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<title> Zoltan Developer's Guide: Adding Parameters</title>
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<div ALIGN=right><b><i><a href="dev.html">Zoltan Developer's Guide</a>&nbsp; |&nbsp; <a href="dev_add_remap.html">Next</a>&nbsp; |&nbsp; <a href="dev_add_memory.html">Previous</a></i></b></div>
<h2>
<a NAME="new_parameters"></a>Adding new parameters</h2>
All parameters in Zoltan should be set and accessed through the <a href="dev_services_params.html">parameter
setting routines</a>. To add a new parameter to an existing method, you
need to do the following:
<ul>
<li>
In the source code for the desired method, search for&nbsp; the place where
the static array of parameters is defined. It will look something like:
<i>static
PARAM_VARS Method_params[] = { ... }</i>.&nbsp; Add a line with the name
of the new parameter, a pointer to the variable you want to associate (usually
NULL), and its type.</li>
<li>
In the method source code, bind the parameter to a local variable through
<b><a href="dev_services_params.html#Zoltan_Bind_Param">Zoltan_Bind_Param</a></b>.
Make sure you do this before <b><a href="dev_services_params.html#Zoltan_Assign_Param_Vals">Zoltan_Assign_Param_Vals
</a></b>is
invoked.</li>
<li>
Update the parameter function for the method in question. This routine
is typically called <b>Zoltan_</b><i>Method</i><b>_Set_Param</b><i>. </i>This
routine checks if a given string is a valid parameter for that method.
It may also verify the values.</li>
</ul>
When you add a new method to Zoltan, you also need to:
<ul>
<li>
Write a parameter function for your method that checks whether a given
string and value is a valid parameter pair for your method. See <b>Zoltan_RCB_Set_Param</b>
in <i>rcb/rcb.c</i> for an example.</li>
<li>
Let your method access the parameters via <b><a href="dev_services_params.html#Zoltan_Bind_Param">Zoltan_Bind_Param
</a></b>and
<b><a href="dev_services_params.html#Zoltan_Assign_Param_Vals">Zoltan_Assign_Param_Vals</a></b>.</li>
<li>
Change the parameter function array in <i>params/set_params.c</i> to include
your parameter function. Simply add a new entry to the static array that
looks like: <i>static ZOLTAN_SET_PARAM_FN * Param_func[] = {...}</i>.</li>
<li>
Make sure your method uses the <a href="../ug_html/ug_param.html#General_Parameters">key
parameters</a> in Zoltan correctly.</li>
</ul>
One useful convention is to put your method routine and your corresponding
parameter function in the same source file. This way you can define the
parameters in a static array. This convention eliminates&nbsp; the risk
of bugs caused by duplicate declarations (that are, incorrectly, not identical).
<br>
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<br>[<a href="dev.html">Table of Contents</a>&nbsp; |&nbsp; <a href="dev_add_remap.html">Next:&nbsp;
Part Remapping</a>&nbsp; |&nbsp; <a href="dev_add_memory.html">Previous:&nbsp;
Memory Management</a>&nbsp; |&nbsp; <a href="https://www.sandia.gov/general/privacy-security/index.html">Privacy and Security</a>]
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