Is it possible to use mixed-precision strategy on AMGX?

[xiaochiyue]

Supposing I used PCG(in double precision) as solver, and AMG(in single precision) as preconditioner, I would expect to have good performance for large scale matrix?

[marsaev]

Mixed-precision strategy currently is that ALL of the matrices inside AMGX are stored in one type and ALL of the vectors - in another - usually it's float for matrices and double for vectors. This will affect all parts of AMGX, so it's not possible to have two solvers that work on different types of data.