I got two result sets. Weird.
If I start up JPT and paste in the J code then hit enter I get a different
result then if I run a script from a project.
NB. cut and paste
x=: 1e6 $ ' '
y=: a. {~ ? 1e6 $ 256
%/ 100 (6!:2)&> '/:~x' ; '/:~y'
1.2642
x=: 1e6 $ ' '
y=: a. {~ ? 1e6 $ 256
%/ 100 (6!:2)&> '/:~x' ; '/:~y'
1.06437
x=: 1e6 $ ' '
y=: a. {~ ? 1e6 $ 256
%/ 100 (6!:2)&> '/:~x' ; '/:~y'
1.06393
x=: 1e6 $ ' '
y=: a. {~ ? 1e6 $ 256
%/ 100 (6!:2)&> '/:~x' ; '/:~y'
1.06667
NB. open project and run script
x=: 1e6 $ ' '
y=: a. {~ ? 1e6 $ 256
%/ 100 (6!:2)&> '/:~x' ; '/:~y'
2.92326
x=: 1e6 $ ' '
y=: a. {~ ? 1e6 $ 256
%/ 100 (6!:2)&> '/:~x' ; '/:~y'
2.99254
On Fri, Jul 4, 2014 at 10:59 PM, Roger Hui <[email protected]>
wrote:
> I have observed a puzzling timing result which may be CPU dependent.
> Please try the following and tell me what ratio you get, and the kind of
> machine you ran it on. Thanks.
>
> On my machine, an XPS L521X Intel Core i7-3632QM @ 2.2 GHz,
>
> x=: 1e6 $ ' '
> y=: a. {~ ? 1e6 $ 256
> %/ 100 (6!:2)&> '/:~x' ; '/:~y'
> 2.44133
>
> Basically, sorting a constant vector of 1-byte ints takes 2.4 times as long
> as sorting a random vector of 1-byte ints.
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>
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