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<Book proglang=oz>
  <Front>
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    <meta name="proglang.mode" arg1="fundamental" arg2="fundamental-mode">

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    <Meta name="html.split"       value="chapter.usage.opi">
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    <Meta name=ozversion value="3.0">
    <Meta name=status value=revised>
    <Title/Oz Panel/
    <Author.Extern to="author.db" key="Christian.Schulte">
    <Abstract>
      The Oz Panel is a graphical tool to visualize and control the
      most important parameters of a running Mozart system.
    </Abstract>
  <Body>

<chapter id="chapter.usage">
  <title/Usage/
<p>
This chapter briefly outlines the features of the Oz Panel.

<p>
<para><title/invoking/
The Panel is invoked by either feeding the 
expression
<<<{Panel.object open}>>>
or by selecting from the Oz Menu in the Oz Programming Interface the
<<Panel>> entry. Furthermore, it is possible to invoke the Panel from
the Oz Programming Interface with the key <KBD/C-C p/.

<p>
<para><title/monitor/The Panel <def/monitors/ the
most important system parameters. The Panel can be configured (see
<Ptr to="chapter.menu.options">) to also allow to
<para><title/configure/<def/configure/ system parameters. The Panel
works as a graphical frontend for the procedures 
<<Property.get>>
<index/<<Property>><and><<get>>/
and
<<Property.put>>
<index/<<Property>><and><<put>>/ that are described in
<Ptr.Extern to="ozdoc:system" key="chapter.property">.

<p>
<para><title/update/The panel periodically updates its display. By
default, only when the mouse pointer is over the Panel's window updating
takes place. However, this can be changed (see
<Ptr to="chapter.menu.options">).

<p>
The information the panel displays is described in 
<Ptr to="chapter.usage.threads">,
<Ptr to="chapter.usage.memory">,
<Ptr to="chapter.usage.problem">, and
<Ptr to="chapter.usage.opi">.

<p>

<section id="chapter.usage.threads">
  <title/Information on Threads/

  <P><table id="table.info.threads">
    <tr>
      <th colspan=2>Runtime</th>
    </tr>
        <tr>
          <th>Field</th>
          <th>Explanation</th>
        </tr>
        <tr>
          <td>Run</td>
          <td>Run time.</td>
        </tr>
        <tr>
          <td>Garbage collection</td>
          <td>Time spent on garbage collection.</td>
        </tr>
        <tr>
          <td>Copy</td>
          <td>Time spent on copying (that is, on cloning of spaces).</td>
        </tr>
        <tr>
          <td>Propagation</td>
          <td>Time spent on executing propagators.</td>
        </tr>
        <tr>
          <td>
            <Picture.Extern id="runtime-load.gif" to="runtime-load.gif" type=gif>
          </td>
          <td>Operating system load of the Mozart engine.</td>
        </tr>
        <tr>
          <td>
            <Picture.Extern id="runtime-dist.gif" to="runtime-dist.gif" type=gif>
          </td>
          <td>Relative distribution of entire computation time.</td>
        </tr>
    <tr>
      <th colspan=2>Threads</th>
    </tr>
        <tr>
          <th>Field</th>
          <th>Explanation</th>
        </tr>
        <tr>
          <td>Created</td>
          <td>Total number of threads created.</td>
        </tr>
        <tr>
          <td>Runnable</td>
          <td>Number of currently runnable threads.</td>
        </tr>
        <tr>
          <td>
            <Picture.Extern id="threads-runnable.gif" to="threads-runnable.gif" type=gif>
          </td>
          <td>Number of currently runnable threads..</td>
        </tr>
    <tr>
      <th colspan=2>Priorities</th>
    </tr>
        <tr>
          <th>Field</th>
          <th>Explanation</th>
        </tr>
        <tr>
          <td>High / Medium</td>
          <td>        Relation between time slices available for threads of
        priorities <<high>> and <<medium>>. </td>
        </tr>
        <tr>
          <td>Medium / Low</td>
          <td>        Relation between time slices available for threads of
        priorities <<medium>> and <<low>>. </td>
        </tr>
  </table>

