When looking at the linux pid hash table it is clearly tuned
to a small number of processes < 4096.   If there are more then
that it starts to degrade with a worst case of 1024 entries
on each hash chain when pid_max is pushed up to 4*1024*1024.

If more process ids are common then it may be the case that
we need to fix that data structure so it scales more gracefully.

Eric


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