Fairly obvious if you look at it. FreeBSD favours continuing to schedule
the parent, Linux favours scheduling the child initially. So the Linux
one has a set of processes getting CPU time to execute the busy loops.
The normal case is
fork
exec
or
fork
child:
something short
[sleep or exit]
So the Linux behaviour is a win except in your carefully constructed
program.
Count the loops each of your child processes does.
Alan
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