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As noted, originally CODESYS on raspberry is not real time,
in order to make programs on raspberry faster,
what is the best option?
I saw that it is possible to do it by adding "rt-preempt" in rasbian, but with a decrease of the CPU.
"rt-preempt" supported by OSADL,
and CODESYS contributes to the OSADL group.
which for me, assumes that the group is serious.
but is it necessary or appropriate to add "preempt-rt" to be in real time?
in my case I am not a raspbian _ ....
how not to make a mistake?
or then, does the software "Control for Raspberry Pi MC SL"
with a good definition:
attributions on the core.
priority of tasks.
type of task
cycle time.
enough to approach "real time"?
and what is a good task configurator setting?
group POUs, visualization, ....... by type, size ......
for me there is so much possibility that i don't see how to optimize this.
if you have ideas or tutorials, please let me know.
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
First, realtime means "with predictable latency". Usually realtime is at odds with throughput, i.e. realtime mode actually maximum throughput (except if the CPU-intensive task has non-realtime priority and Codesys has, but you can work around it playing with niceness if you want). A definition that is not totally right but gets the idea is that it reduces the deviation from the average throughput.
PREEMPT_RT is a kernel patch, you could follow the tutorial at https://lemariva.com/blog/2018/07/raspb ... nel-4-14-y to compile it (adjust the kernel version).
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
Originally created by: phenixrb
Hello everyone,
As noted, originally CODESYS on raspberry is not real time,
in order to make programs on raspberry faster,
what is the best option?
I saw that it is possible to do it by adding "rt-preempt" in rasbian, but with a decrease of the CPU.
"rt-preempt" supported by OSADL,
and CODESYS contributes to the OSADL group.
which for me, assumes that the group is serious.
but is it necessary or appropriate to add "preempt-rt" to be in real time?
in my case I am not a raspbian _ ....
how not to make a mistake?
or then, does the software "Control for Raspberry Pi MC SL"
with a good definition:
attributions on the core.
priority of tasks.
type of task
cycle time.
enough to approach "real time"?
and what is a good task configurator setting?
group POUs, visualization, ....... by type, size ......
for me there is so much possibility that i don't see how to optimize this.
if you have ideas or tutorials, please let me know.
First, realtime means "with predictable latency". Usually realtime is at odds with throughput, i.e. realtime mode actually maximum throughput (except if the CPU-intensive task has non-realtime priority and Codesys has, but you can work around it playing with niceness if you want). A definition that is not totally right but gets the idea is that it reduces the deviation from the average throughput.
PREEMPT_RT is a kernel patch, you could follow the tutorial at https://lemariva.com/blog/2018/07/raspb ... nel-4-14-y to compile it (adjust the kernel version).