| Re: Large TIFF file question [message #28919 is a reply to message #28823] |
Wed, 16 January 2002 06:54  |
Mark Rivers
Messages: 49
Registered: February 2000
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David Fanning <david@dfanning.com> wrote in message
news:MPG.16af2ce16a9304e39897d3@news.frii.com...
> Martin Downing (martin.downing@ntlworld.com) writes:
>
>> If you are crazy/unfortunate enough to be doing this on a windows OS,
you'll
>> be facing the 1/2Gb limit on process memory, and anyway no matter how
much
>> memory you have the chances are you will be watching the grass grow as
page
>> faulting takes up most of the time :( [I'd be happy for someone to
prove
>> me wrong!]. Craig's method is undoubtedly the way to go.
>
> I thought one of the features of IDL 5.4 or 5.5 (I
> can't recall, since I just woke up and I'm sitting
> here scratching myself and waiting for the coffee
> to boil) was an RSI hack that allowed the PCs to
> exceed these memory limits. I remember this as being
> one of the most significant, but completely unheralded,
> items of that release.
If you find anything documenting that I'd be most interested to hear about
it. I routinely bump into this limit on Windows machines with 1GB of RAM,
reading 3-D tomography data sets that are 400-600 MB. .RESET_SESSION_ALL
sometimes helps, but I have to exit/restart IDL very frequently because the
memory gets fragmented.
Question for the group: IDL runs on a number of 64-bit operating systems,
e.g. Solaris 8, etc. But my understanding was that IDL on such platforms
was still 32 bits, so that, for example, the largest array element IDL could
access was still a 32-bit pointer and a 4GB array would be an absolute
limit, with 1-2 GB being more typical system-specific limits. Is this true?
The new 64-bit Itanium processors have arrived, and there is a 64-bit
version (beta) of Windows to support them. I hope IDL releases a version
SOON that can take advantage of the additional memory. Hardware has caught
up to software sooner than we all expected.
Mark
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