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<a name="Overflow-Errors"></a>
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<a name="Overflow-Errors-1"></a>
<h3 class="subsection">1.6.3 Overflow Errors</h3>
<p>These errors are reported by the application name prefacing one of the
following messages, except as noted below.
<a name="index-overflow"></a>
<a name="index-counter-overflow"></a>
<a name="index-memory-overflow"></a>
</p>
<dl compact="compact">
<dt> <code><var>application-name</var>: counter overflow (code <var>nn</var>)</code></dt>
<dd><p>An overflow occurred in an unsigned long integer being used as a reference
counter or something similar. This situation is very unlikely.
</p></dd>
<dt> <code><var>application-name</var>: memory overflow (code <var>nn</var>)</code></dt>
<dd><p>There wasn&rsquo;t enough memory to build an internal data structure. The
most likely cause is an attempt to operate on input
files that are too large. Standard remedies apply.
</p></dd>
</dl>

<p>The memory overflow or counter overflow messages can also be reported
without the application name preface or a code number. In these cases,
they arise in the course of evaluating the function given by the
application, rather than by loading the input files.
</p>
<p>A counter overflow in this case is possible if the application
attempts to compute the size of a very large, shared structure using
native integer arithmetic.
</p>
<a name="index-ulimit"></a>
<p>Memory overflows are possible due to insufficient memory for a valid
purpose, but may also occur due to a non-terminating recursion in the
virtual machine code. To prevent thrashing or other bad effects from
runaway code, the <code>ulimit</code> shell command is your friend.
</p>
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