All, I am trying to use KSPSolve for a QCG solver using petsc 3.4.3 and it gives me the error of "PC does not have left symmetric apply!". Further reading on the web pages suggest I need to use KSPSetPCSide to set up a symmetric side for the solver. However, this does not seem to work. I am doing the following in an F90 code:
call KSPSetPCType(ksp_ptr%ksp, 'qcg', petsc_err) call KSPSetPCSide(ksp_ptr%ksp, PC_SYMMETRIC, petsc_err) but I still get the same failure message when I call KSPSolve(ksp_ptr%ksp..) later on. Any ideas as to why this is not working? Carol Dr Carol Brickley BSc,PhD,ARCS,DIC,MBCS Senior Software Engineer Applied Computer Science DS+T, AWE Aldermaston Reading Berkshire RG7 4PR Direct: 0118 9855035 ___________________________________________________ ____________________________ The information in this email and in any attachment(s) is commercial in confidence. If you are not the named addressee(s) or if you receive this email in error then any distribution, copying or use of this communication or the information in it is strictly prohibited. Please notify us immediately by email at admin.internet(at)awe.co.uk, and then delete this message from your computer. While attachments are virus checked, AWE plc does not accept any liability in respect of any virus which is not detected. AWE Plc Registered in England and Wales Registration No 02763902 AWE, Aldermaston, Reading, RG7 4PR