</section>

  
<section id="chapter.usage.memory">
  <title/Information on Memory/

  <P><table id="table.heap.usage">
    <tr>
      <th colspan=2>Heap Usage</th>
    </tr>
        <tr>
          <th>Field</th>
          <th>Explanation</th>
        </tr>
        <tr>
          <td>Threshold</td>
          <td>Heap size when next automatic garbage collection takes
        place. Gets recomputed after every garbage collection.</td>
        </tr>
        <tr>
          <td>Size</td>
          <td>Current heap size.</td>
        </tr>
        <tr>
          <td>Active Size</td>
          <td>Heap size after last garbage collection.</td>
        </tr>
        <tr>
          <td>
            <Picture.Extern id="memory-heap.gif" to="memory-heap.gif" type=gif>
          </td>
          <td>Displays the three values from above.</td>
        </tr>
    <tr>
      <th colspan=2>Heap Parameters</th>
    </tr>
        <tr>
          <th>Field</th>
          <th>Explanation</th>
        </tr>
        <tr>
          <td>Minimal Size</td>
          <td>Minimal heap size.</td>
        </tr>
        <tr>
          <td>Free</td>
          <td>Gives the percentage of free heap memory after garbage
        collection. For example, a value of $75$ means that 
        the heap threshold is set to approximately: 
        <Math class=display>\mbox{Active Size} * 100/(100-75)</Math>
	that is:
        <Math class=display>\mbox{Active Size} * 4.</Math></td>
        </tr>
        <tr>
          <td>Tolerance</td>
          <td>Gives the percentage by which the system is allowed for
        purposes of better memory allocation to
          increase the heap 
          threshold.</td>
        </tr>
    <tr>
      <th colspan=2>Garbage Collector</th>
    </tr>
        <tr>
          <th>Field</th>
          <th>Explanation</th>
        </tr>
        <tr>
          <td>Active</td>
          <td>Whether garbage collection is invoked automatically.</td>
        </tr>
  </table>

</section>

  
<section id="chapter.usage.problem">
  <title/Information on Problem Solving/

  <P><table id="table.problem.solving">
    <tr>
      <th colspan=2>Finite Domain Constraints</th>
    </tr>
        <tr>
          <th>Field</th>
          <th>Explanation</th>
        </tr>
        <tr>
          <td>Variables Created</td>
          <td>Number of finite domain variables created.</td>
        </tr>
        <tr>
          <td>Propagators Created</td>
          <td>Number of finite domain propagators created.</td>
        </tr>
        <tr>
          <td>Propagators Invoked</td>
          <td>Number of finite domain propagators invoked.</td>
        </tr>
    <tr>
      <th colspan=2>Spaces</th>
    </tr>
        <tr>
          <th>Field</th>
          <th>Explanation</th>
        </tr>
        <tr>
          <td>Created</td>
          <td>Number of computation spaces created by <<Space.new>>.</td>
        </tr>
        <tr>
          <td>Cloned</td>
          <td>Number of computation spaces cloned by <<Space.clone>>.</td>
        </tr>
        <tr>
          <td>Committed</td>
          <td>Number of computation spaces committed by <<Space.commit>>.</td>
        </tr>
        <tr>
          <td>Failed</td>
          <td>Number of failed computation spaces.</td>
        </tr>
        <tr>
          <td>Succeeded</td>
          <td>Number of succeeded computation spaces.</td>
        </tr>
  </table>

