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<== Date ==> <== Thread ==>

Subject: more portable server performance data
From: "Jeff Hill" <johill@lanl.gov>
To: "Ken Evans" <evans@aps.anl.gov>
Cc: "Bob Dalesio" <ldalesio@lanl.gov>, "Marty Kraimer" <mrk@aps.anl.gov>, "Andrew Johnson" <anj@aps.anl.gov>, "Eric Norum" <eric.norum@usask.ca>, "Ralph Lange" <Ralph.Lange@mail.bessy.de>, <core-talk@aps.anl.gov>
Date: Wed, 6 Nov 2002 18:16:40 -0700
Hi Ken,

Another bit of data. I see a higher maximum event rate limit when I
reverse the situation and run the example portable server on Linux and
the caEventRate program on windows. This seems to be 100% limited by CPU
consumption of the portable server on Linux, but we may also be
approaching the limits imposed by the bandwidth of the network card and
its driver on this particular PC based Linux system.

100 KHz * ( 16 byte CA header plus 8 bytes data ) = 2.4 MBps = 19.2 Mbps

D:\users\hill\epicsDvl\epics\base>caEventRate joh:jane 20000
Connecting to CA Channel "joh:jane". done.
Subscribing 20000 times. done.
Waiting for initial value events. done.
CA Event Rate (Hz): current 98703.3 mean 98703.3 std dev 0
CA Event Rate (Hz): current 93732.1 mean 96217.7 std dev 2485.61
CA Event Rate (Hz): current 96662.2 mean 96365.9 std dev 2040.28
CA Event Rate (Hz): current 96883 mean 96495.2 std dev 1781.06

Jeff
__________________________________________________________
Jeff Hill                     Internet     johill@lanl.gov
LANL MS H820                  Voice        505 665 1831
Los Alamos NM 87545 USA       FAX          505 665 5107



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