Using parallel callback and callback queue overlow

["Kim, Kukhee via Core-talk" <core-talk at aps.anl.gov>]

Hi Michael and Everyone,

I am trying to use parallel callback for a bunch ( < 500 PVs ) of high rate ~ 100Hz record prcessing.

The record processing is just simple value update using SCAN=I/O Intr, and a driver software calls scanIoRequest() when the data is ready.

It worked well for several hours then, suddenly stops working with callback queue overflow: the highwater mark and  the item in queue exceed the length of queue.

Since, the record processing is simple value update, no database logic after the record pressing, I could not imagine  a deadlock comes from the record processing.

I am welcome your advice about the parallel callback.

Thank you.

Best regards,

Kukhee

Kukhee Kim | Engineering Physicist  Advanced Controls Department  SLAC National Accelerator Laboratory | Menlo Park, CA  p: 650.926.4912 | m: 669.300.8192 | email: khkim at slac.stanford.edu