Kernel configuration

WebSphere® MQ uses semaphores, shared memory, and file descriptors, and it is probable that the default kernel configuration is not adequate.

Before installation, review the machine's configuration. To do this type the following commands as root:
modload -p sys/msgsys
modload -p sys/shmsys
modload -p sys/semsys
sysdef -p
Compare the output with the values below.
Figure 1. Setting kernel parameter values on a Solaris system

Values for Solaris 9

  set shmsys:shminfo_shmmax=4294967295
  set semsys:seminfo_semmni=1024
  set semsys:seminfo_semaem=16384
  set semsys:seminfo_semvmx=32767
  set semsys:seminfo_semmns=16384
  set semsys:seminfo_semmsl=100
  set semsys:seminfo_semopm=100
  set semsys:seminfo_semmnu=16384
  set semsys:seminfo_semume=256
  set msgsys:msginfo_msgmni=50
  set msgsys:msginfo_msgmax=4096
  set msgsys:msginfo_msgmnb=65535 

Values for Solaris 8

  set shmsys:shminfo_shmseg=1024
  set semsys:seminfo_semmap=1026
  set msgsys:msginfo_msgmap=1026
To change the values, add a set parameter=value lines to the /etc/system file as shown above and reboot the system. For further information on setting up the system, see the Solaris Tunable Parameters Reference Manual for your release of Solaris.
Note:
  1. These values are suitable for running WebSphere MQ, other products on the system may require higher values.
  2. Do not change the value of shmmin from the system default value.
  3. Semaphore and swap usage does not vary significantly with message rate or persistence.
  4. WebSphere MQ queue managers are generally independent of each other. Therefore system kernel parameters, for example shmmni, semmni, semmns, and semmnu need to allow for the number of queue managers in the system.
  5. You need to set the kernel parameters set msgsys:msginfo_msgmap, msgsys:msginfo_msgmax and set msgsys:msginfo_msgmnb only if you are using linear logging. You also need to set set msgsys:msginfo_msgtql to the maximum number of log files that may be used on the system, this is the number of primary and secondary logs added together for all queue managers.

System Resource Limits

Set the system resource limit for data segment and stack segment to unlimited using the following commands in a command prompt:
unlimit -d unlimited
unlimit -s unlimited