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Re: IDL and Macs. Speed is not only about squared roots [message #49297 is a reply to message #49295]

Fri, 14 July 2006 07:18

Maarten[1]
Messages: 176
Registered: November 2005

Senior Member

jgc wrote:
>> Given the fact that you didn't use the real native thing, I think
>> you're jumping to conclusions.
>
> WHO is jumping to conclusions??
>
> You fail to read properly my email.

I doubt it, I just re-read it. Here is the important bit from your
message:

> One summer simulation took 22 minutes on IDL 6.0 in the windows PC 1.4
> GHz and 42 minutes on the Mac Intel 2.16 GHz with IDL 6.2.

> From the ITTVIS/RSI/IDL production or marketing department, the message
was:

> "I am pleased to announce the release of IDL 6.3 for Mac OS X on Intel.
> This new IDL release runs as a native application on all Mac Intel
> supported machines and offers significant performance benefits. [. . .]"

Yes, any IDL version for Mac OS X /before/ IDL 6.3 is a PowerPC only
application, and your message clearly states that you used version 6.2
on Mac Intel. This is a version that runs under Rosetta (an emulated
PowerPC). This extra overhead causes a slowdown. Mind you, for
emulation it is impressively fast.

> I will re-explain myself:
>
> PC windows is slower than Mac in simple operations and even in
> repetitive more complex operations

And this is no surprise, and was in fact known for IDL version 6.2,
especially on a Mac Intel machine.

> On a long complex program the same PCW outperforms Macs. Therefore is
> obvious that macs are wasting time on other grounds. Where? that was
> my question.

In Rosetta. IDL 6.2 for Mac OS X is not compiled for an Intel
processor.

> what conclusions am I jumping to, I would like to know.

That 6.2 should run as fast as a Windows/Linux version on Intel
processors. It isn't expected to do that. 6.3 for Mac OS X/Intel should
change that. Test on that version, and report again.

The other remark remains: use a profiler to figure out where your
bottlenckes live.

Maarten

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[Message index]

		Re: IDL and Macs. Speed is not only about squared roots By: Karl Schultz on Fri, 14 July 2006 08:20
		Re: IDL and Macs. Speed is not only about squared roots By: Maarten[1] on Fri, 14 July 2006 07:18
		Re: IDL and Macs. Speed is not only about squared roots By: jgc on Fri, 14 July 2006 06:26
		Re: IDL and Macs. Speed is not only about squared roots By: jgc on Fri, 14 July 2006 06:02
		Re: IDL and Macs. Speed is not only about squared roots By: Maarten[1] on Fri, 14 July 2006 04:37

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