| Re: why I can't use the max memory available? [message #54043] |
Thu, 17 May 2007 15:19  |
Jean H.
Messages: 472
Registered: July 2006
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Senior Member |
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Jenny wrote:
> Hi, I'm trying to use pcomp to calculate pca for a large number of
> variables, say over 10,000, only 6 observations though. I'm not sure
> if I'd obtain useful results by pca, but just want to give a try. On
> Windows XP Professional system IDL 6.3, I got the following error
> message: Unable to allocate memory: to make array
>
> However, when I type: help,/memory
> heap memory used: 2082561, max: 825942109, gets: 811,
> frees: 468
>
> My heap memory used is far smaller than the max available memory! I'm
> wondering why? Any ideas?
>
> Thanks,
> Jenny
You can have a look at
http://groups.google.com/group/comp.lang.idl-pvwave/msg/660e d64ccfe3a78d
or you can download the 'memtest' procedure from ITTVIS in order to
retrieve (or simply see if you use memtest) the size of the biggest
array you can create!
Jean
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| Re: why I can't use the max memory available? [message #54046 is a reply to message #54043] |
Thu, 17 May 2007 13:23  |
envi35@yahoo.ca
Messages: 48
Registered: March 2005
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Member |
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On May 17, 1:42 pm, David Fanning <n...@dfanning.com> wrote:
> Jenny writes:
>> Hi, I'm trying to use pcomp to calculate pca for a large number of
>> variables, say over 10,000, only 6 observations though. I'm not sure
>> if I'd obtain useful results by pca, but just want to give a try. On
>> Windows XP Professional system IDL 6.3, I got the following error
>> message: Unable to allocate memory: to make array
>
>> However, when I type: help,/memory
>> heap memory used: 2082561, max: 825942109, gets: 811,
>> frees: 468
>
>> My heap memory used is far smaller than the max available memory! I'm
>> wondering why? Any ideas?
>
> Try here:
>
> http://www.dfanning.com/fileio_tips/lgfiles.html
>
> Cheers,
>
> David
>
> --
> David Fanning, Ph.D.
> Fanning Software Consulting, Inc.
> Coyote's Guide to IDL Programming:http://www.dfanning.com/
> Sepore ma de ni thui. ("Perhaps thou speakest truth.")
Thanks!
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| Re: why I can't use the max memory available? [message #54055 is a reply to message #54046] |
Thu, 17 May 2007 10:42 |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Jenny writes:
> Hi, I'm trying to use pcomp to calculate pca for a large number of
> variables, say over 10,000, only 6 observations though. I'm not sure
> if I'd obtain useful results by pca, but just want to give a try. On
> Windows XP Professional system IDL 6.3, I got the following error
> message: Unable to allocate memory: to make array
>
> However, when I type: help,/memory
> heap memory used: 2082561, max: 825942109, gets: 811,
> frees: 468
>
> My heap memory used is far smaller than the max available memory! I'm
> wondering why? Any ideas?
Try here:
http://www.dfanning.com/fileio_tips/lgfiles.html
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")
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| Re: why I can't use the max memory available? [message #54108 is a reply to message #54055] |
Mon, 21 May 2007 15:21 |
Rick Towler
Messages: 821
Registered: August 1998
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Senior Member |
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David Fanning wrote:
> Jenny writes:
>
>> Hi, I'm trying to use pcomp to calculate pca for a large number of
>> variables, say over 10,000, only 6 observations though. I'm not sure
>> if I'd obtain useful results by pca, but just want to give a try. On
>> Windows XP Professional system IDL 6.3, I got the following error
>> message: Unable to allocate memory: to make array
>>
>> However, when I type: help,/memory
>> heap memory used: 2082561, max: 825942109, gets: 811,
>> frees: 468
>>
>> My heap memory used is far smaller than the max available memory! I'm
>> wondering why? Any ideas?
>
> Try here:
>
> http://www.dfanning.com/fileio_tips/lgfiles.html
David, you may want to add a bit of detail regarding adding the /3GB
switch to windows XP boot.ini file (which is what Karl is addressing in
point 1). This definitely will open up a larger chunk of contiguous RAM
on 32bit machines with >3GB of RAM but I have run into a few issues.
Namely, certain drivers may fail to load correctly when using the /3GB
switch. Giving the kernel just a wee bit more space seems to solve the
problem. This can be done using the /USERVA switch. Here's an example
from my boot.ini file (all on one line):
multi(0)disk(0)rdisk(0)partition(2)\WINDOWS="Microsoft Windows XP
Professional 3GB USERVA 2900" /fastdetect /3GB /userva=2900
It is interesting to note that the /3GB switch also works on machines
with 3GB of RAM installed. I don't know exactly how RAM is apportioned
between application and kernel in this scenario but the address space
for applications definitely is bigger. The /USERVA switch is even more
useful here since wherever the line is drawn, the kernel is in a tight
place and you can get some weird behaviors.
More details can be found here:
http://support.microsoft.com/kb/833721
-Rick
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