{"id":393543,"date":"2024-11-11T09:18:14","date_gmt":"2024-11-11T09:18:14","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/distribute-ram-on-linux-cluster\/"},"modified":"2024-11-11T09:18:14","modified_gmt":"2024-11-11T09:18:14","slug":"distribute-ram-on-linux-cluster","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/distribute-ram-on-linux-cluster\/","title":{"rendered":"Distribute RAM on linux cluster"},"content":{"rendered":"

<p>Good morning,<\/p><p>I have to generate a big mesh (370 million elements) on fluent meshing. I can launch the mesh generation on a remote linux Cluster. The cluster has several computing nodes, each of which has certain number of cores and a certain RAM. When I submit my job, a queue manager assign my job to the free nodes and the job starts. I have the possibility to choose the number of cores and the distribution of cores among nodes. Eg: I can choose to run a job on 30 cores belonging to a single node OR to run a job on 30 cores distrubuted on 3 computing nodes (10 cores for each node). With the second option I should have more available RAM, since each computing node has his own ram (about 250 GB). However, what I see is that when I run my job the largest part of the RAM is allocated to a single node (and not divided between the three nodes). So, the mesh generation fails with an “out of memory” error.<\/p><p>Is there a string to allocate better the RAM and distribute it on different computing nodes? Is there a way to do that from a command line?<\/p><p>Following, my job-submission file<\/p><div>#!\/bin.bash # use bash as command interpreter<\/div><div>#$ -cwd                 # currentWorkingDirectory<\/div><div>#$ -N HCT_mesh        # jobName<\/div><div>#$ -j y                 # merges output and errors<\/div><div>#$ -S \/bin\/bash         # scripting language<\/div><div>#$ -l h_rt=168:00:00    # jobDuration hh:mm:ss<\/div><div>#$ -q nmec.q            # queueName<\/div><div>#$ -pe mpi_10 30        # cpuNumber<\/div><div>#________________________________________________________<\/div><div>\/software\/ansys2023R2\/v232\/fluent\/bin\/fluent 3ddp -t30  -meshing -cnf=machinefile.$JOB_ID -g < inputfile.txt > outputfile.txt <\/div><div>echo End Parallel Run<\/div><p>Thank you very much <\/p><p> <\/p><p>Andrea <\/p><p> <\/p><\/p>\n","protected":false},"template":"","class_list":["post-393543","topic","type-topic","status-publish","hentry","topic-tag-mesh","topic-tag-meshing"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t