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Thu, 18 March 2021 07:59

Eclipse User

if i have four composite fb, each contains a e_cycle fb, the duration is 5ms,

would that cause performance issues or event stack would be full?

Re: mutiple cycle using [message #1839256 is a reply to message #1839254]

Thu, 18 March 2021 08:19

Eclipse User

this strongly depends on your cpu. but normally it should not be a problem. The only thing that can be problematic is that you have one FB blcoking your execution thread for some time. Then you get an external event queue full. The external event queu is currently around 10 or so with 5ms fbs it means that an fb would block for longer then 50ms. If that is the case then you can always split up your application to several resources. Each resource has its own queues. And if that is not enough you can use the real-time event sources. Where each real-time event block has its own thread.

Re: mutiple cycle using [message #1839259 is a reply to message #1839256]

Thu, 18 March 2021 08:48

Eclipse User

Thanks for quick response,, so mutilple resources and rt- event, which is better

Re: mutiple cycle using [message #1839295 is a reply to message #1839259]

Thu, 18 March 2021 17:32

Eclipse User

I would use rt_events only as last resort and with care. They can be dangerouse!

Re: mutiple cycle using [message #1839312 is a reply to message #1839295]

Fri, 19 March 2021 04:30

Eclipse User

the resouce way communication depends on sub/pub, that's too complex,
could you plz tell me why it is dangerous?
i think it just run a thread

Re: mutiple cycle using [message #1839397 is a reply to message #1839312]

Fri, 19 March 2021 16:07

Eclipse User

it is dangerouse if you have events crossing between the treads, or better fbs triggered by events from different threads.

Re: mutiple cycle using [message #1839402 is a reply to message #1839397]

Sat, 20 March 2021 01:09

Eclipse User

actully, the rt thread has to trigger event of the main thread, otherwise it make no sense

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