diff --git a/PoissonSolver/2D-seq/poisson.par b/PoissonSolver/2D-seq/poisson.par
index 08ce202..cbda8a2 100644
--- a/PoissonSolver/2D-seq/poisson.par
+++ b/PoissonSolver/2D-seq/poisson.par
@@ -16,7 +16,7 @@ jmax       200		# number of interior cells in y-direction
 
 itermax  10000		# maximal number of pressure iteration in one time step
 eps      0.000001	# stopping tolerance for pressure iteration
-# omg      0.9999		# relaxation parameter for SOR iteration
-omg      1.93		# relaxation parameter for SOR iteration
+rho      0.99999		# relaxation parameter for SOR iteration
+omg      1.998		# relaxation parameter for SOR iteration
 
 #===============================================================================
diff --git a/PoissonSolver/2D-seq/src/main.c b/PoissonSolver/2D-seq/src/main.c
index 2a4497b..eb6a71b 100644
--- a/PoissonSolver/2D-seq/src/main.c
+++ b/PoissonSolver/2D-seq/src/main.c
@@ -10,31 +10,58 @@
 #include <stdlib.h>
 #include <unistd.h>
 
+#include "likwid-marker.h"
 #include "parameter.h"
 #include "solver.h"
 #include "timing.h"
 
+#define LIKWID_PROFILE(tag, call)                                                        \
+    startTime = getTimeStamp();                                                          \
+    LIKWID_MARKER_START(#tag);                                                           \
+    call(&solver);                                                                       \
+    LIKWID_MARKER_STOP(#tag);                                                            \
+    endTime = getTimeStamp();
+
+enum VARIANT { SOR = 1, RB, RBA };
+
 int main(int argc, char** argv)
 {
+    int variant = SOR;
     double startTime, endTime;
     Parameter params;
     Solver solver;
     initParameter(&params);
+    LIKWID_MARKER_INIT;
 
-    if (argc != 2) {
+    if (argc < 2) {
         printf("Usage: %s <configFile>\n", argv[0]);
         exit(EXIT_SUCCESS);
     }
 
     readParameter(&params, argv[1]);
     printParameter(&params);
+    if (argc == 3) {
+        variant = atoi(argv[2]);
+    }
 
     initSolver(&solver, &params, 2);
-    startTime = getTimeStamp();
-    solve(&solver);
-    endTime = getTimeStamp();
+    switch (variant) {
+    case SOR:
+        printf("Plain SOR\n");
+        LIKWID_PROFILE("SOR", solve);
+        break;
+    case RB:
+        printf("Red-black SOR\n");
+        LIKWID_PROFILE("RB", solveRB);
+        break;
+    case RBA:
+        printf("Red-black SOR with acceleration\n");
+        LIKWID_PROFILE("RBA", solveRBA);
+        break;
+    }
     printf("Solution took %.2fs\n", endTime - startTime);
     writeResult(&solver);
 
+    LIKWID_MARKER_CLOSE;
     return EXIT_SUCCESS;
 }
diff --git a/PoissonSolver/2D-seq/src/parameter.c b/PoissonSolver/2D-seq/src/parameter.c
index 6c08af9..f4a10fa 100644
--- a/PoissonSolver/2D-seq/src/parameter.c
+++ b/PoissonSolver/2D-seq/src/parameter.c
@@ -12,41 +12,48 @@
 #include "util.h"
 #define MAXLINE 4096
 
-void initParameter(Parameter *param) {
+void initParameter(Parameter* param)
+{
     param->xlength = 1.0;
     param->ylength = 1.0;
-    param->imax = 100;
-    param->jmax = 100;
+    param->imax    = 100;
+    param->jmax    = 100;
     param->itermax = 1000;
-    param->eps = 0.0001;
-    param->omg = 1.8;
+    param->eps     = 0.0001;
+    param->omg     = 1.8;
+    param->rho     = 0.99;
 }
 
-void readParameter(Parameter *param, const char *filename) {
-    FILE *fp = fopen(filename, "r");
+void readParameter(Parameter* param, const char* filename)
+{
+    FILE* fp = fopen(filename, "r");
     char line[MAXLINE];
     int i;
 
-    if(!fp) {
+    if (!fp) {
         fprintf(stderr, "Could not open parameter file: %s\n", filename);
         exit(EXIT_FAILURE);
     }
 
