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Is there a way to find out the current number of connection attempts awaiting accept() on a TCP socket on Linux? I suppose I could count the number of accepts() that succeed before hitting EWOULDBLOCK on each event loop, but I'm using a high-level library (Python/Twisted) that hides these details. Also it's using epoll() rather than an old-fashioned select()/poll() loop. I am trying to get a general sense of the load on a high-performance non-blocking network server, and I think this number would be a good characterization. Load average/CPU statistics aren't helping much, because I'm doing a lot of disk I/O in concurrent worker processes. Most of these stats on Linux count time spent waiting on disk I/O as part of the load (which it isn't, for my particular server architecture). Latency between accept() and response isn't a good measure either, since each request usually gets processed very quickly once the server gets around to it. I'm just trying to find out how close I am to reaching a breaking point where the server can't dispatch requests faster than they are coming in.

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