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be238b4bb0
Adding walltime for multinode + keeping temporary folder activated with environement variable bos #37471: fix compilation on Windows operating system. Note that SMESH_Gen::send_mesh current implementation is vetoed on windows OS (system call)
107 lines
2.5 KiB
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107 lines
2.5 KiB
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.. _parallel_compute_page:
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******************
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Parallel Computing
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******************
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.. warning::
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This functionality is a work in progress.
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It is only available for NETGEN.
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It is only available in TUI.
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The goal here is to speed up computation by running sub-meshes in parallel
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(multi-threading).
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*******
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Concept
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*******
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.. image:: ../images/diagram_parallel_mesh.png
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In order to parallelise the computation of the mesh we split the geometry into:
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* A 1D+2D compound
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* A list of 3D solids
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Then create a sub-mesh for each of those geometry.
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And associate Hypothesis to the mesh using a hypothesis on the whole geometry
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We will first compute sequentially the 1D+2D compound with NETGEN_1D2D.
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Then we will compute all the solids in parallel. Having done the 1D+2D first
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ensure that all the solids can be computed without any concurrency.
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******
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How to
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******
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You follow the same principle as the creation of a sequential Mesh.
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1. First you create the mesh:
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.. code-block:: python
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par_mesh = smesh.ParallelMesh(my_geom, name="par_mesh")
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2. Define the Global Hypothesis that will be split into an hypothesis for the
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1D+2D compound and one for each of the 3D solids:
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.. code-block:: python
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NETGEN_3D_Parameters_1 = smesh.CreateHypothesisByAverageLength( 'NETGEN_Parameters',
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'NETGENEngine', 34.641, 0 )
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par_mesh.AddGlobalHypothesis(NETGEN_3D_Parameters_1)
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3. Set the method for the parallelisation:
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You have two methods for parallelisation:
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* Multihtreading: Will run the computation on your computer using the processors on your computer.
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.. code-block:: python
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par_mesh.SetParallelismMethod(smeshBuilder.MULTITHREAD)
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* MultiNodal: Will run the computation on a remote resource (cluster) that is defined in your salome catalog.
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.. code-block:: python
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par_mesh.SetParallelismMethod(smeshBuilder.MULTINODE)
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4. Set the parameters for the parallelism:
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* Multithread:
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.. code-block:: python
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param = par_mesh.GetParallelismSettings()
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param.SetNbThreads(6)
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* Multinode:
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.. code-block:: python
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param = par_mesh.GetParallelismSettings()
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param.SetResource("cronos")
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param.SetNbProc(nbox**3)
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param.SetNbProcPerNode(2)
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param.SetNbNode(6)
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param.SetWcKey("P11N0:SALOME_COFEE")
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5. Compute the mesh:
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.. code-block:: python
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is_done = par_mesh.Compute()
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if not is_done:
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raise Exception("Error when computing Mesh")
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**See Also** a sample script of :ref:`tui_create_parallel_mesh`.
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