Table 1: Information of GMRES(16) method without preconditioning and matrix properties.

Matrix 𝑛 𝑛 𝑛 𝑧 𝑃 𝐷 𝐼 time 𝑖 𝑡

hor-131 434 4182 No 67.594 4273
sherman2 1080 23094 No + +
cavity05 1182 32632 No 0.875 27
cavity06118229675 No + +
sherman4 1104 3786 No 0.531 23
epb0 1794 7764 No + +
pde2961 2961 14585 yes 0.734 18