1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
|
<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE topic PUBLIC "-//OASIS//DTD DITA Topic//EN" "topic.dtd">
<topic xml:lang="en-us" id="ts_host-freq-boost">
<title>Performance Variation with Frequency Boosting</title>
<body>
<p>
Many multicore processors support some form of frequency
boosting, which means that if only one core is utilized, it can
run possibly 50% faster or even more than the rated CPU
frequency. This causes measured performance to vary somewhat as
a function of the momentary overall system load. The exact
behavior depends strongly on the specific processor model.
</p>
<p> As a consequence, benchmarking on systems which utilize frequency boosting may produce
unstable and nonrepeatable results. This is especially true if benchmark runs are short, of
the order of seconds. To obtain stable results, benchmarks must be run over longer periods of
time and with a constant system load apart from the VM being tested. </p>
</body>
</topic>
|
