[Eeglablist] More on memory, 64-bit Opteron
Arnaud Delorme
arno at salk.edu
Thu Mar 24 08:32:25 PST 2005
Dear Jim,
> Matlab has a limit on the size of an array or matrix because of the
> memory address size. On 32 bit computers it was 2^31 (maybe 32). On
> the 64-bit version, it's unfortunately still 2^31 for compatibility,
> but you can now have multiple of those arrays/matrixes.
I was able to reserve more than 3Gb in a single array (below) on the
beta version of Matlab 64-bit for AMD Opteron computer (ours has 6Gb of
RAM and is running Linux).
a 39000x10000 3120000000 double array
On the web page below (which is more than 6-month old so it might
already be outdated?), they mention that you should be able to create
arrays of size up to 16Gb under Matlab 64-bit
http://www.mathworks.com/access/helpdesk_beta/amd64/amd64_beta_rn.html
About your sampling frequency (2048 Hz). Unless you want to perform
simultaneous fMRI recordings, it is probably not necessary to sample at
more than 512Hz.
Arno
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