IOC warning when connecting to 64 devices

[Abdalla Ahmad via Tech-talk <tech-talk at aps.anl.gov>]

Hi

 

We developed an asyn port driver for a group of power supplies, 64 in total, controlled via Ethernet. When the IOC was developed to connect to all power supplies at once, I got the following warning:

 

callbackRequest: cbLow ring buffer full

 

The IOC became slow and could not handle processing some PVs at .1 second scan. I ended up splitting the main IOC into 4 IOCs each controlling 16 devices and the system is working fine. I would like to know more what causes this warning and is it possible to have 1 IOC controlling all 64 devices?

 

Best Regards,

Abdalla Al-Dalleh

Control Engineer

SESAME