[NCLUG] Testing memory pressure

[Chad Perrin]

On Thu, Jan 13, 2011 at 10:04:19AM -0700, Bob Proulx wrote:
> 
> Second you could use a very simple program to hog memory at whatever
> value you want.  Here is a very simple one.  Originally written to hog
> memory and push a machine into vm thrashing.
> 
> Bob
> 
> #include <stdlib.h>
> #include <stdio.h>
> main()
> {
>   char *array;

<snip>

My first thought was "Make really really big arrays."  That's pretty
simple to do in most languages, especially high level dynamic languages
like Perl and Ruby.

    #!/usr/bin/env perl
    my @foo;
    foreach (1..$ARGV[0]) { push(@foo,$_); }
    while (1) { sleep $ARGV[1]; push(@foo,'foo'); }

You can specify a starting array length with a command line argument, and
a wait time between additional elements being pushed into the array (in
seconds) with a second argument, with this version.  Example:

    ./filename.pl 400 0.01

There's probably a more efficient way to do that, but since efficiency
isn't really the point in this case, I'm not sure it matters.

-- 
Chad Perrin [ original content licensed OWL: http://owl.apotheon.org ]
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