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Which norm of the residual is used in CULA Sparse?

PostPosted: Sat Mar 22, 2014 4:56 am
by nene19861005
I use cula to simulate the incompressible flow with free surface. I need to solve the poisson equation every timestep. I do wonder which norm of the residual is used in cula sparse. According to my experience, a inproper relative tolerance may give a wrong result. For instance, a tolerance 1e-10 gives a wrong result while a tolerance 1e-15 gives a right result. The max tolerance on my card GTX 670 is 1e-15. Is there a strategy to specify the max value of the difference between two iterative step? Looking forward to any useful tips! Tahnks!