[Eeglablist] [PMX:####] Having memory size problems, how do people handle this?

Arnaud Delorme arno at salk.edu
Thu Jan 13 11:46:54 PST 2005

Dear Jim,

under Matlab you said that you had 2 Gigs available and you were trying 
to import a 3-Gig file, so it cannot work. As far as I know, Matlab will 
not not use the swap to reserve memory for big arrays. I think Matlab 
cannot create arrays which size go beyond the available memory (however 
once created, some memory may be released by using the swap).

Hope this help,


Jim Kroger wrote:

> Hi, we're trying to analyze EEG data collected with a Biosemi 128 
> channel system. Some of our data files are around 3 gigabytes. We 
> started with Windows and Matlab, but have since purchased the newest 
> Suse for our Dual Opteron IBM Intellistation APro and have installed 
> 64 bit Matlab and EEGLAB. Still, today when we tried to load a 2 gig 
> file, we got a Matlab out of memory error. When we installed Suse, we 
> allocated 7 gigs to it, and we made a 2 gig swap partition. We presume 
> we have it things set up so that it uses the swap partition as desired 
> (??). We have one gig of ram for each processor; as I understand it, 
> the machine shares these so that the processor we are effectively 
> using to run Matlab has 2 gigs available.
> Where do we need to tackle this problem? Should we increase swap? Is 
> our problem too little RAM? Is it just impossible to work with files 
> above a certain size?  If the latter, how do you Biosemi users 
> approach this problem?
> Many thanks for any info,
> Jim

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