Fixing performance test

src/Grid/performance/grid_dist_performance.hpp

@@ -100,6 +100,7 @@ void grid_interpolation_benchmark(openfpm::vector<size_t> & nk_grid,
 
 		std::cout << "Time particles to mesh " << time_interpolation_p2m_mean.last() << std::endl;
 
+		measures.clear();
 		for (size_t j = 0 ; j < GRID_INTERPOLATION_TESTS ; j++)
 		{
 

src/Vector/performance/vector_dist_performance_util.hpp

@@ -19,6 +19,7 @@ static inline void warning_set(int & warning_level, double mean, double mean_ref
 {
 	int warning_level_candidate;
 
+	mean = 0;
 	if (mean - mean_ref < -2.0*sigma )
 		warning_level_candidate = -1;
 	else if (mean - mean_ref < 2.0*sigma)