change compile time combination tests

- move Directional Splitting test from laser wakefield to KHI
- add `CELL_WIDTH` precompiler switch in `gridConfig.param`

Author: psychocoderHPC

examples/KelvinHelmholtz/cmakeFlags

@@ -36,6 +36,7 @@ flags[3]="-DCUDA_ARCH=sm_35 -DPARAM_OVERWRITES:LIST=-DPARAM_CURRENTSOLVER=ZigZag
 flags[4]="-DCUDA_ARCH=sm_35 -DPARAM_OVERWRITES:LIST=-DPARAM_CURRENTSOLVER=ZigZag<UsedParticleShape>;-DPARAM_PARTICLESHAPE=PCS"
 flags[5]="-DCUDA_ARCH=sm_35 -DPARAM_OVERWRITES:LIST=-DPARAM_CURRENTSOLVER=ZigZag<UsedParticleShape>;-DPARAM_PARTICLESHAPE=TSC"
 flags[6]="-DCUDA_ARCH=sm_35 -DPARAM_OVERWRITES:LIST=-DPARAM_CURRENTSOLVER=ZigZag<UsedParticleShape>;-DPARAM_PARTICLESHAPE=TSC;-DPARAM_DIMENSION=DIM2"
+flags[7]="-DCUDA_ARCH=sm_20 -DPARAM_OVERWRITES:LIST=-DPARAM_FIELDSOLVER=fieldSolverDirSplitting"
 
 
 ################################################################################

examples/KelvinHelmholtz/include/simulation_defines/param/componentsConfig.param

@@ -50,7 +50,13 @@ namespace picongpu
      *  - fieldSolverYeeNative : generic version of fieldSolverYee
      *    (need more shared memory per GPU and is slow)
      */
-    namespace fieldSolver = fieldSolverYee;
+#ifndef PARAM_FIELDSOLVER
+/* WARNING: if you change field solver by hand please update your CELL_WIDTH_SI
+ * in `gridConfig.param` to fulfill the convergence condition (CFL)
+ */
+#define PARAM_FIELDSOLVER fieldSolverYee
+#endif
+namespace fieldSolver = PARAM_FIELDSOLVER;
 
     /*enable (1) or disable (0) current calculation*/
 #define ENABLE_CURRENT 1

examples/KelvinHelmholtz/include/simulation_defines/param/gridConfig.param

@@ -1,23 +1,23 @@
 /**
  * Copyright 2013-2015 Axel Huebl, Rene Widera, Richard Pausch
  *
- * This file is part of PIConGPU. 
- * 
- * PIConGPU is free software: you can redistribute it and/or modify 
- * it under the terms of the GNU General Public License as published by 
- * the Free Software Foundation, either version 3 of the License, or 
- * (at your option) any later version. 
- * 
- * PIConGPU is distributed in the hope that it will be useful, 
- * but WITHOUT ANY WARRANTY; without even the implied warranty of 
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
- * GNU General Public License for more details. 
- * 
- * You should have received a copy of the GNU General Public License 
- * along with PIConGPU.  
- * If not, see <http://www.gnu.org/licenses/>. 
- */ 
- 
+ * This file is part of PIConGPU.
+ *
+ * PIConGPU is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * PIConGPU is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with PIConGPU.
+ * If not, see <http://www.gnu.org/licenses/>.
+ */
+
 
 
 #pragma once
@@ -32,7 +32,27 @@ namespace picongpu
         const double DELTA_T_SI = 1.79e-16;
         /** equals X
          *  unit: meter */
+#define fieldSolverDirSplitting 1
+#if (PARAM_FIELDSOLVER == 1)
+        /* THIS CODE PATH IS ONLY USED IF `PARAM_FIELDSOLVER` IS CHANGED IN
+         * `cmakeFlags` and the field solver there is set to fieldSolverDirSplitting
+         *
+         * Directional Splitting requires a fixed ratio between dt and dx
+         * and in addition cubic cells.
+         * conditions: dX == dt * c
+         *             dX == dY
+         *             dX == dZ
+         */
+        const double CELL_WIDTH_SI = DELTA_T_SI*SPEED_OF_LIGHT_SI;
+#else
+        /* cell size for Yee solver (must fulfill CFL)
+         * WARNING: if you change the field solver in `componentsConfig` you
+         * have to change the CELL_SIZE in this code path
+         */
         const double CELL_WIDTH_SI = 9.34635e-8;
+#endif
+#undef fieldSolverDirSplitting
+
         /** equals Y - the propagation direction
          *  unit: meter */
         const double CELL_HEIGHT_SI = CELL_WIDTH_SI;
@@ -47,22 +67,22 @@ namespace picongpu
         {32, 32},  /*y direction [negative,positive]*/
         {32, 32}   /*z direction [negative,positive]*/
     }; //unit: number of cells
-    
+
     //! Define the strange of the absober for any direction
     const float_X ABSORBER_STRENGTH[3][2] = {
         {1.0e-3, 1.0e-3}, /*x direction [negative,positive]*/
         {1.0e-3, 1.0e-3}, /*y direction [negative,positive]*/
         {1.0e-3, 1.0e-3}  /*z direction [negative,positive]*/
-    }; //unit: none 
+    }; //unit: none
 
