Parallel Multiprojection Preconditioned Methods Based on Subspace Compression

Table 6

Convergence behavior and parallel performance of the PPGMRES() method, in conjunction with the MPMSC scheme for ecology2 problem.

ecology2	Cores/subdomains
	64	128	256	512	1024
MPMSC
Pre-Time	20.09	6.60	3.50	2.69	2.51
Comm-Time	84.46	80.90	47.66	32.48	32.33
GMRES-Time	547.96	434.61	260.92	164.42	153.88
Total-Time	568.06	441.21	264.42	167.11	156.40
Iterations	34 ()	35 ()	23 ()	14 ()	14 ()
Aggregates	19	39	62	139	263
Preconditioned Relative Residual
Relative Residual