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<== Date ==> <== Thread ==>
Subject: Starting multiple SNL programs
From: "Andrew C. Starritt" <[email protected]>
To: "EPICS Tech Talk ([email protected])" <[email protected]>
Date: Wed, 18 Mar 2009 11:42:09 +1100
Hi all,
 
On a couple of IOCs, in the st.cmd file I start a number (7 or 9) SNL
programs (well actually each IOC it is the same SNL program – with option +r
and parameterised).
 
Sometimes one or more random-ish instance fails to connect to
all the PVs and essentially hangs. If I seqStop and restart the
hung sequence program it runs as expected okay.
 
I have some questions which I hope can get help with.
 
The output from seqShow is:
    Program Name         Thread ID  Thread Name          SS Name
    sncControl_Selection 0x32a75a0  sncControl_Selection cycle_magnets
    sncControl_Selection 0x32a2d70  sncControl_Selection cycle_magnets
    sncControl_Selection 0x32a4580  sncControl_Selection cycle_magnets
    sncControl_Selection 0x32a5d90  sncControl_Selection cycle_magnets
    sncControl_Selection 0x32aa5c0  sncControl_Selection cycle_magnets
    sncControl_Selection 0x32abfe0  sncControl_Selection cycle_magnets
    sncControl_Selection 0x32a8a30  sncControl_Selection cycle_magnets
 
Is there an easy way to tell which instance is which?
Can I some how parameterise the program name, thread name or SS Name?
I tried:
 
   program sncControl_Selection{NAME}
 
and
 
   ss cycle_magnets{NAME}
 
in the .stt file but neither would even compile.
 
 
I also observed that the initial hang-up can is avoided by adding some
sort of delay between the seq calls, e.g.:
 
seq (sncControl_Selection,"NAME=SR03ID01, ILK_NAME=SR03II01")
dbl * > /tmp/xx
seq (sncControl_Selection,"NAME=SR04ID01, ILK_NAME=SR04II01")
dbl * > /tmp/xx
seq (sncControl_Selection,"NAME=SR05ID01, ILK_NAME=SR05II01")
dbl * > /tmp/xx
 
 
I have seen this on both epics base 3.14.8.2 with seq-2.0.11 on 4 year old
redhawk Linux system and using epics base 3.14.9 with seq-2.0.11 on a newish
CentOs 5.1 system. Any thoughts as to what is happening?
 
If the only solution is a small delay, is there a standard IOC shell sleep
command I could use instead?
 
 
 
Regards
Andy
 
 
Andrew Starritt, Principal Controls Engineer, Australian Synchrotron
800 Blackburn Road, Clayton, Victoria 3168
ph: (03) 8540 4164 , fax: (03) 8540 4200
mailto:[email protected],  http://www.synchrotron.org.au
 
 
 
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Replies:
Re: Starting multiple SNL programs Emmanuel Mayssat
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