How to configure the CA Workload Automation Agent on Solaris and Linux OS to not set the file descriptors (nofile) limit to the maximum (ulimit -Hn)?
Article ID: 16713
Updated On:
Products
Issue/Introduction
The CA Workload Automation System Agent inherits the resource limits of the user that starts it. Normally, the System Agent is started by init daemon during system boot up or the root user starts the System Agent service up and hence the resource limits for the CA WA Agent is the same as those of the /sbin/init process or the root user, except for the file descriptors (nofiles) values.
In the following examples, notice that the file descriptors for the CA WA System Agent is set to the maximum/hard limit.
On Oracle Solaris:
init process limits
# plimit 1
1: /sbin/init
resource current maximum
time(seconds) unlimited unlimited
file(blocks) unlimited unlimited
data(kbytes) unlimited unlimited
stack(kbytes) 8192 unlimited
coredump(blocks) unlimited unlimited
nofiles(descriptors) 256 65536
vmemory(kbytes) unlimited unlimited
CA WA Agent process limits
# plimit 11149
11149: ./cybAgent.bin -a
resource current maximum
time(seconds) unlimited unlimited
file(blocks) unlimited unlimited
data(kbytes) unlimited unlimited
stack(kbytes) 8192 unlimited
coredump(blocks) unlimited unlimited
nofiles(descriptors) 65536 65536
vmemory(kbytes) unlimited unlimited
On SUSE Linux Enterprise Server 11:
init process limits
# ps -ef | grep "init\s"
root 1 0 0 Aug02 ? 00:03:58 init [5]
# cat /proc/1/limits
Limit Soft Limit Hard Limit Units
Max cpu time unlimited unlimited seconds
Max file size unlimited unlimited bytes
Max data size unlimited unlimited bytes
Max stack size 8388608 unlimited bytes
Max core file size 0 unlimited bytes
Max resident set unlimited unlimited bytes
Max processes 62856 62856 processes
Max open files 1024 4096 files
Max locked memory 65536 65536 bytes
Max address space unlimited unlimited bytes
Max file locks unlimited unlimited locks
Max pending signals 62856 62856 signals
Max msgqueue size 819200 819200 bytes
Max nice priority 0 0
Max realtime priority 0 0
Max realtime timeout unlimited unlimited us
CA WA Agent process limits
# ps -ef | grep "cybA.*a$"
root 13558 1 2 07:26 ? 00:00:03 ./cybAgent.bin -a
#cat /proc/13558/limits
Limit Soft Limit Hard Limit Units
Max cpu time unlimited unlimited seconds
Max file size unlimited unlimited bytes
Max data size unlimited unlimited bytes
Max stack size 8388608 unlimited bytes
Max core file size 1024 unlimited bytes
Max resident set 7012638720 unlimited bytes
Max processes 62856 62856 processes
Max open files 8192 8192 files
Max locked memory 65536 262144 bytes
Max address space 10041098240 unlimited bytes
Max file locks unlimited unlimited locks
Max pending signals 62856 62856 signals
Max msgqueue size 819200 819200 bytes
Max nice priority 0 0
Max realtime priority 0 0
Max realtime timeout unlimited unlimited us
All child processes of the CA WA Agent process inherit the same resource limits from the Agent. This might result in failure or unexpected behavior of jobs that need more file descriptors.
How to configure the CA Workload Automation Agent on Solaris and Linux OS to not set the file descriptors (nofile) limit to the maximum (ulimit -Hn)?
Environment
Resolution
The reported scenario with the System Agent is due to the default Java behavior. Java by default bumps files descriptors (nofiles) to the maximum (hard limit, i.e. ulimit -Hn). To inhibit this behavior, we can use the -XX:-MaxFDLimit command line option of the Java process.
Set the following parameter in the CA WA System Agent agentparm.txt file to honor the aforementioned Java option.
oscomponent.jvm.x.options=-XX:-MaxFDLimit
Restart the CA WA System Agent service for the setting to take effect and notice the file descriptors soft (current) and hard (maximum) limits are different:
On Solaris OS:
# plimit 328
328: ./cybAgent.bin -a
resource current maximum
time(seconds) unlimited unlimited
file(blocks) unlimited unlimited
data(kbytes) unlimited unlimited
stack(kbytes) 8192 unlimited
coredump(blocks) unlimited unlimited
nofiles(descriptors) 256 4096
vmemory(kbytes) unlimited unlimited
On SUSE Linux Enterprise Server 11:
# ps -ef|grep [c]yb
root 3161 1 0 Dec04 ? 00:03:49 ./cybAgent.bin -a
# cat /proc/3161/limits
Limit Soft Limit Hard Limit Units
Max cpu time unlimited unlimited seconds
Max file size unlimited unlimited bytes
Max data size unlimited unlimited bytes
Max stack size 10485760 unlimited bytes
Max core file size 0 unlimited bytes
Max resident set unlimited unlimited bytes
Max processes 30445 30445 processes
Max open files 4096 10240 files
Max locked memory 65536 65536 bytes
Max address space unlimited unlimited bytes
Max file locks unlimited unlimited locks
Max pending signals 30445 30445 signals
Max msgqueue size 819200 819200 bytes
Max nice priority 0 0
Max realtime priority 0 0
Max realtime timeout unlimited unlimited us
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