====== Results for Yocto Images with Cyclictest ======

Cyclictest is part of the ''rt-tests'' package and is included in ''ost-devel'' images.

===== Test Methodology =====

The following command is executed for each core: 

<code>
cat /dev/zero > /dev/null
</code>

This causes 100% CPU utilization.
Then ''cyclictest'' is invoked using the following command, to run for 24h:

<code>
sudo ./cyclictest -n -Sp80 -l86400000000 -i1000 -h1000 -q > histogramm.log
</code>

''-l'' specifies the test duration in µs; ''24h*60min/h*60min/s*1000ms/s*1000us/ms = 86'400'000'000us''.

For more information about the flags, see [[software:linux:realtime:cyclictest|Cyclictest]].

===== Results =====

^ platform ^  latency (µs)  ^^^^^
^          ^ min ^ max ^ mode ^ avg ^ median ^
| cb20     | 11  | 52  | 15   | 15  | 15     | 
| cx2020   | 2   | 10  | 3    | 3   | 3      |
 
===== Histogramm =====

{{:software:linux:yocto:cyclictest-all-percent.png?400|}}
{{:software:linux:yocto:cyclictest-cb20-count-log.png?400|}}
{{:software:linux:yocto:cyclictest-cx2020-count-log.png?400|}}