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$ ./size-check
SIZE: 3792.000 SHARED: 324.000 UNSHARED: 3468.000 LENGTH($x): 0
...
Allocating a large string
SIZE: 23332.000 SHARED: 444.000 UNSHARED: 22888.000 LENGTH($x): 100000
+00
$

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#!/usr/bin/perl

...
    # linux on intel x86 has 4KB page size...
    return ( $size * 4, $share * 4 );
}