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Re: Strange memory problem [message #18420 is a reply to message #18337]

Wed, 22 December 1999 00:00

thompson
Messages: 584
Registered: August 1991

Senior Member

"Julie Greenwood" <julieg@NOSPAMoceanweather.com> writes:

> Liam Gumley <Liam.Gumley@ssec.wisc.edu> wrote in message
> news:3860E331.C4E36EA4@ssec.wisc.edu...
>> "Mark D. Williams" wrote:
>>> FWIW, if you want to save time and memory, a faster way to do the above
>>> is as follows:
>>>
>>> WAVE> temp = BYTARR(1000,1000,25, /NoZero) + 10B
>>
>> I get the fastest response (in IDL) with
>>
>> temp = replicate(10B, 1000, 1000, 25)
>>
>> Cheers,
>> Liam.

> With IDL 5.3 on WinNT I got:

> temp = BYTARR(1000,1000,25, /NoZero) + 10B
> 1.8230000 Seconds

> temp = replicate(10B, 1000, 1000, 25)
> 6.3290000 Seconds

> I got tired of waiting (more than two minutes) for

> temp=bytarr(1000,1000,25) ; 0.351 seconds for this much
> temp(*)=10

I suggest redoing the test with

temp = BYTARR(1000,1000,25) + 10B

with the /NoZero keyword you get a much faster response, but nonsense values.
It's not really a fair test.

On my AlphaStation 500/333, I got the following times:

temp = BYTARR(1000,1000,25) + 10B
1.8984600 Seconds

temp = replicate(10B, 1000, 1000, 25)
1.2076780 Seconds

temp=bytarr(1000,1000,25)
temp(*)=10
9.2365350 Seconds

temp=bytarr(1000,1000,25)
temp(*)=10b
8.4264030 Seconds

Bill Thompson

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[Message index]

		Strange memory problem By: rkj on Tue, 21 December 1999 00:00
		Re: Strange memory problem By: Terry Smith on Thu, 23 December 1999 00:00
		Re: Strange memory problem By: rivers on Thu, 23 December 1999 00:00
		Re: Strange memory problem By: jeyadev on Wed, 22 December 1999 00:00
		Re: Strange memory problem By: Mark D. Williams on Wed, 22 December 1999 00:00
		Re: Strange memory problem By: m218003 on Wed, 22 December 1999 00:00
		Re: Strange memory problem By: Peter Mason on Wed, 22 December 1999 00:00
		Re: Strange memory problem By: thompson on Wed, 22 December 1999 00:00
		Re: Strange memory problem By: Julie Greenwood on Wed, 22 December 1999 00:00
		Re: Strange memory problem By: Alex Schuster on Wed, 22 December 1999 00:00
		Re: Strange memory problem By: thompson on Wed, 22 December 1999 00:00
		Re: Strange memory problem By: Julie Greenwood on Wed, 22 December 1999 00:00
		Re: Strange memory problem By: rkj on Wed, 22 December 1999 00:00

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