Are you running a PETSc example? Please send exactly what options you are using to run the code.
On a test case it is working correctly for me, we need your help to reproduce the problem. Barry On Jan 18, 2011, at 2:06 AM, Kathrin Burckhardt wrote: > Dear all, > > I have a problem using BiCGStab with right preconditioning. > > Solving my system using gmres everything looks ok: > > 0 KSP preconditioned resid norm 4.490868831255e-04 true resid norm > 4.490868831255e-04 ||Ae||/||Ax|| 6.402973612108e-01 > 1 KSP preconditioned resid norm 2.641616638766e-04 true resid norm > 2.641616638766e-04 ||Ae||/||Ax|| 3.766353965541e-01 > > > Solving it with bcgs, however, I got: > > 0 KSP preconditioned resid norm 4.490868831255e-04 true resid norm > 1.222737120188e+01 ||Ae||/||Ax|| 1.743349407273e+04 > 1 KSP preconditioned resid norm 1.801799542022e-04 true resid norm > 1.222736696074e+01 ||Ae||/||Ax|| 1.743348802582e+04 > > What could be wrong? > > Looking forward to your help, > Kathrin
