Experimental Physics and
Industrial Control System
| 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 <2011> 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 | Index | 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 <2011> 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 |
| <== Date ==> | <== Thread ==> |
|---|
| Subject: | RE: CA issues on Linux |
| From: | "Jeff Hill" <[email protected]> |
| To: | "'Cid, Florencio A'" <[email protected]>, <[email protected]> |
| Date: | Thu, 1 Sep 2011 12:11:00 -0600 |
Some possible causes of trouble in this situation: 1) There are multiple soft IOCs on this host _and_ EPICS_CA_AUTO_ADDR_LIST=NO _and_ the host IP for this host is in EPICS_CA_ADDR_LIST (this is a know limitation of typical ip kernels – see the CA ref manual). The only workaround currently is to configure clients to use broadcast when there are multiple soft iocs on one host, or alternatively to only run one soft ioc per host. I have also implemented multicast support that fixes this issue, but the changes haven’t yet been merged it into a released version. 2) There are some routing level issues – type “netstat –r” 3) A local firewall is blocking the client’s search requests to port 5064, the soft IOC’s search responses to the client’s dynamically assigned port, or the client’s TCP connect requests. 4) Something is amiss with CA’s auto configuration of its search address list (EPICS_CA_AUTO_ADDR_LIST=YES) on this version of linux. This can be investigated by calling the ca_client_status fuinction, passing a high interest level magnitude, from the test code. 5) Issues with the exact spelling of the PV name 6) A higher priority thread (than the ca server) in the soft IOC is using all of the cpu. Jeff Message content: TSPA With sufficient thrust, pigs fly just fine. However, this is not necessarily a good idea. It is hard to be sure where they are going to land, and it could be dangerous sitting under them as they fly overhead. -- RFC 1925 From: [email protected] [mailto:[email protected]] On Behalf Of Cid, Florencio A Hi all, I have an IOC running on a Linux PC (Redhat Enterprise 16.1). But, I am having difficulty getting a test CA client (running on the same Linux PC) to communicate with the IOC. Below are the errors being observed upon invoking the CA client. [control@control linux-x86_64]$ ./caExample controlHost:floRec1 CA.Client.Exception............................................... Warning: "User specified timeout on IO operation expired" Context: "ca_pend_io failure" Source File: ../caExample.c line 20 Current Time: Thu Sep 01 2011 10:29:54.965120461 .................................................................. CA.Client.Exception............................................... Warning: "Virtual circuit disconnect" Context: "ca_get failure" Source File: ../caExample.c line 21 Current Time: Thu Sep 01 2011 10:29:54.965502001 .................................................................. controlHost:floRec1 0.000000 CA.Client.Exception............................................... Warning: "User specified timeout on IO operation expired" Context: "ca_pend_io failure" Source File: ../caExample.c line 22 Current Time: Thu Sep 01 2011 10:29:59.965721981 .................................................................. I tried searching the tech-talk archives, but couldn’t find anything related. Any info/assistance will be greatly appreciated. Thanks in advance, F. Cid |
- Replies:
- RE: CA issues on Linux Cid, Florencio A
- References:
- CA issues on Linux Cid, Florencio A
- Navigate by Date:
- Prev: RE: CA issues on Linux Mark Rivers
- Next: RE: CA issues on Linux Cid, Florencio A
- Index: 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 <2011> 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024
- Navigate by Thread:
- Prev: RE: CA issues on Linux Mark Rivers
- Next: RE: CA issues on Linux Cid, Florencio A
- Index: 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 <2011> 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024
·
Home
·
News
·
About
·
Base
·
Modules
·
Extensions
·
Distributions
·
Download
·
· Search · EPICS V4 · IRMIS · Talk · Bugs · Documents · Links · Licensing ·