Hi, On Tue, Apr 10, 2012 at 4:05 PM, Mike Meyer <m...@mired.org> wrote: > On Tue, 10 Apr 2012 12:58:00 -0400 > Arnaud Lacombe <lacom...@gmail.com> wrote: >> Let me disagree on your conclusion. If OS A does a task in X seconds, >> and OS B does the same task in Y seconds, if Y > X, then OS B is just >> not performing good enough. > > Others have pointed out one problem with this statement. Let me point > out another: > > It ignores the purpose of the system. If you change the task to doing > N concurrent versions of the task, and OS A time increases linearly > with the number of tasks (say it's time X*N) but OS B stair-steps at > the number of processors in the system (i.e. Y*floor(N/P)), then OS A > is just not performing good enough. > > A more concrete example: if OS B spends a couple of microseconds > optimizing disk access order and OS A doesn't, then a single process > writing to disk on OS A could well run faster than the same on OS > B. However, the maximum throughput on OS B as you add process will be > higher than it is on OS A. Which one you want will depend on what > you're using the system for. > You are discussing implementations in both case. If the implementation is not good enough, let's improve it, but do not discard the numbers on false claims.
- Arnaud _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
