Dear PETSc team, I have seen that there is the KSP method: KSPAGMRES, https://petsc.org/release/docs/manualpages/KSP/KSPAGMRES.html <https://petsc.org/release/docs/manualpages/KSP/KSPAGMRES.html>
I wanted to test this method, as it also seems to reduce the amount of MPI communication, compared to the standard GMRES. I supposed that the class is called “KSPAGMRES”. But in the include files petscksp.h and petsc/finclude/petscksp.h there is no definition for KSPAGMRES, just KSPDGMRES. I wonder if the definition KSPAGMRES is simply missing, or do I have to call DGMRES and set another option for AGMRES ?! The standard GMRES has the problem that MPI_Allreduce gets expensive for 2048 cores. Therefore I wanted to see, if AGMRES has a bit less communication, as this is mentioned in the description of the method. Greetings, Frank Bramkamp
