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seen Oct 20 '14 at 21:15
I am a Perl programmer using Java by day. I am jdavidb on use.perl.org and slashdot.

comment Where does Mac OS X come from?
It was my understanding that the main reason Stallman at FSF pursued Mach was not performance but ease of using a debugger: he could use the debugger to debug Mach servers far more easily than debugging code running in kernel space. Although maybe it was the performance that convinced him this was a viable way to implement.