12 Performance
CPU load and tuning
In order to have a stable system one needs to consider the amount of load the system has. There
are more or less no limitations and therefore it is important to configure the system in a proper
way.
Our recommendation is that the cpu load for the CODESYS core must not be higher
than 70-75%
The Codeys core is bound to CPU Core 1 and Core 1 can be monitored from the iX application
with a specific System tag which can be inserted in the tag list with the command Add System
tag.
Points to consider for system tuning which has a direct impact on the cpu load are
configuration of tasks and external communication via ARTI protocol.
• Freewheeling tasks should never be used, only Cyclic.
Make sure that the cyclic task doesn’t take more time to execute than the configured
cyclic time. The recommendation is to always have a time slice available which is at least
30% of the configured interval.
Example
The configured cyclic interval is 10ms, the execution time of the programs associated with the
task is 2ms, this will create a time slice of 8ms which should be considered a valid configuration.
• The parameter Update rate in the ARTI driver has a direct affect on the cpu load. By
nature the ARTI driver is a polling driver which constantly polls the variables exposed
from the Symbol configuration in CODESYS. Depending on the amount of tags and
setting of the Update rate parameter the system can be tuned in terms of cpu load. For
more details of the settings see chapter 12.
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