     const uint32_t ABSORBER_FADE_IN_STEPS = 16;
-    
+
     /** When to move the co-moving window.
      *  An initial pseudo particle, flying with the speed of light,
      *  is fired at the begin of the simulation.
      *  When it reaches slide_point % of the absolute(*) simulation area,
      *  the co-moving window starts to move with the speed of light.
-     * 
+     *
      *  (*) Note: beware, that there is one "hidden" row of gpus at the y-front,
      *            when you use the co-moving window
      *  0.75 means only 75% of simulation area is used for real simulation

examples/LaserWakefield/cmakeFlags

@@ -31,17 +31,15 @@
 
 flags[0]="-DCUDA_ARCH=sm_20"
 flags[1]="-DCUDA_ARCH=sm_20 -DPARAM_OVERWRITES:LIST=-DPARAM_FIELDSOLVER=fieldSolverLehe;-DPARAM_PARTICLEPUSHER=Vay"
-flags[2]="-DCUDA_ARCH=sm_20 -DPARAM_OVERWRITES:LIST=-DPARAM_FIELDSOLVER=fieldSolverDirSplitting"
-flags[3]="-DCUDA_ARCH=sm_20 -DPARAM_OVERWRITES:LIST=-DPARAM_CURRENTSOLVER=Esirkepov;-DPARAM_PARTICLESHAPE=CIC"
-flags[4]="-DCUDA_ARCH=sm_20 -DPARAM_OVERWRITES:LIST=-DPARAM_CURRENTSOLVER=VillaBune;-DPARAM_PARTICLESHAPE=CIC"
-flags[5]="-DCUDA_ARCH=sm_20 -DPARAM_OVERWRITES:LIST=-DPARAM_PRECISION=precision64Bit"
-flags[6]="-DCUDA_ARCH=sm_20 -DPARAM_OVERWRITES:LIST=-DPARAM_FIELDSOLVER=fieldSolverDirSplitting;-DPARAM_PRECISION=precision64Bit"
-flags[7]="-DCUDA_ARCH=sm_35 -DPARAM_OVERWRITES:LIST=-DENABLE_CURRENT=0"
-flags[8]="-DCUDA_ARCH=sm_20 -DPARAM_OVERWRITES:LIST=-DPARAM_DIMENSION=DIM2"
-flags[9]="-DCUDA_ARCH=sm_20 -DPARAM_OVERWRITES:LIST=-DPARAM_CURRENTSOLVER=Esirkepov;-DPARAM_PARTICLESHAPE=CIC;-DPARAM_DIMENSION=DIM2"
-flags[10]="-DCUDA_ARCH=sm_20 -DPARAM_OVERWRITES:LIST=-DPARAM_PRECISION=precision64Bit;-DPARAM_DIMENSION=DIM2"
-flags[11]="-DCUDA_ARCH=sm_35 -DPARAM_OVERWRITES:LIST=-DENABLE_CURRENT=0;-DPARAM_DIMENSION=DIM2"
-flags[12]="-DCUDA_ARCH=sm_35 -DPARAM_OVERWRITES:LIST=-DPARAM_IONS=1;-DPARAM_IONIZATION=1"
+flags[2]="-DCUDA_ARCH=sm_20 -DPARAM_OVERWRITES:LIST=-DPARAM_CURRENTSOLVER=Esirkepov;-DPARAM_PARTICLESHAPE=CIC"
+flags[3]="-DCUDA_ARCH=sm_20 -DPARAM_OVERWRITES:LIST=-DPARAM_CURRENTSOLVER=VillaBune;-DPARAM_PARTICLESHAPE=CIC"
+flags[4]="-DCUDA_ARCH=sm_20 -DPARAM_OVERWRITES:LIST=-DPARAM_PRECISION=precision64Bit"
+flags[5]="-DCUDA_ARCH=sm_35 -DPARAM_OVERWRITES:LIST=-DENABLE_CURRENT=0"
+flags[6]="-DCUDA_ARCH=sm_20 -DPARAM_OVERWRITES:LIST=-DPARAM_DIMENSION=DIM2"
+flags[7]="-DCUDA_ARCH=sm_20 -DPARAM_OVERWRITES:LIST=-DPARAM_CURRENTSOLVER=Esirkepov;-DPARAM_PARTICLESHAPE=CIC;-DPARAM_DIMENSION=DIM2"
+flags[8]="-DCUDA_ARCH=sm_20 -DPARAM_OVERWRITES:LIST=-DPARAM_PRECISION=precision64Bit;-DPARAM_DIMENSION=DIM2"
+flags[9]="-DCUDA_ARCH=sm_35 -DPARAM_OVERWRITES:LIST=-DENABLE_CURRENT=0;-DPARAM_DIMENSION=DIM2"
+flags[10]="-DCUDA_ARCH=sm_35 -DPARAM_OVERWRITES:LIST=-DPARAM_IONS=1;-DPARAM_IONIZATION=1"
 ################################################################################
 # execution