ulimit stack size and python threads

[Greg Lindahl]

> How much higher? You could try just under 4GB (unsigned 32-bit) and just
> under 2GB (signed 32-bit).

I'd like to set it to be about 1/2 the memory size of my server, which
happens to end up being 4 gbytes. And no, slightly less than 4 gb
doesn't work.

But even if that worked, I'd be worried that python is doing something
bad with the ulimit -s value under the covers.

-- greg