</section>

  
<section id="chapter.usage.opi">
  <title/Information on Programming Interface/

  <P><table id="table.usage.opi">
    <tr>
      <th colspan=2>Status Messages</th>
    </tr>
        <tr>
          <th>Field</th>
          <th>Explanation</th>
        </tr>
        <tr>
          <td>Idle</td>
          <td>Whether messages are printed when the Mozart engine gets 
               idle.</td>
        </tr>
        <tr>
          <td>Garbage Collection</td>
          <td>Whether messages on garbage collection are printed.</td>
        </tr>
    <tr>
      <th colspan=2>Output</th>
    </tr>
        <tr>
          <th>Field</th>
          <th>Explanation</th>
        </tr>
        <tr>
          <td>Maximal Depth</td>
          <td>Maximal depth used for <<System.show>> and <<System.print>> (See also <Ptr.Extern to="ozdoc:system" key="chapter.system">).</td>
        </tr>
        <tr>
          <td>Maximal Width</td>
          <td>Maximal width used for <<System.show>> and <<System.print>> (See also <Ptr.Extern to="ozdoc:system" key="chapter.system">).</td>
        </tr>
    <tr>
      <th colspan=2>Errors</th>
    </tr>
        <tr>
          <th>Field</th>
          <th>Explanation</th>
        </tr>
        <tr>
          <td>Show Location</td>
          <td>Whether error messages contain location information.</td>
        </tr>
        <tr>
          <td>Show Hints</td>
          <td>Whether error messages contain hints.</td>
        </tr>
        <tr>
          <td>Maximal Depth</td>
          <td>Maximal depth used for printing values in error messages.</td>
        </tr>
        <tr>
          <td>Maximal Width</td>
          <td>Maximal width used for printing values in error messages.</td>
        </tr>
        <tr>
          <td>Maximal Tasks</td>
          <td>Maximal number of tasksk on the thread to be printed.</td>
        </tr>
  </table>

</section>

  

</chapter>


<chapter id="chapter.menu">
  <title/The Menu Bar/

<p>
<section id="chapter.menu.panel">
<title/The <<Panel>> Menu/
<p>
This menu contains operations to clear and close the panel and to stop
the Oz system.
<p>
<list>
<entry><menu/About.../
<item>
Displays a window containing short information on the
Panel.

<Entry><menu key="C-r"/Reset/
<Item>Clears all monitoring information of the Panel.

<Entry><menu/Save Parameters&ellipsis;/
<Item>
Save the current system parameters settings to a file. Feeding that file
resets the system parameters to their saved values. 

<Entry><menu/Shutdown System&ellipsis;/
<Item>
After confirmation with a dialog the entire Oz system is halted.

<Entry><menu key="C-x"/Close/
<Item>
Closes the Panel window.
</list>
</section>


<section id="chapter.menu.options">
<title/The <<Options>> Menu/
<p>
<list>
<Entry><menu/Configure/
<Item>
Toggles whether the Panel provides for monitoring only, or for both
monitoring and configuring.

<Entry><menu/Update&ellipsis;/
<Item>
Creates a dialog to set options when the Panel updates its display.
<<Update Time>> gives the time period after which the display is
updated.
<<Update Requirement>> allows to toggle whether the display is
updated, only if the mouse pointer is over the Panel's window.


<Entry><menu/History&ellipsis;/
<Item>
Creates a dialog to set the history range for the thread and memory 
graphs.
</list>
</chapter>

<chapter id="chapter.object">
<title/The <<Panel>> Object/
<p>
This chapter lists all methods of the <<Panel>> object. New
Panels can be created by 
creating new objects from the class <<Panel.'class'>>. Execution of
<index class=module/Panel/
<<<MyPanel = {New Panel.'class' init}>>>
creates a new Panel which can be accessed by the variable
<<MyPanel>>.

<section>
<title/Invoking/
<p>
<list>
<entry>open
<Synopsis>
<<<{Panel.'object' open}>>>
<index class=module/<<Panel>><and><<open>>/
<Item>
Invokes the Panel.
</list>
</section>

<section>
<title/Options/
<p>
<list>
<entry>option
<Synopsis>
<<<{Panel.'object' option(configure ?+{B})>>>
<index class=module/Panel<and>option/
<item>
Toggles whether the panel allows to configure system parameters.

<entry>option
<Synopsis>
<<<{Panel.'object' option(update time:  ?+{I}<=_
                              mouse: ?+{B}<=_)}>>>
<index class=module/Panel<and>option/
<item>
Sets the parameters for updating as described in
<Ptr to="chapter.menu.options">.

<entry>option
<Synopsis>
<<<{Panel.'object' option(history range: ?+{I}<=_)>>>
<index class=module/Panel<and>option/
<Item>
Sets the parameters for the history range as described in
<Ptr to="chapter.menu.options">.
</list>
</section>
</chapter>




  
</Book>
