Yue Zhu

Thanks for you quick reply. I checked the shared memory folder on the nodes. They do have the folder. For the multiple process on same node, I mean multiple ranks...

Thanks for your reply. Below are the commands I used for creating and deleting files in /dev/shm srun -N 4 -n 4 touch /dev/shm/test.txt srun -N 4 -n 4 echo...

Thanks for your reply. Yes. All nodes have the /dev/shm folder. The follow is the information of /dev/shm folder. Filesystem Size Used Avail Use% Mounted on tmpfs 126G 6.6M 126G...

Many thanks for all your kind helps. I think the problem is caused by the redundant _hostfile_ parameters when running mpi on cluster. Right now, my problem has been solved....

Many thanks for you reminder. You are right. I only get 4 processes on one node. We don't need hostfile on OpenMPI when running on multiple nodes, but hostfile seems...