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| <== Date ==> | <== Thread ==> |
|---|
| Subject: | question about monitering pv by using jcae |
| From: | 刘双雨 via Tech-talk <tech-talk at aps.anl.gov> |
| To: | tech-talk at aps.anl.gov |
| Date: | Tue, 30 Jun 2020 09:00:48 +0800 (GMT+08:00) |
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?