Hi Dave,
Good hearing from you and glad to see the new perf numbers!
Ok folks, we have 27x here, who has better? :-)
Please don't hesitate to post your stories, we might ask your permission
later on to publish them on our developer web site!
X
Le 10/13/04 2:52 PM, Dave Thorup at email@hidden wrote:
> On Oct 13, 2004, at 1:37 PM, Xavier wrote:
>
>> Dear Developer,
>>
>> Welcome to the Performance Optimization mailing list, and what better
>> way to welcome you than to announce a new release of Shark!
>
> Xavier,
>
> Thanks for the welcome and the new release of the CHUD tools. I've
> been using the 4.0 betas and it is a great improvement over 3.x. Let
> me also say thank you Apple for providing this list. I think that it
> will be a great developer resource.
>
> I'd like to share a quick Shark's tale. I was recently given the task
> of optimizing some code (that wasn't mine) and the first thing I did
> (the first thing anyone should do) was run it through Shark. Shark
> quickly told me right where the slowdown was. It turned out to be a
> horribly inefficient table lookup. Rather than using some kind of
> hashtable or tree, the lookup was doing a linear search over about 4000
> elements.
>
> I changed the implementation to use a highly optimized hashtable and
> the results were great. It's now about 27x faster on a DP 800MHz G4
> and about 37x faster on a DP 2.0GHz G5. Shark led me right to the
> hotspot and helped me recognize why the algorithm was so slow.
>
> To everyone out there, if you're not using Shark, what are you waiting
> for? Shark is by far the best and easiest way to figure out where your
> performance bottlenecks are.
> _____________________________
>
> Dave Thorup
> Mac Software Engineer
> email@hidden
>
> Nikon Inc., Imaging Division
> www.nikonusa.com
>
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