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More on memory usage problems


From: John W. Eaton
Subject: More on memory usage problems
Date: Fri, 08 Aug 2008 10:44:38 -0400

On  8-Aug-2008, Nose Nada wrote:

| I have other problems with memory usage in Octave that I didn't comment in
| my previous post ("Memory usage problems", 8/8/2008 at 1:20 am).
| All start with a tab delimited .txt datafile of 25MB. When I use 'xlsread'
| to extract the numeric and the string data from this file and save it in a
| new binary file, it takes a long time because my 3GB of RAM are consumed and
| around 300MB of swap are used. Still, after 2 hours I have a binary file
| containing the numeric and the string data output by "xlsread". The
| resulting binary file has 280MB and it is the input of the "load" I
| described in my previous post. I get rid of "xlsread" and used fread
| instead, but the problem persists.
| Why is the resulting binary 10 times bigger than the original .txt?
| Why the use of RAM far exceeds the size of the data file I'm dealing with?

I think your description is too vague.  What do you mean by "save it
in a binary file"?  What format?  Precisely what is the original
format of your file?  Precisely how are you trying to read it?

| I'm stuck here. This issue don't allow me to go ahead with my work. I would
| appreciate to have some feedback.

Please remember that everyone on this list is an Octave user just like
you, and volunteers their time to help answer questions.

jwe


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