Re: name resolution performance

[Kay-Uwe Kasemir <kasemirk@ornl.gov>]

Hi:

Thanks to Jeff for adding the number.
~60000 lookups (or is it connections?) per second for CA
sure beats the OpenLDAP number of only 1500 lookups/sec
to pulp.

What's harder to measure/test/compare:
When I start a new EDM screen, it connects quickly,
which I guess is because of the 60000/sec.
But when I reboot all ~40 SCL LLRF IOCs,
the screen will often not reconnect for a minute.

Is that because of SNS network misconfiguration?
Is the concept of detecting changes in beacon timing
too tricky, and a straight directory lookup
of where a PV is supposed to be would be quicker?

Thanks,
-Kay

On Jul 6, 2005, at 17:39, Jeff Hill wrote:
> All,
>
> I added the attached text to Kay's name resolution discussion (on the 
> wiki).
>
> Jeff
>
> JOH: For comparison purposes, here is the performance of CA's built-in 
> name
> resolution.
>
> Testing with 100000 channels named joh:bill
> channel connect test
> Elapsed Per Item =   0.00001683 sec,    59427.3 Items per sec, 31.4 
> Mbps
> Search tries per chan - mean=1.000930 std dev=0.030482 min=1.000000
> max=2.000000