| Re: Trouble writing very large files [message #64819 is a reply to message #64729] |
Fri, 16 January 2009 00:35   |
Bringfried Stecklum
Messages: 75
Registered: January 1996
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Member |
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wlandsman wrote:
> 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
It seems to be a writeu bug since save works fine
IDL Version 6.4 (linux x86_64 m64). (c) 2007, ITT Visual Information Solutions
Installation number: 12207.
Licensed for use by: TLS Tautenburg
IDL> hhh=intarr(4096,4096,128)
IDL> openw,1,'hhh'
IDL> writeu,1,hhh
Segmentation fault
2nd attempt
IDL> hhh=intarr(4096,4096,128)
IDL> save,hhh,file='hhh'
IDL> exit
Regards,
Bringfried
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