Re: [Libmesh-users] Using multi-core in execution files

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  Thanks for your reply, David. 

  I tried to the command "mpirun -np N" in the RB example 5, but there was a problem that the same code is running repeatedly as follows. 
  ============================================================================================ 
  $ mpirun -np 3 ./example-opt 
  ... 
  (skip) 
  ... 

  ---- Performing Greedy basis enrichment ---- 

  ---- Basis dimension: 0 ---- 
  Performing RB solves on training set 
  Maximum error bound is 90.1602 

  Performing truth solve at parameter: 
  load_Fx: -3.274396e+00 
  load_Fy: -4.127732e+00 
  load_Fz: 9.887087e-01 
  point_load_Fx: -4.856018e+00 
  point_load_Fy: -4.622528e+00 
  point_load_Fz: 4.774231e+00 
  x_scaling: 1.146354e+00 

  ---- Performing Greedy basis enrichment ---- 

  ---- Basis dimension: 0 ---- 
  Performing RB solves on training set 
  Maximum error bound is 90.1602 

  Performing truth solve at parameter: 
  load_Fx: -3.274396e+00 
  load_Fy: -4.127732e+00 
  load_Fz: 9.887087e-01 
  point_load_Fx: -4.856018e+00 
  point_load_Fy: -4.622528e+00 
  point_load_Fz: 4.774231e+00 
  x_scaling: 1.146354e+00 

  ---- Performing Greedy basis enrichment ---- 

  ---- Basis dimension: 0 ---- 
  Performing RB solves on training set 
  Maximum error bound is 90.1602 

  Performing truth solve at parameter: 
  load_Fx: -3.274396e+00 
  load_Fy: -4.127732e+00 
  load_Fz: 9.887087e-01 
  point_load_Fx: -4.856018e+00 
  point_load_Fy: -4.622528e+00 
  point_load_Fz: 4.774231e+00 
  x_scaling: 1.146354e+00 

  Enriching the RB space 
  Enriching the RB space 
  Updating RB matrices 
  Updating RB matrices 
  Updating RB residual terms 
  Updating RB residual terms 
  Enriching the RB space 
  Updating RB matrices 
  Updating RB residual terms 

  ---- Basis dimension: 1 ---- 
  Performing RB solves on training set 

  ---- Basis dimension: 1 ---- 
  Performing RB solves on training set 
  Maximum error bound is 337.302 

  Performing truth solve at parameter: 
  load_Fx: -1.545951e-01 
  load_Fy: -2.327825e+00 
  load_Fz: 3.578962e+00 
  point_load_Fx: 8.882769e-01 
  point_load_Fy: 5.864229e-01 
  point_load_Fz: 4.982374e+00 
  x_scaling: 1.228777e+00 

  Maximum error bound is 337.302 

  Performing truth solve at parameter: 
  load_Fx: -1.545951e-01 
  load_Fy: -2.327825e+00 
  load_Fz: 3.578962e+00 
  point_load_Fx: 8.882769e-01 
  point_load_Fy: 5.864229e-01 
  point_load_Fz: 4.982374e+00 
  x_scaling: 1.228777e+00 

  ---- Basis dimension: 1 ---- 
  Performing RB solves on training set 
  Maximum error bound is 337.302 

  Performing truth solve at parameter: 
  load_Fx: -1.545951e-01 
  load_Fy: -2.327825e+00 
  load_Fz: 3.578962e+00 
  point_load_Fx: 8.882769e-01 
  point_load_Fy: 5.864229e-01 
  point_load_Fz: 4.982374e+00 
  x_scaling: 1.228777e+00 

  Enriching the RB space 
  Updating RB matrices 
  Enriching the RB space 
  Updating RB matrices 
  Updating RB residual terms 
  Updating RB residual terms 
  Enriching the RB space 
  Updating RB matrices 
  Updating RB residual terms 

  ---- Basis dimension: 2 ---- 
  Performing RB solves on training set 

  ---- Basis dimension: 2 ---- 
  Performing RB solves on training set 
  Maximum error bound is 469.21 

   ... 
   (skip) 
   ... 

  ---- Basis dimension: 15 ---- 
  Performing RB solves on training set 

  ---- Basis dimension: 15 ---- 
  Performing RB solves on training set 

  ---- Basis dimension: 15 ---- 
  Performing RB solves on training set 
  Maximum error bound is 2.50754 

  Maximum number of basis functions reached: Nmax = 15 
  *** Warning, This code is deprecated, and likely to be removed in future library versions! ./include/libmesh/mesh_tools.h, line 70, compiled Aug 25 2017 at 02:15:21 *** 
  Maximum error bound is 2.50754 

  Maximum number of basis functions reached: Nmax = 15 
  *** Warning, This code is deprecated, and likely to be removed in future library versions! ./include/libmesh/mesh_tools.h, line 70, compiled Aug 25 2017 at 02:15:21 *** 

    (end) 

  ==================================================================================================================================================== 
  Other examples had the same problem, too. 
  Did I type the command wrong? If not, I want to know what is wrong. 

  Best regards, 
  Kang 

   ----- Original Message -----
From: David Knezevic &lt;dav...@ak...&gt;
To: "S. Kang" &lt;ss...@pu...&gt;
Cc: Libmesh user group &lt;lib...@li...&gt;
Date: Mon, 12 Feb 2018 22:28:09 +0900 (GMT)
subject: Re: [Libmesh-users] Using multi-core in execution files 

     Hello, 

      You can run the reduced basis code in parallel. You do it just the same way that you run any other libMesh code in parallel, i.e. just run with "mpirun -np N" where N specifies the number of processors that you want to use. 

      If you want more info on the parallelization approach that is used, please refer to 
     this paper. 

      Best, 

      David 

       On Sun, Feb 11, 2018 at 9:30 PM, S. Kang 
      &lt;ss...@pu...&gt; wrote: 

   Hello everyone, 

   I am solving RB problems, but it takes too long because of many basis vectors. 

   So, similar to "make -j 10", I want to know how to use multi-core in execution files, not parallel programming. 

   Best regards, 

   S. Kang. 

 ------------------------------ 
       ------------------------------ 

 Shinseong Kang 

 Graduate Student 

 Pusan National University, South Korea 

 H.P.: 010-9770-6595 

 E-mail: 
       ss...@pu... 

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