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Topic: memory use
Replies: 2   Last Post: Sep 20, 1996 12:51 AM

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Harald Berndt

Posts: 6
Registered: 12/7/04
Re: memory use
Posted: Sep 20, 1996 12:48 AM
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Russell Towle wrote:
> ... so I thought that writing it to a file might be a good device.
> I use the syntax, (biglist >> "filename"), but to my surprise, the kernel
> requires tons of memory to execute this, even though the list "biglist" is
> already evaluated, and every element in it already resides in memory.
> By allocating 40 MB of memory to the kernel, I was able to write the list
> to a file. The file size itself was only 3MB. Why does MMA need 16

Yeah, well ... I ran into that problem quite often myself. I think the
problem is that using

biglist >> "filename"

one makes Mathematica convert all the numbers in the list from Mma's
internal representation to strings (in particular, each real is
written as an 18+ digit string), then write those strings to disk.
Very memory-demanding! A workaround might be to write your own binary
read and write routines (or just use those available, if that's
sufficient ... haven't looked at that in detail lately).

Harald Berndt, Ph.D. Research Specialist,

Phone: 510-652-5974 FAX: 510-215-4299
"I yam what I yam"...................................Popeye the sailor
(Kryten:............"I thought that was Descartes!"..................)
(Lister:............"So did I. mon, so did I!".......................)

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