-    while(!feof(fp)) {
+    while (!feof(fp)) {
         line[0] = '\0';
         fgets(line, MAXLINE, fp);
-        for(i = 0; line[i] != '\0' && line[i] != '#'; i++);
+        for (i = 0; line[i] != '\0' && line[i] != '#'; i++)
+            ;
         line[i] = '\0';
 
-        char *tok = strtok(line, " ");
-        char *val = strtok(NULL, " ");
+        char* tok = strtok(line, " ");
+        char* val = strtok(NULL, " ");
 
-        #define PARSE_PARAM(p,f)   if(strncmp(tok, #p, sizeof(#p) / sizeof(#p[0]) - 1) == 0) { param->p = f(val); }
-        #define PARSE_STRING(p)    PARSE_PARAM(p, strdup)
-        #define PARSE_INT(p)       PARSE_PARAM(p, atoi)
-        #define PARSE_REAL(p)      PARSE_PARAM(p, atof)
+#define PARSE_PARAM(p, f)                                                                \
+    if (strncmp(tok, #p, sizeof(#p) / sizeof(#p[0]) - 1) == 0) {                         \
+        param->p = f(val);                                                               \
+    }
+#define PARSE_STRING(p) PARSE_PARAM(p, strdup)
+#define PARSE_INT(p)    PARSE_PARAM(p, atoi)
+#define PARSE_REAL(p)   PARSE_PARAM(p, atof)
 
-        if(tok != NULL && val != NULL) {
+        if (tok != NULL && val != NULL) {
             PARSE_REAL(xlength);
             PARSE_REAL(ylength);
             PARSE_INT(imax);
@@ -54,13 +61,15 @@ void readParameter(Parameter *param, const char *filename) {
             PARSE_INT(itermax);
             PARSE_REAL(eps);
             PARSE_REAL(omg);
+            PARSE_REAL(rho);
         }
     }
 
     fclose(fp);
 }
 
-void printParameter(Parameter *param) {
+void printParameter(Parameter* param)
+{
     printf("Parameters:\n");
     printf("Geometry data:\n");
     printf("\tDomain box size (x, y): %e, %e\n", param->xlength, param->ylength);
diff --git a/PoissonSolver/2D-seq/src/parameter.h b/PoissonSolver/2D-seq/src/parameter.h
index d57ce19..ea3ec43 100644
--- a/PoissonSolver/2D-seq/src/parameter.h
+++ b/PoissonSolver/2D-seq/src/parameter.h
@@ -8,10 +8,10 @@
 #define __PARAMETER_H_
 
 typedef struct {
-    double  xlength, ylength;
+    double xlength, ylength;
     int imax, jmax;
     int itermax;
-    double eps, omg, gamma;
+    double eps, omg, rho, gamma;
 } Parameter;
 
 void initParameter(Parameter*);
diff --git a/PoissonSolver/2D-seq/src/solver.c b/PoissonSolver/2D-seq/src/solver.c
index c0395f8..14e89dd 100644
--- a/PoissonSolver/2D-seq/src/solver.c
+++ b/PoissonSolver/2D-seq/src/solver.c
@@ -24,6 +24,7 @@ void initSolver(Solver* solver, Parameter* params, int problem)
     solver->dy      = params->ylength / params->jmax;
     solver->eps     = params->eps;
     solver->omega   = params->omg;
+    solver->rho     = params->rho;
     solver->itermax = params->itermax;
 
     int imax        = solver->imax;
@@ -181,7 +182,7 @@ void solveRBA(Solver* solver)
     double idx2   = 1.0 / dx2;
     double idy2   = 1.0 / dy2;
     double factor = 0.5 * (dx2 * dy2) / (dx2 + dy2);
-    double rho    = solver->omega;
+    double rho    = solver->rho;
     double* p     = solver->p;
     double* rhs   = solver->rhs;
     double epssq  = eps * eps;
diff --git a/PoissonSolver/2D-seq/src/solver.h b/PoissonSolver/2D-seq/src/solver.h
index 70887a1..8277d16 100644
--- a/PoissonSolver/2D-seq/src/solver.h
+++ b/PoissonSolver/2D-seq/src/solver.h
@@ -12,7 +12,7 @@ typedef struct {
     double dx, dy;
     int imax, jmax;
     double *p, *rhs;
-    double eps, omega;
+    double eps, omega, rho;
     int itermax;
 } Solver;