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Re: IDL i/o on G4 [message #24212 is a reply to message #24206]

Wed, 14 March 2001 21:40

dima
Messages: 5
Registered: November 1998

Junior Member

On Wed, 14 Mar 2001 20:14:58 -0500, JD Smith <jdsmith@astro.cornell.edu> wrote:
> "Dmitri A. Sergatskov" wrote:
>>
>> Looking at IDLSPEC2 numbers for Macs (G4 in particular), it appears that
>> I/O performance is abysmal. Does anyone have an insight why would it
>> be so bad? The STREAM benchmark suggests that it should not be a generic
>> G4/MacOS problem.
>>
>
...< Mac OS well, sucks ...>

> MacOSX, it would line up reasonably well with other OS's. I also
> imagine doing heavy duty I/O where your cache policy is irrelevant would
> equalize things (though I'd suspect the MacOS I/O subsytem would still
> suffer).
>
> One other thing to remember: the speed advantages of G4's Altivec unit
> are not built into the IDLSpec2 survey, since they were introduced in
> version 5.4.
>
... < benchmark can be improved ...>

Thanks for your reply!
Well, I guess I have to start from the beginning. I need to choose
a laptop for very memory intensive number crunching job (similar
job runs on intel LX mb / 66MHz bus approx 30% slower then
on BX / 100 MHz bus, the same CPU). There are number of reason
to get a latest Apple G4 notebook in favor of say IBM T21, but
this benchmark put me off for the moment. I guess it is back
for considerations now.

>
> JD

Regards,

Dmitri.

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[Message index]

		Re: IDL i/o on G4 By: dima on Thu, 15 March 2001 16:37
		Re: IDL i/o on G4 By: dirk on Thu, 15 March 2001 20:40
		Re: IDL i/o on G4 By: John-David T. Smith on Fri, 16 March 2001 08:48
		Re: IDL i/o on G4 By: John-David T. Smith on Thu, 15 March 2001 15:40
		Re: IDL i/o on G4 By: dima on Thu, 15 March 2001 12:18
		Re: IDL i/o on G4 By: John-David T. Smith on Thu, 15 March 2001 09:47
		Re: IDL i/o on G4 By: dima on Wed, 14 March 2001 21:40
		Re: IDL i/o on G4 By: John-David T. Smith on Wed, 14 March 2001 17:14
		Mac OS X (was: IDL i/o on G4) By: Paul Woodford on Thu, 22 March 2001 20:01

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