Dynamic resource allocation for efficient parallel CFD simulations
CFD users of supercomputers usually resort to rule-of-thumb methods to select the number of subdomains (partitions) when relying on MPI-based parallelization. One common approach is to set a minimum number of elements or cells per subdomain, under which the parallel efficiency of the code is “known”...
| Autores: | , , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2022 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/369349 |
| Acceso en línea: | https://hdl.handle.net/2117/369349 https://dx.doi.org/10.1016/j.compfluid.2022.105577 |
| Access Level: | acceso abierto |
| Palabra clave: | Resource allocation Computational fluid dynamics Supercomputers CFD High performance computing Elastic computing Parallel efficiency MPI Assignació de recursos Dinàmica de fluids computacional Supercomputadors Àrees temàtiques de la UPC::Informàtica::Arquitectura de computadors |
| Sumario: | CFD users of supercomputers usually resort to rule-of-thumb methods to select the number of subdomains (partitions) when relying on MPI-based parallelization. One common approach is to set a minimum number of elements or cells per subdomain, under which the parallel efficiency of the code is “known” to fall below a subjective level, say 80%. The situation is even worse when the user is not aware of the “good” practices for the given code and a huge amount of resources can thus be wasted. This work presents an elastic computing methodology that adapts at runtime the resources allocated to a simulation automatically. The criterion to control the required resources is based on a runtime measure of the communication efficiency of the execution. According to some analytical estimates, the resources are then expanded or reduced to fulfill this criterion and eventually execute an efficient simulation. |
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