why rCo**Rcv thread is abnormally high

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why rCo**Rcv thread is abnormally high

why rCo**Rcv thread is abnormally high?

- I create 2 participant,the domain id are 1,21.  I found that the internal threads( rCo**Rcv ) of the DDS were abnormally high, and there was no receiving or sending at the moment

- The program restarts and returns to normal

- As shown in the figure

 
(Flame Graph) As shown in the figure:
which show RTINetioReceiver_receiveFast fuction took a lot of time