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

Subject: Re: Gateway Crashes
From: Dirk Zimoch <dirk.zimoch@psi.ch>
To: Steven Banks <steven.banks@synchrotron.vic.gov.au>
Cc: tech-talk@aps.anl.gov
Date: Mon, 26 Jun 2006 09:47:00 +0200
Steven,

when pthread_create() fails, it is probably a problem with stack space rather than heap. Each thread gets its own stack space in 2 of the 4 GB address space of a 32bit machine. This results in a limitation in the number of threads, i.e. the number of IOCs, the gateway can conenct to.

Solution: reduce the stack size for each thread:
ulimit -s 4096

BTW: You can get the same problem with any CA client which connects to many IOCs.

Dirk


Steven Banks wrote:
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 <http://www.synchrotron.vic.gov.au/>


-- Dr. Dirk Zimoch Swiss Light Source Paul Scherrer Institut Computing and Controls phone +41 56 310 5182 fax +41 56 310 4413

References:
Gateway Crashes Steven Banks

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