mpid: Cannot create shared memory segment of of bytes
Problem Description: When running FLUENT on a large number of processors and you are using HPMPI on a Linux cluster the job fails with the following error message 'mpid: Cannot create shared memory segment of <size> bytes' and the job eventually fails dumping the core. HPMPI uses shared memory for communications between processes on the same node and may attempt to allocate a shared-memory segment that is larger than the operating system allows.
Resolution: To increase the maximum allowed shared memory segment size, enter the following command as root:
# /sbin/sysctl -w kernel.shmmax=< size in bytes >
To have changes to the kernel.shmmax setting persist after a reboot, add the line:
kernel.shmmax=< size in bytes >
to the /etc/sysctl.conf file