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"External event queue is full, external event dropped!" in forte console [message #1809421]

Tue, 16 July 2019 04:24

joy woo

Messages: 146
Registered: May 2019

Senior Member

plz tell me some details in which situation this error appears?
and why cg_nEventChainExternalEventListSize =10 is set?
thanks

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Re: "External event queue is full, external event dropped!" in forte console [message #1809431 is a reply to message #1809421]

Tue, 16 July 2019 06:55

Alois Zoitl

Messages: 1029
Registered: January 2014

Senior Member

Most of the time it means that you have a user defined FB that either blocks or crashes. The external event queue is a queue where events coming from outside of the resource are queued while an FB is executing. As soon as the FB has finished these events are transferred to the internal event queue. It is a special implementation of a kind of lock free algorithm. Which improved 4diac FORTE execution performance by about 40%. For most applications the value of 10 is sufficient. You can experiment with higher values. But normally this just leads to a delay of the error and mostly does not solve the root cause.

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Re: "External event queue is full, external event dropped!" in forte console [message #1809432 is a reply to message #1809431]

Tue, 16 July 2019 07:09

joy woo

Messages: 146
Registered: May 2019

Senior Member

Mr. Zoitl, so early!
Can a E_CYCLE with interval 1s with monitor and watching enabled lead this problem?

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Re: "External event queue is full, external event dropped!" in forte console [message #1809453 is a reply to message #1809432]

Tue, 16 July 2019 11:26

Alois Zoitl

Messages: 1029
Registered: January 2014

Senior Member

Depends on the device you are running 4diac FORTE on. But I wouldn't expect that. Because with a 1s E_CYCLE it would mean that you have an FB that is blocking at least 10s. That sounds more like a bigger issue. Do you have any other external event FBs (e.g., Subscribe)?

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Re: "External event queue is full, external event dropped!" in forte console [message #1809472 is a reply to message #1809453]

Tue, 16 July 2019 15:24

joy woo

Messages: 146
Registered: May 2019

Senior Member

no subscribe, using websocket to connect to forte, i'll check it then give you a feedback later

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Re: "External event queue is full, external event dropped!" in forte console [message #1809491 is a reply to message #1809472]

Tue, 16 July 2019 20:15

Alois Zoitl

Messages: 1029
Registered: January 2014

Senior Member

4diac FORTE officially currently does not support web-socket. Therefore it would be interesting how you integrated web-sockets. Could it be that this is blocking your 4diac FORTE?

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