feat(omp): add lab omp realised during classroom

Student_OMP/src/core/omp/02_Slice/01_pi_sequentiel.cpp

@@ -34,14 +34,14 @@ bool isPiSequentiel_OK(int n)
  \*-------------------------------------*/
 
 double piSequentiel(int n) {
-    const double delta_x = 1 / (double)n;
+    const double dx = 1.0 / (double)n;
     double sum = 0;
     for (int i = 0; i < n; i++) {
-    	double xi = i * delta_x;
+    	double xi = i * dx;
     	sum += fpi(xi);
 	}
 
-    return sum * delta_x;
+    return sum * dx;
     }
 
 /*----------------------------------------------------------------------*\

Student_OMP/src/core/omp/02_Slice/02_pi_entrelacer_promotionTab.cpp

@@ -45,22 +45,20 @@ double piOMPEntrelacerPromotionTab(int n)
     double sum[NB_THREAD];
 
     // Reduction intra thread
-#pragma omp parallel
-    {
+#pragma omp parallel {
 
     const int TID = Omps::getTid();
     int s = TID;
 
     double sum_thread = 0;
 
-    while (s < n)
-	{
-	double xi = s * delta_x;
-	sum_thread += fpi(xi);
-	s += NB_THREAD;
+    while (s < n) {
+    	double xi = s * delta_x;
+    	sum_thread += fpi(xi);
+    	s += NB_THREAD;
 	}
     sum[TID] = sum_thread;
-    }
+}
 
 double sumTotal = 0;
 

Student_OMP/src/core/omp/02_Slice/03_pi_entrelacer_critique.cpp

@@ -37,8 +37,29 @@ bool isPiOMPEntrelacerCritical_Ok(int n)
 
 double piOMPEntrelacerCritical(int n)
     {
-    //TODO
-    return -1;
+    const double dx = 1.0 / (double)n;
+    const int NB_THREAD = Omps::setAndGetNaturalGranularity();
+    int total = 0;
+
+#pragma omp parallel
+    {
+	const int TID = Omps::getTid();
+	int s = TID;
+
+	double sum_thread = 0;
+
+	while (s < n)
+	    {
+	    double xi = s*dx;
+	    sum_thread += fpi(xi);
+	    s+= NB_THREAD;
+	    }
+#pragma omp critical
+	{
+	total += sum_thread;
+	}
+    }
+    return total * dx;
     }
 
 /*----------------------------------------------------------------------*\

Student_OMP/src/core/omp/02_Slice/04_pi_entrelacer_atomic.cpp

@@ -40,8 +40,26 @@ bool isPiOMPEntrelacerAtomic_Ok(int n)
  */
 double piOMPEntrelacerAtomic(int n)
     {
-    // TODO
-    return -1;
+    const double dx = 1.0 / (double)n;
+    const int NB_THREAD = Omps::setAndGetNaturalGranularity();
+    int total = 0;
+
+#pragma omp parallel
+	{
+	const int TID = Omps::getTid();
+	int s = TID;
+	double sum_thread = 0;
+	while (s < n)
+	    {
+	    double xi = s * dx;
+	    sum_thread += fpi(xi);
+	    s += NB_THREAD;
+	    }
+#pragma omp atomic
+	total += sum_thread;
+
+	}
+    return total * dx;
     }
 
 /*----------------------------------------------------------------------*\

Student_OMP/src/core/omp/02_Slice/07_pi_for_promotionTab.cpp

@@ -43,7 +43,18 @@ bool isPiOMPforPromotionTab_Ok(int n)
  */
 double piOMPforPromotionTab(int n)
     {
-    //TODO
+    const double dx = 1.0 / (double)n;
+    const int NB_THREAD = Omps::setAndGetNaturalGranularity();
+    double total[NB_THREAD] = {0.0};
+
+#pragma omp parallel for
+    for(int i = 0; i < n; i++) {
+	const int TID = Omps::getTid();
+//	double xi = s*dx;
+//	total[TID] += fpi(xi);
+    }
+
+
     return -1;
     }
 

Student_OMP/src/core/omp/02_Slice/08_pi_for_reduction.cpp

@@ -41,11 +41,18 @@ bool isPiOMPforReduction_Ok(int n)
  */
 double piOMPforReduction(int n)
     {
-    //TODO
-    return -1;
+    const double dx = 1.0 / (double)n;
+    double sum = 0;
+#pragma omp parallel for reduction(+:sum)
+    for (int i = 0; i < n; i++)
+	{
+	double xi = i * dx;
+	sum += fpi(xi);
+	}
+
+    return sum * dx;
     }
 
 /*----------------------------------------------------------------------*\
  |*			End	 					*|
  \*---------------------------------------------------------------------*/
-