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Mathematical Problems in Engineering
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Special Issues
Mathematical Problems in Engineering
/
2017
/
Article
/
Tab 2
/
Research Article
Parallel Multiprojection Preconditioned Methods Based on Subspace Compression
Table 2
Convergence behavior and parallel performance of the PPGMRES(
) method, in conjunction with the Block Jacobi preconditioner, for the 3D Poisson problem (
).
Poisson 3D
Cores/subdomains
64
128
256
512
1024
Block Jacobi
Pre-Time
368.53
69.43
21.42
6.26
3.58
Comm-Time
24.14
16.63
12.21
11.72
12.62
GMRES-Time
133.28
90.17
66.13
64.25
61.81
Total-Time
501.81
159.60
87.55
70.51
65.39
Iterations
4 (
)
5 (
)
5 (
)
5 (
)
5 (
)
Preconditioned Relative Residual
Relative Residual