[Eeglablist] Out of Memory Error on EDF Import (25 channels, 400 Hz)

[Grega Repovs]

Jared,

To be able to open and work on large files in Matlab, you not only  
need enough RAM but also be able to address the available memory. The  
out of memory messages you are seing are not due to actual lack of  
physical RAM space but the amount of RAM you would need to address is  
larger than a 32 bit addressing system can handle. To be able to open  
and use such large files in Matlab, you need to run 64 bit version of  
Matlab. On Linux and Windows it means that you also need to run 64bit  
version of the operating system. On Mac OS X you can run 64 bit  
application in parallel with 32 bit ones. I have been using 64 bit  
Matlab and EEGLab on Mac OS X 10.5 and 10.6 without issues. With  
enough RAM I was able to have several 2+ GB recordings open in  
parallel. Recently I have also recompiled binica to run in 64 bit mode  
on Mac OS X - you can find and download it on EEGLab wiki.

Best,

Grega


On 8 Sep 2009, at 11:03 , Guillaume Rousselet wrote:

> Jared,
>
> 4GB of RAM should be enough. The problem is whether Matlab or your  
> operating system can actually use them. In my experience the only  
> way to make full use of your RAM is to run Matlab under Linux.  
> Windows XP, Vista, or mac OS X will fail.
>
> Hope this help,
>
> Best,
>
> GAR
>
> On 6 Sep 2009, at 02:45, Jared Saletin wrote:
>
>> Hi there,
>>
>> My name is Jared Saletin. I'm a grad student at UC Berkeley, still
>> learning EEGLab. I was wondering if someone may be able to help me
>> with a memory problem. We are trying to read in EDFs of sleep EEG
>> including 25 channels sampled at 400 Hz, recorded for about 120
>> minutes. The EDFs are about 200 mb in size.
>>
>> We are  receiving out of memory errors despite having 4 gb of RAM in
>> the systems.
>>
>> Should this not be enough memory for such a dataset? I'm more
>> concerned because some of our sleep recordings are 4 times that  
>> length.
>>
>> I'd appreciate any thoughts you all may have. Thanks so much!
>>
>> Cheers,
>> Jared
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>
>
>
> ************************************************************************************
> Guillaume A. Rousselet, Ph.D.
>
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>
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