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<h4 class="subsection">1.6.3 Overflow Errors</h4>

<p>These errors are reported by the application name prefacing one of the
following messages, except as noted below. 
<a name="index-overflow-73"></a><a name="index-counter-overflow-74"></a><a name="index-memory-overflow-75"></a>
     <dl>
<dt><var>application-name</var><code>: counter overflow (code </code><var>nn</var><code>)</code><dd>An overflow occurred in an unsigned long integer being used as a reference
counter or something similar. This situation is very unlikely. 
<br><dt><var>application-name</var><code>: memory overflow (code </code><var>nn</var><code>)</code><dd>There wasn'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. 
</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>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-g_t_0040command_007bulimit_007d-76"></a>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 <samp><span class="command">ulimit</span></samp> shell command is your friend.

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