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

Subject: CA Connect rates under RTEMS
From: wnolan <wnolan@bnl.gov>
To: tech-talk@aps.anl.gov
Date: Tue, 18 Jan 2005 13:14:30 -0500
Hi all, 
I was curious what sort or rates are being observed using the catime
utility for RTEMS installations. 

On a mvme2307 under RTEMS 4.6.2 running EPICS 3.14.6 I am seeing a
extream slowdown from our VX works installations and was wondering if it
was tyipical. 

--- Test data 
Same Hardware
MVME2307
1x OMS VME58
1x Jerger VSC16
1x ACROMAG AVME9440
 and process database( about 30 records ), no state programs running. 
targeting a calc input field for 10000 connections. 
VX-works gives 
channel connect test
Elapsed Per Item =   0.00031412 sec,     3183.5 Items per sec, 1.8 Mbps
Search tries per chan - mean=1.010000 std dev=0.099499 min=1.000000
max=2.000000

RTEMS gives 
channel connect test
Elapsed Per Item =   0.00358250 sec,      279.1 Items per sec, 0.2 Mbps
Search tries per chan - mean=2.210500 std dev=1.631377 min=1.000000
max=8.000000

-------------

I am also seeing the slowdown on ASYN Get tests 
VX works seems to run about 6 Mbps where in the same test RTEMS is
running at about 1 Mbps 

A factor of 10 on channel connect and a factor of 6 on Asyn Get's 

Sync gets are running at about the same rate under both systems , just
under 1 Mbps 

Any help, Pointers or comparative data would be a help,

Bill Nolan 
wnolan@bnl.gov






Replies:
Re: CA Connect rates under RTEMS Eric Norum
Re: CA Connect rates under RTEMS Till Straumann

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