		postRequest(request, response, function() {
			response.writeHead(200, {'Content-Type': 'text/plain'});
			response.end('OK');	
		});
	}).listen(port);
	console.log("Listening on port "+port);
}
var cluster = require('cluster');
var numCPUs = require('os').cpus().length;

if (cluster.isMaster) {
	// Fork workers.
	for (var i = 0; i < numCPUs; i++) {
		cluster.fork();
	}

	cluster.on('exit', function(worker, code, signal) {
		console.log('worker ' + worker.process.pid + ' died');
	});
} else {
	run_server(8000);
}

/*windows dualcore laptop benching quadcore server:
$ ./ab -c600  -k -t 5 -n 900000 -p 30K  http://quad.:8000/                                                                                                                                                                                                                        This is ApacheBench, Version 2.3 <$Revision: 1430300 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking quad. (be patient)


Server Software:
Server Hostname:        quad.
Server Port:            8000

Document Path:          /
Document Length:        2 bytes

Concurrency Level:      600
Time taken for tests:   5.140 seconds
Complete requests:      5988
Failed requests:        0
Write errors:           0
Keep-Alive requests:    0
Total transferred:      617794 bytes
Total body sent:        198641376
HTML transferred:       11996 bytes
Requests per second:    1164.88 [#/sec] (mean)
Time per request:       515.076 [ms] (mean)
Time per request:       0.858 [ms] (mean, across all concurrent requests)
Transfer rate:          117.37 [Kbytes/sec] received
                        37737.03 kb/s sent
                        37854.39 kb/s total

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    1   0.6      1      17
Processing:   370  473  68.4    467     660
Waiting:        6  238 137.0    236     638
Total:        370  473  68.4    467     661

Percentage of the requests served within a certain time (ms)
  50%    467
  66%    476
  75%    489
  80%    497
  90%    587
  95%    640
  98%    653
  99%    658
 100%    661 (longest request)
Finished 5988 requests

quadcore server benching node..EG WINDOWS being faster at being server on slower hw...wtf
taras@quad:~/tmp$ ab -c600  -k -t 10 -n 900000 -p 30K  http://xps13.:8000/
This is ApacheBench, Version 2.3 <$Revision: 1430300 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking xps13. (be patient)
Finished 12149 requests


Server Software:
Server Hostname:        xps13.
Server Port:            8000

Document Path:          /
Document Length:        2 bytes

Concurrency Level:      600
Time taken for tests:   10.345 seconds
Complete requests:      12149
Failed requests:        0
Write errors:           0
Keep-Alive requests:    0
Total transferred:      1254849 bytes
Total body sent:        384330138
HTML transferred:       24366 bytes
Requests per second:    1174.33 [#/sec] (mean)
Time per request:       510.931 [ms] (mean)
Time per request:       0.852 [ms] (mean, across all concurrent requests)
Transfer rate:          118.45 [Kbytes/sec] received
                        36278.82 kb/s sent
                        36397.27 kb/s total

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        9  256 117.3    255     485
Processing:    12  231 120.0    230     503
Waiting:        6  223 119.3    222     493
Total:        339  487  78.3    482     949

Percentage of the requests served within a certain time (ms)
  50%    482
  66%    487
  75%    488
  80%    493
  90%    501
  95%    505
  98%    835
  99%    873
 100%    949 (longest request)
*/

1, 2 Good point

1. utf8 does make this a mess, thanks for spotting the footgun. Not encoding into utf8 is not well documented since the 'binary' encoding is deprecated