Hey,

I'm coding a proxy server checker.

In order to check a proxy, I need to connect to it using "request" module, 
and perform several requests.

The goal is to be able to check thousands of proxies in short amount of 
time.

I was hoping to test 1,000 proxies concurrently. I did the following 
configs:
http.globalAgent.maxSockets = 100000;
events.EventEmitter.prototype._maxListeners = 100000;

and I execute 1,000 requests using async.queue.

I also set the open file descriptors to a really high limit... Another 
thing I do is I set a timeout for each proxy for 30 secs...

Anyway, what happens is that the first requests are performed well and then 
I start getting a lot of ETIMEDOUT & ESOCKETTIMEDOUT.

I checked the amout of open files for my node process:
pidof node
lsof -p 3730 | grep TCP | wc -l

And I check it periodically during the execution. It looks like I always 
get stuck on average of 30 sockets. It seems like something is limiting my 
requests to work. And then, when a turn of a request comes, it simply 
refuses to work because it's already timedout.

Any suggestions?

Thanks.

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