[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,

Arno

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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