Experimental Physics and
Industrial Control System

Dear all:

 I use jcae to monitor 100 PVs of softIoc。 All theses pv value equals a specific pv named trigger plus a constant , and set SCAN=0.1s. To make sure all pv changes every 0.1s， I use pyepics to put a new value to the trigger pv every 0.1s . In my readout program，I monitor all 100 PVs. 

Every 1000s , I calculate all 100 pv update times. Ideally , every 1000s the update times is 100*1000*10. But i only get 999932., which means there are0.0068% update data lost. Then I only montor 50 PVs, this time i get all update data . When I monitor 3000 PVs, the lost ratio is 0.095%. 

  Is that means in one ioc database , if i want get all update data , I only can monitor 50 PVs? Or i don't do the test right?  

  When number of pv is growing, is it normal to lost update data? 

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Re: question about monitering pv by using jcae Ralph Lange via Tech-talk

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