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Re: Memory allocation for very large matrices??


From: Vincent Stanford
Subject: Re: Memory allocation for very large matrices??
Date: Sat, 02 Dec 2000 16:35:59 -0500

Dear Dennis,

8*16,641^2 = 2,215,383,048 = 2.2Gb.  The address space of most of the
Intel 32 bit processors is 2Gb.  In order to run this one in RAM, you
might consider an SGI with a MIPS 10k or a DEC Alpha with enough RAM. 
How soon the "two gig barrier" came up.  *Sigh*  Sixty-four bit AMD
Sledgehammer and Intel Itanium chips will do it in a few months on the
PC architecture if you want to wait.  Sorry I don't have a better
answer.

Vince Stanford

Dennis Gaidashev wrote:
> 
> I am trying to do the Singular Value Decomposition of a very large matrix
> (16641 by 16641) with the rank smaller than dimension by one. The
> matrix is read from a file, the three resulting matrices are
> writen into files. Here is the simple program I am using:
> 
> 

> I would appreciate any kind of advice on this.
> Thank you,
> Dennis Gaidashev
> 
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