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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="index.html">HDF5 documents and links</a> <br>
<a href="H5.intro.html">Introduction to HDF5</a> <br>
<a href="RM_H5Front.html">HDF5 Reference Manual</a> <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>
<br>
<a href="Files.html">Files</a>
<a href="Datasets.html">Datasets</a>
<a href="Datatypes.html">Datatypes</a>
<a href="Dataspaces.html">Dataspaces</a>
<a href="Groups.html">Groups</a>
<br>
<a href="References.html">References</a>
<a href="Attributes.html">Attributes</a>
<a href="Properties.html">Property Lists</a>
<a href="Errors.html">Error Handling</a>
<br>
<a href="Filters.html">Filters</a>
<a href="Caching.html">Caching</a>
<a href="Chunking.html">Chunking</a>
<a href="MountingFiles.html">Mounting Files</a>
<br>
Performance
<a href="Debugging.html">Debugging</a>
<a href="Environment.html">Environment</a>
<a href="ddl.html">DDL</a>
<br>
<a href="Ragged.html">Ragged Arrays</a>
</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="index.html">HDF5 documents and links</a> <br>
<a href="H5.intro.html">Introduction to HDF5</a> <br>
<a href="RM_H5Front.html">HDF5 Reference Manual</a> <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>
<br>
<a href="Files.html">Files</a>
<a href="Datasets.html">Datasets</a>
<a href="Datatypes.html">Datatypes</a>
<a href="Dataspaces.html">Dataspaces</a>
<a href="Groups.html">Groups</a>
<br>
<a href="References.html">References</a>
<a href="Attributes.html">Attributes</a>
<a href="Properties.html">Property Lists</a>
<a href="Errors.html">Error Handling</a>
<br>
<a href="Filters.html">Filters</a>
<a href="Caching.html">Caching</a>
<a href="Chunking.html">Chunking</a>
<a href="MountingFiles.html">Mounting Files</a>
<br>
Performance
<a href="Debugging.html">Debugging</a>
<a href="Environment.html">Environment</a>
<a href="ddl.html">DDL</a>
<br>
<a href="Ragged.html">Ragged Arrays</a>
</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 -->
</body>
</html>
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