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<h2>15.5 Memory allocation fails under Windows</h2>

<p><em><strong>Q</strong>: I'm running in Windows 3.X DOS box, but DJGPP complains about
there not being enough DPMI memory, although virtual memory is enabled.</em>

<br><p>
<p><strong>A</strong>: You must make sure the size of your Windows swap file can be at
least 2 times the largest virtual memory size you need.  Check if you
have enough free disk space; if you do, run a defragger (Windows needs
the swap file to be contiguous).  The size of the swap file is normally
limited by the "virtual = 4 times free physical" rule, but you can
change that by inserting the line

<pre> PageOverCommit=n
</pre>

<p>in the <code>[386Enh]</code> section of your <code>SYSTEM.INI</code> file.  The
parameter <code>n</code> is 4 by default, but can be set to be as large as 20.

<p><hr>
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