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Re: writing large 3D data file fails [message #68244 is a reply to message #68235]

Thu, 08 October 2009 04:32

Nigel Wade
Messages: 286
Registered: March 1998

Senior Member

I can't test your exact array because I don't have sufficient RAM, that
array is over 50GB and I only have 32GB.

However, attempting to write a smaller array (fltarr(4008,4008,200),
which by my reckoning is about 12GB) causes a segmentation violation. The
resulting file in my case is actually empty.

IDL> volume=fltarr(4008,4008,200)
IDL> help,/memory
heap memory used: 12852030500, max: 12916286829, gets: 459,
frees: 142
IDL> GET_LUN, lun
IDL> OPENW, lun,'bigfile'
IDL> WRITEU, lun, volume
Segmentation fault

# ls -l bigfile
-rw-r--r-- 1 root root 0 Oct 8 12:25 bigfile

I don't think WRITEU likes very big files. Maybe it's not built with
largefile support, and internally uses a 32bit file pointer. I can't see
why it would be being a 64bit application, but what else might cause the
error?

--
Nigel Wade

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[Message index]

		Re: writing large 3D data file fails By: penteado on Thu, 08 October 2009 07:26
		Re: writing large 3D data file fails By: Nigel Wade on Thu, 08 October 2009 04:32
		Re: writing large 3D data file fails By: dorthe on Thu, 08 October 2009 02:13
		Re: writing large 3D data file fails By: Nigel Wade on Thu, 08 October 2009 01:32
		Re: writing large 3D data file fails By: dorthe on Thu, 08 October 2009 01:10
		Re: writing large 3D data file fails By: JohnSmith on Wed, 07 October 2009 11:01
		Re: writing large 3D data file fails By: David Fanning on Wed, 07 October 2009 09:05
		Re: writing large 3D data file fails By: dorthe on Tue, 13 October 2009 02:58

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