mpid: Cannot create shared memory segment of of <size> bytes
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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 |
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