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<html><head>
<title>Profiling</title>
<link rel="stylesheet" type="text/css" href="reference.css">
</head>
<body>
<a href="../start.htm">Nyquist / XLISP 2.0</a> -
<a href="../manual/contents.htm">Contents</a> |
<a href="../tutorials/tutorials.htm">Tutorials</a> |
<a href="../examples/examples.htm">Examples</a> |
<a href="reference-index.htm">Reference</a>
<hr>
<h1>profile</h1>
<hr>
<p><table cellpadding="0" cellspacing="0" style="margin-left:10px"><tbody>
<tr valign="top">
<td><nobr>Type:</nobr></td>
<td><nobr> - </nobr></td>
<td width="100%"><nobr>function (subr)</nobr></td>
</tr>
<tr valign="top">
<td><nobr>Source:</nobr></td>
<td><nobr> - </nobr></td>
<td width="100%"><nobr>xlsys.c, xleval.c</nobr></td>
</tr>
</tbody></table></p>
<h2>Syntax</h2>
<a name="profile"></a>
<p><div class="box">
<dl>
<dt>(<b>profile</b> <i>flag</i>) - turn profiling on or off</dt>
<dd><i>flag</i> - NIL turns profiling off, otherwise on<br>
returns - the previous state of profiling</dd>
</dl>
</div></p>
<h2>Description</h2>
<p>The <nobr>Xlisp 2.0</nobr> release has been extended with a profiling
facility, which counts how many times and where <a href="eval.htm">eval</a>
is executed. <nobr>A separate</nobr> count is maintained for each named
function, closure, or macro, and a count indicates an
<a href="eval.htm">eval</a> in the immediately [lexically] enclosing named
function, closure, or macro. Thus, the count gives an indication of the
amount of time spent in a function, not counting nested function calls.</p>
<p>The list of all functions executed is maintained on the global *profile*
variable. These functions in turn have *profile* properties, which maintain
the counts. The profile system merely increments counters and puts symbols
on the *profile* list. <nobr>It is</nobr> up to the user to initialize data
and gather results. Profiling is turned on or off with the 'profile'
function.</p>
<p>Unfortunately, methods cannot be profiled with this facility.</p>
<h2>Examples</h2>
<pre class="example">
</pre>
<p><nobr> <a href="#top">Back to top</a></nobr></p>
<hr>
<a href="../start.htm">Nyquist / XLISP 2.0</a> -
<a href="../manual/contents.htm">Contents</a> |
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<a href="../examples/examples.htm">Examples</a> |
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</body></html>
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