Fluent runs on a Windows HPC Cluster with several compute nodes.
If a critical number cores are used the time per iteration increases.
With the same critical number of cores the saving of a dat file can take several hours.
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Make sure that Hyperthreading is disabled on all nodes of the cluster. Depending on the case it is possible that Hyperthreading almost doubles the time for each iteration compared with a simulation with half the number of cores (e.g. 72 HT-cores compared to 36 real cores). The time to write a dat file during a simulation should not change much if Hyperthreading is disabled. Active Hyperthreading can increase the time to write a dat file on a cluster by a factor between 4 and 50. This behavior with active Hyperthreading can only be observed when a sufficient number of cores is used. The exact number may depend on the case and the cluster configuration. It is recommended to disable Hyperthreading for all Fluent calculations. |
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