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Subject: Re: name resolution performance
From: Kay-Uwe Kasemir <[email protected]>
To: EPICS Core Talk <[email protected]>
Date: Thu, 07 Jul 2005 11:10:29 -0400
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


Replies:
RE: name resolution performance Jeff Hill
References:
name resolution performance Jeff Hill

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