Hello I am undergraduate student and I am working in scientific research. It includes solving three-diagonal matrices and we chose cuSparse and Tesla C2075 for better performance. But we found that it doesn’t work linearly. For example if choose matrice size = 17 cusparse solves it in 0.4 sec but for size = 18 time is 1.6 sec. Finally we tested cusparse performance for N from 5 to 1000. Y-axis for clocks, X-axis for size of matrice. You can see that time for N = 900 approximately equal to time for N = 230, but it is 3-5 times less than time for N = 500.
UPD: I forgot to say that we measured time for 100 times of execution. So real time is 0.004 and 0.016 seconds.