RE: Gateway Crashes

["Jeff Hill" <johill@lanl.gov>]

Title: Message

Steven,

 

I was curious why the GW code might be crashing when it was unable to create a thread. The code should of course just refuse to attach to another client if it runs low on resources.

 

I looked in CVS and it appears that there is a patch to the posix version of the epicsThreadCreate function, first appearing in R3.14.7, which changes a checkStatusQuit macro invocation to a checkStatus macro invocation. The net impact is that, in R3.14.6, if there is any problem creating a thread in the posix version of epicsThreadCreate the thread is suspended inside of epicsThreadCreate, but this is fixed in R3.14.7.

 

Jeff

 

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From: Steven Banks [mailto:steven.banks@synchrotron.vic.gov.au]
Sent: Monday, June 26, 2006 12:57 AM
To: tech-talk@aps.anl.gov
Subject: Gateway Crashes

 

We are having severe problems with the EPICS gateway, and I'm hoping that someone can help us resolve them.

 

The problem is that the gateway is continually crashing whenever we open up a GUI display with requires connection to multiple IOCs.  These are Libera BPM boxes, and we have 98 of them.  We have a status display which shows the status of 33 of these at once.  As we scroll from one display to the other, the gateway invariably crashes.

 

(This is a gateway between our office network and our accelerator network, and is used for monitoring the status of the machine from our desktops.)

 

The gateway log provides the following information:

 

***************************************************************

Jun 26 16:01:02 PV Gateway Version 2.0.0.0 [Jun 14 2006 15:10:22]
EPICS 3.14.6 PID=8840 ServerPID=8839
EPICS_CA_ADDR_LIST=BROADCAST-ACC
EPICS_CA_AUTO_ADDR_LIST=NO
EPICS_CA_SERVER_PORT=Not specified
EPICS_CA_MAX_ARRAY_BYTES=Not specified
EPICS_CAS_INTF_ADDR_LIST=CR01GW01-OFFICE
EPICS_CAS_SERVER_PORT=Not specified
EPICS_CAS_IGNORE_ADDR_LIST=Not specified
Running as user ics on host CR01GW01
Statistics PV prefix is CR01GW01
pthread_create  error Cannot allocate memory

 

Jun 26 16:36:12 !!! Errlog message received (message is above)
fatal error: epicsThreadCreate

 

Jun 26 16:36:12 !!! Errlog message received (message is above)

***************************************************************

 

Has anyone else seen the memory problems that we are experiencing?  Is this an indication that we are trying to connect to too many PVs at once?  Will purchasing more memory for the gateway perhaps alleviate the problem.  It currently has 512MB but we are planning to upgrade it to 1 GB.

 

Dr. Steven M. Banks – Control Systems Engineer
Australian Synchrotron Project
Major Projects Victoria
800 Blackburn Road
CLAYTON VIC 3168
tel: +613 8540 4103
fax: +613 8540 4200

mailto:steven.banks@synchrotron.vic.gov.au
http://www.synchrotron.vic.gov.au