x=: 1e6 $ ' '
y=: a. {~ ? 1e6 $ 256
%/ 100 (6!:2)&> '/:~x' ; '/:~y'
1.01978
%/ 100 (6!:2)&> '/:~x' ; '/:~y'
1.02001
%/ 100 (6!:2)&> '/:~x' ; '/:~y'
1.01747
Arch Linux. AMD Athlon II X4 640 3 GHz.
On 2014-07-08 22:11, Danylo Lizanets wrote:
x=: 1e6 $ ' '
y=: a. {~ ? 1e6 $ 256
%/ 100 (6!:2)&> '/:~x' ; '/:~y'
2.07821
64-bit Ubuntu Linux, Intel Core i5-2450M
On Tue, Jul 8, 2014 at 2:30 AM, Nollaig MacKenzie <[email protected]
wrote:
Intense PC (64 bit Intel core i7) j701/2011-01-10/11:25
1.43 - 1.45
Mac Mini OS X 10.9.3
1.11 - 1.18
On 2014.07.04 22:59:29, you,
the extraordinary Roger Hui, spake thus:
From: Roger Hui <[email protected]>
Subject: [Jprogramming] sort times
Date: Fri, 4 Jul 2014 22:59:29 -0700
To: Programming forum <[email protected]>
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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--
Nollaig MacKenzie
http://www.yorku.ca/nollaig
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For information about J forums see http://www.jsoftware.com/forums.htm
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