A SharedMemoryBuffer timeout exception occurs when you start the SAS OnDemand Decision Engine. When this exception happens, the following message is written to the console.log file:

In addition, this error is written to the SAS^® log:

To resolve this issue, increase the Linux kernel's semaphore parameters to the following values:

• Maximum number of semaphores per array (SEMMSL) = 250
• Maximum semaphores system-wide (SEMMNS) = 32000
• Maximum operations per semop call (SEMOPM) = 32
• Maximum number of arrays (SEMMNI) = 380

You can check the current values by running this command:

To change the values, add the following line to the /etc/sysctl.conf file: 

kernel.sem=250 32000 32 380

If a KERNEL.SEM= line already exists in the /etc/sysclt.conf file and any of the values are lower than shown above, increase those values.

You can run the following command as the root user to force the new values to become effective immediately. Otherwise, the new parameter values take effect after the next reboot.