RSM V13.x - Changing the default core allocation on nodes for HPC 2008
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Question: I have 8 cores on each of my nodes in my HPC 2008 cluster but it's only using 4 cores per node why is this? Answer: This is by design. There are two reasons for this: 1.The previous generation of processors do not have enough memory bandwidth to use all 8 processors effectively and you ended up with decreased performance by using all of the processors on a single node at once. The newer processors such as AMD Shanghai and Intel Nehalem do not have this limitation to the same degree. 2.ANSYS Mechanical can use a lot of memory and this can exceed the amount available on many current cluster setup's. The total memory available on the node has to be enough to cover the amount of memory used by each ANSYS process. Increasing the number of nodes means there is more memory available per ANSYS process. Question: Can I change this? Answer: Yes, you can change this by editing the following file: [Drive Letter]Program FilesANSYS Incv120RSMConfigscripts AnsysJob_MSCC.cs And then change the method DecideNumNodes as below. See the Resolution Document below for full instructions. |
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