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Re: Linux Help Needed [message #47242 is a reply to message #47153]

Fri, 27 January 2006 17:55

JD Smith
Messages: 850
Registered: December 1999

Senior Member

On Fri, 27 Jan 2006 19:47:53 +0000, Greg Hennessy wrote:

> On 2006-01-27, Nigel Wade <nmw@ion.le.ac.uk> wrote:
>> It seems that the Intel Macs are not all that Apple would like you to believe:
>>
>> http://www.macworld.com/2006/01/features/imaclabtest1/index. php
>
> Not that I have a dog in this fight, since I use Linux on opterons,
> but a different viewpoint can be found at:
>
> http://www.macspeedzone.com/html/hardware/machine/performanc e_in_the_raw/06/1_23.shtml

My strong impression is that, for large arrays (say 200,000 elements
and more), the MacBook should be around 4-5 times faster at basic
processing in IDL (not reading/writing to disk, drawing to screen,
etc, but FFT's, arithmetic, etc.) than the Powerbook G4's they
replace. In fact I'd be willing to make a wager to this effect.

Each core of the Core Duo is about as fast as a G5. If you are
hammering away at both cores, you'll really embarrass your old PB. I
expect *very* similar performance for Linux laptops with the Core Duo
and the MacBook: same compiler, very similar libraries, same
processor, same memory sub-system, etc. Macs may lag a bit due to the
extra overhead of function calls, but it should be close. It will be nice
not to suffer the "PPC" penalty under IDL (though we lament the unrealized
potential which was Altivec).

Macworld's test was something of a joke. Though useful, because it
reflects real world typical-use performance, we could easily design
benchmarks in IDL which actually stress the dual CPU cores to their
maximum, and we would find much different results. Here's a hint. This
is not a CPU benchmark:

IDL> openw,un,/get_lun & writeu,un,lindgen(10000000L) & free_lun,un

JD

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[Message index]

		Linux Help Needed By: David Fanning on Mon, 23 January 2006 20:17
		Re: Linux Help Needed By: David Fanning on Fri, 27 January 2006 14:00
		Re: Linux Help Needed By: swisswuff on Sat, 28 January 2006 09:51
		Re: Linux Help Needed By: jeyadev on Fri, 27 January 2006 15:17
		Re: Linux Help Needed By: jeyadev on Fri, 27 January 2006 13:22
		Re: Linux Help Needed By: savoie on Fri, 27 January 2006 12:18
		Re: Linux Help Needed By: Michael Wallace on Fri, 27 January 2006 12:05
		Re: Linux Help Needed By: Greg Hennessy on Fri, 27 January 2006 11:47
		Re: Linux Help Needed By: JD Smith on Fri, 27 January 2006 17:55
		Re: Linux Help Needed By: Benjamin Hornberger on Fri, 27 January 2006 11:35
		Re: Linux Help Needed By: Michael Wallace on Fri, 27 January 2006 11:03
		Re: Linux Help Needed By: David Fanning on Fri, 27 January 2006 09:58
		Re: Linux Help Needed By: Karl Schultz on Fri, 27 January 2006 09:19
		Re: Linux Help Needed By: Ken Mankoff on Fri, 27 January 2006 07:50
		Re: Linux Help Needed By: K. Bowman on Fri, 27 January 2006 07:27
		Re: Linux Help Needed By: Nigel Wade on Fri, 27 January 2006 01:45
		Re: Linux Help Needed By: K. Bowman on Thu, 26 January 2006 12:57
		Re: Linux Help Needed By: David Fanning on Thu, 26 January 2006 11:22
		Re: Linux Help Needed By: JD Smith on Fri, 27 January 2006 17:32
		Re: Linux Help Needed By: Sid[1] on Thu, 26 January 2006 11:12
		Re: Linux Help Needed By: Foldy Lajos on Sat, 28 January 2006 02:00
		Re: Linux Help Needed By: Paul Van Delst[1] on Fri, 27 January 2006 18:25

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