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<?php require("../start_page.php"); start_page("performance/", "OProfile performance"); ?>
<h2>OProfile overhead</h2>
<p>
OProfile is low-overhead in most common cases; this is dependent on
the interrupt load OProfile has to deal with. The below results were
obtained with a pre-release version of OProfile 0.7 on a 2.6.0-test7
kernel. The hardware was an HP Netserver LPr with two 400Mhz Pentium
IIs. The overhead shown is the real-time overhead for compiling a Linux
kernel several times whilst OProfile is collecting data.
</p>
<p>
The x axis shows the mean average of profiling interrupts received per
second. The y axis shows the relative percentage overhead of the
real time to complete the task.
</p>
<p>
For comparison, the default settings of OProfile cause around 2,000
interrupts per CPU to be generated.
</p>
<?php
img("overhead.png", "OProfile is low overhead even at high rates of profiling interrupts", 726, 527);
?>
<?php require("$top/end_page.php"); end_page("performance/"); ?>