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G4-related problem [message #36021]

Mon, 11 August 2003 05:47

Rudi Schäfer
Messages: 1
Registered: August 2003

Junior Member

Hi.

I recently discovered a very nasty problem on my G4 (2*867, Mac OS X
10.2.6) running IDL 5.6.

The following code should not produce any output, if everything works.
Unfortunately, this is not the case on my G4, where the variable
assignment "data1=data0" produces messy data in a randomly fashion. So
it works most of the time, but once in a while, the data in "data1" will
be corrupted. Typically, there are some zeros showing up in the array
and some other garbage.

Here is the code in question:

data0=fltarr(10000)+1.
for ii=0L, 200000 do begin & $
data1=data0 & $
if min(where(data1 eq 0)) gt 0 then begin & $
print, ii & ii=200001L & endif & $
endfor

This problem did not show up on other machines I have tested (Compaq
Alpha, a Windows PC or my iMac G3 running the same OS and IDL versions).

So this can either be a G4-specific bug in IDL 5.6, a G4-specific bug in
Mac OS X 10.2.6, or a hardware problem on my G4.

Since I do not have a second G4 available, I would like to ask anyone
with a G4 to test the code snippet given above. You can simply paste the
code to the command line in IDL.

Thank you,
Rudi

PS: What I already tested:
- setting TPOOL_NTHREADS=1 and VECTOR_ENABLE=0
- using different RAM
- replacing the RAM modules
- testing the RAM with the hardware test CD

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[Message index]

		G4-related problem By: Rudi Schäfer on Mon, 11 August 2003 05:47
		Re: G4-related problem By: Karl Schultz on Fri, 15 August 2003 10:50
		Re: G4-related problem By: Karl Schultz on Wed, 03 September 2003 09:26
		Re: G4-related problem By: K. Bowman on Wed, 03 September 2003 09:45
		Re: G4-related problem By: DPJ on Sat, 04 October 2003 06:01
		Re: G4-related problem By: Jean Koclas on Mon, 11 August 2003 15:02
		Re: G4-related problem By: MKatz843 on Mon, 11 August 2003 12:24
		Re: G4-related problem By: MKatz843 on Mon, 11 August 2003 11:38
		Re: G4-related problem By: Kenneth P. Bowman on Mon, 11 August 2003 08:40
		Re: G4-related problem By: Mark Hadfield on Sun, 05 October 2003 14:21
		Re: G4-related problem By: James Kuyper on Sun, 05 October 2003 09:34
		Re: G4-related problem By: DPJ on Sun, 05 October 2003 07:34
		Re: G4-related problem By: Kenneth P. Bowman on Sat, 04 October 2003 09:25

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