* Andi Kleen <[email protected]> wrote:
> > The 'price' paid for it is lower resolution - but it's still good
> > for those benchmarking TPC-C runs - and /alot/ simpler. It's also
> > quite a bit faster than any TSC based vgettimeofday, because it
> > doesnt have to do an RDTSC (or RDTSCP) instruction nor any
> > approximation of the time.
>
> I believe that should be also a separate clock_gettime() CLOCK_
>
> Global settings for these things are bad. Even if you run TPC-C you
> don't want your other programs that rely on monotonic time to break.
yeah. But maybe still there should still be an 'easy' option for people
to consciously degrade the resolution of gettimeofday(), in exchange for
more performance. There are systems where gettimeofday already has such
resolution, so apps certainly shouldnt break from this. But i agree with
you: that's why i made this default-off, and the CLOCK_ option could be
a way for apps to reliably get this behavior, independently of the
global setting (hence driving the migration of affected apps to this new
CLOCK_ thing). Hm?
Ingo
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