Messages in this thread | | | Date | Tue, 05 Mar 2002 21:20:25 -0700 | From | Ben Greear <> | Subject | Re: a faster way to gettimeofday? |
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Davide Libenzi wrote:
> On Tue, 5 Mar 2002, Ben Greear wrote: > > >>I have a program that I very often need to calculate the current >>time, with milisecond accuracy. I've been using gettimeofday(), >>but gprof shows it's taking a significant (10% or so) amount of >>time. Is there a faster (and perhaps less portable?) way to get >>the time information on x86? My program runs as root, so should >>have any permissions it needs to use some backdoor hack if that >>helps! >> > > If you're on x86 you can use collect rdtsc samples and convert them to ms. > You'll get even more then ms accuracy.
Can I do this from user space? If so, any examples or docs you can point me to?
Also, I'm looking primarily for a speed increase, not an accuracy increase.
Thanks for the response!
Ben
> > > > > - Davide > > > > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > >
-- Ben Greear <greearb@candelatech.com> <Ben_Greear AT excite.com> President of Candela Technologies Inc http://www.candelatech.com ScryMUD: http://scry.wanfear.com http://scry.wanfear.com/~greear
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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