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Memory problems update. [message #241]

Wed, 08 January 1992 10:24

thompson
Messages: 584
Registered: August 1991

Senior Member

To test the memory limitations of IDL version 1 versus version 2.2.1, I ran the
following program to see where it would crash.

for i = 1,100
j = 100*i
print,j
a = fltarr(j,j)
endfor
end

I have a pagefile quota of 78471 blocks. I chose this method primarily because
I had heard rumors that if one recreates an array that already exists with a
size bigger than it had before, the old memory is not deallocated.

IDL version 1 was unable to obtain enough memory to build the 2000x2000 array,
while IDL version 2 was unable to build the 1400x1400 array.

This seems to be consistent with IDL version 2 not deallocating the memory,
since 1400x1400 would then be where the accumulated total would exceed the
pagefile quota.

Just saying "a = fltarr(2000,2000)" in a seperate IDL 2.2.1 session does work,
however, as does

a = fltarr(1900,1900)
a = fltarr(2000,2000)

Does anybody know what causes this? Is the rumor I heard true?

Bill Thompson

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[Message index]

		Memory problems update. By: thompson on Wed, 08 January 1992 10:24
		Re: Memory Problems By: rigby on Fri, 16 August 1996 00:00
		Re: Memory Problems By: thompson on Thu, 15 August 1996 00:00

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