We are running EPICS 3.14.10 on ARM based system. Our device driver is
using asyn driver.
There are several records that are processed on I/O intr SCAN. Sometimes
the I/O rate is quite high and the system load (CPU) goes over the top,
with high (> 3.0) loadavg. When this happens IOC is sluggish to respond
to any CA requests.
Even if we manage to 'disable' the processing inside the device driver
(in terms that no new data is written to record buffers, I/O intr
SCANing still active), it takes quite some time to process all the
pending requests already in the ring buffers for the corresponding record.
Only then can we successfully use the CA to set/get any other PV on the
IOC, and not worry about the delayed response and/or timeouts.
Is there a way to tell IOC or a PV record to forget the pending
events/requests in its ring buffer (eg. some kind of flush)?
This way we could be sure that the IOC will be responding in timely
fashion, when we try to access some PV, and avoid waiting for the ring
buffer to empty by itself..
Has anyone dealt with similar situation?
Any comments and suggestions are welcomed!
Technical support software engineer
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