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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
<html>
  <head>
    <title>Performance</title>
  </head>

  <body bgcolor="#FFFFFF">


<hr>
<center>
<table border=0 width=98%>
<tr><td valign=top align=left>
   <a href="H5.intro.html">Introduction to HDF5</a>&nbsp;<br>
   <a href="RM_H5Front.html">HDF5 Reference Manual</a>&nbsp;<br>
   <a href="index.html">Other HDF5 documents and links</a>&nbsp;<br>
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   And in this document, the 
   <a href="H5.user.html"><strong>HDF5 User's Guide:</strong></a>&nbsp;&nbsp;&nbsp;&nbsp;
      <br>
      <a href="Files.html">Files</a>&nbsp;&nbsp;
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      <a href="Chunking.html">Chunking</a>&nbsp;&nbsp;
      <a href="MountingFiles.html">Mounting Files</a>&nbsp;&nbsp;
      <br>
      Performance&nbsp;&nbsp;
      <a href="Debugging.html">Debugging</a>&nbsp;&nbsp;
      <a href="Environment.html">Environment</a>&nbsp;&nbsp;
      <a href="ddl.html">DDL</a>&nbsp;&nbsp;
</td></tr>
</table>
</center>
<hr>


    <h1>Performance Analysis and Issues</h1>

    <h2>1. Introduction</h2>

    <p>This section includes brief discussions of performance issues 
      in HDF5 and performance analysis tools for HDF5 or pointers to 
      such discussions.

    <h2>2. Dataset Chunking</h2>

        Appropriate dataset chunking can make a siginificant difference
        in HDF5 performance.  This topic is discussed in 
        <a href="Chunking.html">Dataset Chunking Issues</a> elsewhere
        in this <cite>User's Guide</cite>.

    <h2>3. Use of the Pablo Instrumentation of HDF5</h2>

      Pablo HDF5 Trace software provides a means of measuring the 
      performance of programs using HDF5. 

    <p>The Pablo software consists 
      of an instrumented copy of the HDF5 library, the Pablo Trace and 
      Trace Extensions libraries, and some utilities for processing the 
      output.  The instrumented version of the HDF5 library has hooks 
      inserted into the HDF5 code which call routines in the Pablo Trace 
      library just after entry to each instrumented HDF5 routine and 
      just prior to exit from the routine.  The Pablo Trace Extension 
      library has programs that track the I/O activity between the 
      entry and exit of the HDF5 routine during execution.  

    <p>A few lines of code must be inserted in the user's main program 
      to enable tracing and to specify which HDF5 procedures are to be 
      traced.  The program is linked with the special HDF5 and Pablo 
      libraries to produce an executable.   Running this executable on 
      a single processor produces an output file called the trace file 
      which contains records, called Pablo Self-Defining Data Format 
      (SDDF) records, which can later be analyzed using the 
      HDF5 Analysis Utilities. The HDF5 Analysis Utilites can be used 
      to interpret the SDDF records in the trace files to produce a 
      report describing the HDF5 IO activity that occurred during 
      execution.  

    <p>For further instructions, see the file <code>READ_ME</code> 
      in the <code> $(toplevel)/hdf5/pablo/ </code> subdirectory of 
      the HDF5 source code distribution. 

    <p>For further information about Pablo and the 
      Self-Defining Data Format, visit the Pablo website at
      <code><a href="http://www-pablo.cs.uiuc.edu/">http://www-pablo.cs.uiuc.edu/</a></code>.


<hr>
<center>
<table border=0 width=98%>
<tr><td valign=top align=left>
   <a href="H5.intro.html">Introduction to HDF5</a>&nbsp;<br>
   <a href="RM_H5Front.html">HDF5 Reference Manual</a>&nbsp;<br>
   <a href="index.html">Other HDF5 documents and links</a>&nbsp;<br>
   <!--
   <a href="Glossary.html">Glossary</a><br>
   -->
</td>
<td valign=top align=right>
   And in this document, the 
   <a href="H5.user.html"><strong>HDF5 User's Guide:</strong></a>&nbsp;&nbsp;&nbsp;&nbsp;
      <br>
      <a href="Files.html">Files</a>&nbsp;&nbsp;
      <a href="Datasets.html">Datasets</a>&nbsp;&nbsp;
      <a href="Datatypes.html">Datatypes</a>&nbsp;&nbsp;
      <a href="Dataspaces.html">Dataspaces</a>&nbsp;&nbsp;
      <a href="Groups.html">Groups</a>&nbsp;&nbsp;
      <br>
      <a href="References.html">References</a>&nbsp;&nbsp;
      <a href="Attributes.html">Attributes</a>&nbsp;&nbsp;
      <a href="Properties.html">Property Lists</a>&nbsp;&nbsp;
      <a href="Errors.html">Error Handling</a>&nbsp;&nbsp;
      <br>
      <a href="Filters.html">Filters</a>&nbsp;&nbsp;
      <a href="Caching.html">Caching</a>&nbsp;&nbsp;
      <a href="Chunking.html">Chunking</a>&nbsp;&nbsp;
      <a href="MountingFiles.html">Mounting Files</a>&nbsp;&nbsp;
      <br>
      Performance&nbsp;&nbsp;
      <a href="Debugging.html">Debugging</a>&nbsp;&nbsp;
      <a href="Environment.html">Environment</a>&nbsp;&nbsp;
      <a href="ddl.html">DDL</a>&nbsp;&nbsp;
</td></tr>
</table>
</center>
	


<hr>
<address>
<a href="mailto:hdfhelp@ncsa.uiuc.edu">HDF Help Desk</a>
</address>

<!-- Created: Thu Oct 14 16:46:00 CDT 1999 -->
<!-- hhmts start -->
Last modified: 14 October 1999
<!-- hhmts end -->

<br>
Describes HDF5 Release 1.4, February 2001


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