multiple questions regarding program speed

2020-02-27T17:08:37.376000Z

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).

multiple questions regarding program speed

2020-02-27T17:08:36.353000Z

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.

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multiple questions regarding program speed

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