caget randomly returns Channel connect timed out

[Matt Rippa <mrippa@gemini.edu>]

Hi folks,

We ran a simple caget (once per second) from a linux host to an upgraded IOC. With the new rtems/3.14.12.7 IOC, it often experiences timeouts as shown below. With our legacy vxworks/3.13.9 IOC there are no timeouts logged. Relevant info is shown below. The caRepeater is running on the linux host.

I'm thinking that setting the linux host EPICS_CA_ADDR_LIST=YES may help. I'm running that test now. 

Thank you for any insight,

-Matt 

linux> cat /etc/redhat-release  
CentOS Linux release 7.4.1708 (Core)

linux> uname -a
Linux sbftelops-lv1.cl.gemini.edu 3.10.0-862.el7.x86_64 #1 SMP Fri Apr 20 16:44:24 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

linux> env |grep EPICS
EPICS=/gemsoft/opt/epics
EPICS_BASE=/gemsoft/opt/epics/base
EPICS_HOST_ARCH=linux-x86_64
EPICS_CA_ADDR_LIST=172.17.2.255 172.17.3.255 172.17.102.130 172.17.105.20 172.16.102.130 aom-vme sbfmcao01.cl.gemini.edu mcao-stealth.cl.gemini.edu 172.17.10
6.111 172.17.105.37 172.17.107.50 172.17.55.101 172.17.101.101 172.17.65.255 172.17.102.139 172.17.102.138

linux> caget tcs:ak:astCtx
tcs:ak:astCtx                  0
linux> caget tcs:ak:astCtx
Channel connect timed out: 'tcs:ak:astCtx' not found.
linux> caget tcs:ak:astCtx
Channel connect timed out: 'tcs:ak:astCtx' not found.

linux> caget tcs:ak:astCtx
tcs:ak:astCtx                  0

Our IOC Telescope Control System (TCS) has recently been updated to:

• RTEMS 4.10.2
• EPICS 3.14.12.7
• MVME 2700 (rtems 2307 bsp)

from:

• VxWorks 5.4
• EPICS 3.13.9
• MVME 2700

New IOC Parameters:

tcs-cp-ioc> epicsPrtEnvParams

EPICS_AR_PORT: 7002

EPICS_CAS_AUTO_BEACON_ADDR_LIST is undefined

EPICS_CAS_BEACON_ADDR_LIST is undefined

EPICS_CAS_BEACON_PERIOD is undefined

EPICS_CAS_BEACON_PORT is undefined

EPICS_CAS_IGNORE_ADDR_LIST is undefined

EPICS_CAS_INTF_ADDR_LIST is undefined

EPICS_CAS_SERVER_PORT is undefined

EPICS_CA_ADDR_LIST: 172.17.65.255 172.17.3.40 172.17.102.138

EPICS_CA_AUTO_ADDR_LIST: YES

EPICS_CA_BEACON_PERIOD: 15.0

EPICS_CA_CONN_TMO: 30.0

EPICS_CA_MAX_ARRAY_BYTES: 16384

EPICS_CA_MAX_SEARCH_PERIOD: 300.0

EPICS_CA_NAME_SERVERS is undefined

EPICS_CA_REPEATER_PORT: 5065

EPICS_CA_SERVER_PORT: 5064

EPICS_CMD_PROTO_PORT is undefined

EPICS_IOC_LOG_FILE_COMMAND is undefined

EPICS_IOC_LOG_FILE_LIMIT: 1000000

EPICS_IOC_LOG_FILE_NAME is undefined

EPICS_IOC_LOG_INET is undefined

EPICS_IOC_LOG_PORT: 7004

EPICS_TIMEZONE: UTC::0::

EPICS_TS_NTP_INET is undefined

IOCSH_HISTSIZE: 20

IOCSH_PS1: tcs-cp-ioc> 

--