更新 1：@BagosGiAr 使用非常相似的配置进行的测试表明集群总是应该表现得更好。也就是说，我的配置有问题，我请你帮我找出可能的问题。
更新 2：我想深入研究这个问题。我已经在 LiveCD* (Xubuntu 13.04) 上进行了测试，相同的节点版本。首先，Linux 的性能比 Windows 好得多：-n 100000 -c 1000没有集群时为我 6409.85 reqs/sec，集群时为 7215.74 reqs/sec。Windows build 肯定有很多问题。我仍然想调查为什么这种情况只发生在我身上，因为一些具有类似配置的人表现更好（并且集群也表现良好）。
*应该注意的是，LiveCD 使用 RAM 文件系统，而在 Windows 中我使用的是快速 SSD。
这怎么可能？cluster模块的结果不应该更好吗？规格：Windows 7 x64，双核 P8700 2.53Ghz，4GB RAM，Node.js 0.10.5，ab 2.3。测试命令行是ab -n 10000 -c 1000 http://127.0.0.1:8080/.
var http = require('http');
http.createServer(function (req, res) {
res.end('Hello World');
}).listen(8080);
基准测试结果 ~ 2840.75 reqs/second：
This is ApacheBench, Version 2.3 <$Revision: 1430300 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/
Benchmarking 127.0.0.1 (be patient)
Server Software:
Server Hostname: 127.0.0.1
Server Port: 8080
Document Path: /
Document Length: 12 bytes
Concurrency Level: 1000
Time taken for tests: 3.520 seconds
Complete requests: 10000
Failed requests: 0
Write errors: 0
Total transferred: 870000 bytes
HTML transferred: 120000 bytes
Requests per second: 2840.75 [#/sec] (mean)
Time per request: 352.020 [ms] (mean)
Time per request: 0.352 [ms] (mean, across all concurrent requests)
Transfer rate: 241.35 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 0 7.1 0 505
Processing: 61 296 215.9 245 1262
Waiting: 31 217 216.7 174 1224
Total: 61 297 216.1 245 1262
Percentage of the requests served within a certain time (ms)
50% 245
66% 253
75% 257
80% 265
90% 281
95% 772
98% 1245
99% 1252
100% 1262 (longest request)
使用集群模块：
var cluster = require('cluster'),
http = require('http'),
numCPUs = require('os').cpus().length;
if (cluster.isMaster) {
// Fork workers
for (var i = 0; i < numCPUs; i++) {
cluster.fork();
}
cluster.on('exit', function (worker, code, signal) {
console.log('worker ' + worder.process.pid + ' died');
});
} else {
http.createServer(function (req, res) {
res.end('Hello World');
}).listen(8080);
}
...并且使用相同的基准，结果最差：849.64 reqs/sec：
This is ApacheBench, Version 2.3 <$Revision: 1430300 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/
Benchmarking 127.0.0.1 (be patient)
Server Software:
Server Hostname: 127.0.0.1
Server Port: 8080
Document Path: /
Document Length: 12 bytes
Concurrency Level: 1000
Time taken for tests: 11.770 seconds
Complete requests: 10000
Failed requests: 0
Write errors: 0
Total transferred: 870000 bytes
HTML transferred: 120000 bytes
Requests per second: 849.64 [#/sec] (mean)
Time per request: 1176.967 [ms] (mean)
Time per request: 1.177 [ms] (mean, across all concurrent requests)
Transfer rate: 72.19 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 1 21.3 0 509
Processing: 42 1085 362.4 1243 2274
Waiting: 27 685 409.8 673 1734
Total: 42 1086 362.7 1243 2275
Percentage of the requests served within a certain time (ms)
50% 1243
66% 1275
75% 1286
80% 1290
90% 1334
95% 1759
98% 1772
99% 1787
100% 2275 (longest request)