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Trouble writing very large files [message #64729]

Thu, 15 January 2009 12:39

wlandsman
Messages: 743
Registered: June 2000

Senior Member

Vince Hradil posted a message in September about problems writing
large files. I am encountering the same problem, but with a
variation. Instead of giving a segmentation fault, IDL returns
without writing anything.

IDL> print,!version
{ x86_64 linux unix linux 7.0 Oct 25 2007 64 64}
IDL> im = intarr(4096,4096,256)
IDL> openw,1,'test.dat'
IDL> writeu,1,im
IDL> close,1
IDL> $ls -l test.dat
-rw-r--r-- 1 wlandsma shadow 0 2009-01-15 15:22 test.dat

If I instead do the same thing with a 4096 x 4096 x 255 array, then
IDL does crash with a segmentation fault. My guess is that an
internal IDL counter is not properly defined as 64 bit integer, and
so is being set to zero in my first case (where subscripts are a exact
multiple of two). In the second case it is being set to a negative
number and causing IDL to crash.

In any case this seems to be an internal IDL bug, since I should be
able to write these arrays on a 64 bit machine. --Wayne

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[Message index]

		Trouble writing very large files By: wlandsman on Thu, 15 January 2009 12:39
		Re: Trouble writing very large files By: Bringfried Stecklum on Fri, 16 January 2009 00:35
		Re: Trouble writing very large files By: Andrew Cool on Thu, 15 January 2009 19:35

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