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

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Paul A. Rubin

Posts: 397
Registered: 12/7/04
Re: memory use
Posted: Sep 20, 1996 12:51 AM
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In article <51c4vv$b2u@ralph.vnet.net>,
rustybel@foothill.net (Russell Towle) wrote:
->Using MMA 2.2 on a PowerMac with 32MB RAM allocated to the kernel, I am
->assembling large arrays of integers which I pass to ListPlot3D. For
->example, a list of dimensions {490, 1091}. Simply to assemble this list
->uses so much memory that I cannot pass it to ListPlot3D in the same
->session; 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 or
->20MB to write a 3MB file?
->
->Russell Towle
->Giant Gap Press
->P.O. Box 141
->Dutch Flat, California 95714
->------------------------------
->Voice: (916) 389-2872
->e-mail: rustybel@foothill.net
->------------------------------
->
Are the integers literally integers, or expressions that reduce to
integers? (Although I'm not sure how much of a difference that makes.)

More to the point, have you tried using Share[] to reduce the memory
consumption?

-- Paul

->
->
->

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