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To apply the sysctl changes right away:

sudo sysctl -p /etc/sysctl.conf

My oldish kernel doesn't recognize the PID settings, which is unfortunate.

Wow, how old is that kernel? I've been using that since at least the 2.6.32 era.

I think I was on 2.6.38. Seems like it ought to work, but didn't. Dunno.