Well that crash I caused is partially due to my own terrible error handling, and the fact that I didn't boost my ulimit for file descriptors (I am using a good bit of pipes in my process, but my per-user limit is ridiculously low!!!).
Upped the ulimit to 2048 from a pathetically low 256 and now I can get through a lot more prime numbers before barfing. (It's a laptop man! I'm the ONLY user...)
A rather big part of this is that I'm using pipes for communication between event sources, which fire off my blocks. There's exactly one pair of fd's for every prime I find, plus all the fds in use under my uname.
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