RE: number of monitors

["Matej Sekoranja" <matej.sekoranja@ijs.si>]

Hi,

> We have a client application that saves, compares and restores machine
values.
> As part of the compare feature it maintains channel access monitors to the
desired PVs .
> As the number of requested PVs increased, the performance slowed down
(somewhere > 2000
> PVs it became noticeable). Do other people have applications that
> maintain 1000's of monitors without slowdown ?

> This is a Java app, that uses JCA 2.1.5 for channel access, and displays
results in JTables.
> I'm wondering if the problem is in the design choice of using monitors, or
something else.

I've improved performance of JCA 2.1.5 a little but, so I recommend to wait
for 2.1.6.
Also try to use CAJ 1.0.1 or even better wait for 1.0.2 (string array
problem fixed) and/or 1.0.3 containing some performance improvements (I
still have some ideas).

You mentioned 1000+ PVs in a JTable. Did you identified a bottleneck - is it
JCA or JTable?
GUI performance is not one of Java strengths. There are also some tricks to
improve JTable performance
(knowing JTable update behavior you can decrease table updates).

Regards,
	Matej