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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"><head>	<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />	<style type="text/css">	body { font-family: Verdana, Arial, Helvetica, sans-serif;}	a.at-term {	font-style: italic; }	</style>	<title>MPI Basic Datatypes</title>	<meta name="Generator" content="ATutor">	<meta name="Keywords" content=""></head><body> <p>One of the main goals of MPI is to allow for portability between platforms.&nbsp; One of the significant differences between computing systems is the size and accuracy of the different datatypes.</p>

<p>To manage the issue of portability, MPI defines its own internal datatypes. When passing data to an MPI routine, the user specifies which MPI datatype matches with the language datatype of the variable or array.  MPI then will take care of any data conversions necessary when sending data from one process to another.</p>

<p>Since intrinsic C and Fortran datatypes vary from machine to machine, the MPI standard <em>requires</em> that any MPI implementation support the following MPI datatypes:</p>

<h3>MPI Basic Datatypes - C</h3>

<table class="info" >
<tr>
<th>MPI Datatype</th>

<th>C Datatype</th>
</tr>

<tr>
<td>MPI_CHAR</td>

<td>Signed char</td>
</tr>

<tr>
<td>MPI_SHORT</td>

<td>Signed short int</td>
</tr>

<tr>
<td>MPI_INT</td>

<td>Signed int</td>
</tr>

<tr>
<td>MPI_LONG</td>

<td>Signed long int</td>
</tr>

<tr>
<td>MPI_UNSIGNED_CHAR</td>

<td>Unsigned char</td>
</tr>

<tr>
<td>MPI_UNSIGNED_SHORT</td>

<td>Unsigned short int</td>
</tr>

<tr>
<td>MPI_UNSIGNED</td>

<td>Unsigned int</td>
</tr>

<tr>
<td>MPI_UNSIGNED_LONG</td>

<td>Unsigned long int</td>
</tr>

<tr>
<td>MPI_FLOAT</td>

<td>Float</td>
</tr>

<tr>
<td>MPI_DOUBLE</td>

<td>Double</td>
</tr>

<tr>
<td>MPI_LONG_DOUBLE</td>

<td>Long double</td>
</tr>

<tr>
<td>MPI_BYTE</td>

<td></td>
</tr>

<tr>
<td>MPI_PACKED</td>

<td></td>
</tr>
</table>

<h3>MPI Basic Datatypes - Fortran</h3>

<table class="info" >
<tr>
<th>MPI Datatype</th>

<th>Fortran Datatype</th>
</tr>

<tr>
<td>MPI_INTEGER</td>

<td>INTEGER</td>
</tr>

<tr>
<td>MPI_REAL</td>

<td>REAL</td>
</tr>

<tr>
<td>MPI_DOUBLE_PRECISION</td>

<td>DOUBLE PRECISION</td>
</tr>

<tr>
<td>MPI_COMPLEX</td>

<td>COMPLEX</td>
</tr>

<tr>
<td>MPI_LOGICAL</td>

<td>LOGICAL</td>
</tr>

<tr>
<td>MPI_CHARACTER</td>

<td>CHARACTER(1)</td>
</tr>

<tr>
<td>MPI_BYTE</td>

<td></td>
</tr>

<tr>
<td>MPI_PACKED</td>

<td></td>
</tr>
</table></body></html>
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