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Interesting, my problems back then were actually ZMQ-related.

Though to be fair, we were making it a bit complicated by suspending/resuming the OpenVZ containers. From that we sometimes got dead ZMQ connections that were black holing all traffic (incredibly hard to debug - ended up switching because of it).

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Yes, most of my crashes on the mongrel2 server I run come from ZeroMQ too. They fix them when I find them, but I actually run my servers under valgrind continually so I can catch them and report them.

OpenVZ is tricky, they are patching the kernel pretty deep and this creates a lot of hard to debug issues. I had a lot of troubles with containers running software mapping big files like MongoDB.

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