Experimental Physics and
Industrial Control System

Bruno Coudoin <[email protected]> · Thu, 09 Jul 2009 16:17:11 +0200

Le jeudi 09 juillet 2009 à 08:54 -0400, Dalesio, Leo a écrit :
> Perhaps I was not clear --
> 
> What if the client is trying to do something very slow with the
>  monitors and is NOT consuming them at the same rate that the
>  server is creating them.
> 
> This is the reason that rsrv for the EPICS database needs to 
> start overwriting the last thing on the queue. It does not let
>  the queue get over some specified size. If you just keep allocating
>  memory and the client is not consuming the data fast enough, you
>  use up your memory and eventually crash the system. At least I 
> would expect this. It is likely a good idea to put something in
>  to prevent this.

I also had this case in mind but this is handled internally by the CAS
send process. If I understood it well, it just discards the new provided
GDD if the Queue for a particular client is full. Anyway, the memory
usage stay under control because the queue is limited.

Bruno.

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System