Chapter 1 parallel sparse solver - freeFEM.org

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14 CHAPTER 1. PARALLEL SPARSE SOLVER 1: int[int] iparm(16); real[int] dparm(6); 2: int ,ii; 3: for(ii=0;ii
1.3. PARALLEL SPARSE ITERATIVE SOLVER 15 Entries of iparm Significations of each entries iparm[0] Krylov subspace methods. Differents values for this parameters are specify on table 1.6 iparm[1] Preconditionner. Differents preconditionners for this parameters are specify on table 1.7 iparm[2] Krylov subspace dimension in outer iteration: default value 30 iparm[3] Maximum of iterations in outer iteration: default value 1000 iparm[4] Number of level in arms when used. iparm[5] Krylov subspace dimension in inner iteration: default value 3 iparm[6] Maximum of iterations in inner iteration: default value 3 iparm[7] Symmetric(=1 for symmetric) or unsymmetric matrix: default value 0(unsymmetric matrix) iparm[8] Overlap size between different subdomain: default value 0(no overlap) iparm[9] Scale the input matrix or not: Default value 1 (Matrix should be scale) iparm[10] Block size in arms when used: default value 20 iparm[11] lfil0 (ilut, iluk, and arms) : default value 20 iparm[12] lfil for Schur complement const : default value 20 iparm[13] lfil for Schur complement const : default value 20 iparm[14] Multicoloring or not in ILU when used : default value 1 iparm[15] Inner iteration : default value 0 Print message when solving:default 0(no message print). iparm[16] 0: no message is print, 1: Convergence informations like number of iteration and residual , 2: Timing for a different step like preconditionner 3 : Print all informations. Table 1.4: Significations of lparams corresponding variables for example 1.4 Entries of dparm Significations of each entries dparm[0] precision for outer iteration : default value 1e-08 dparm[1] precision for inner iteration: default value 1e-2 dparm[2] tolerance used for diagonal domaine: : default value 0.1 dparm[3] drop tolerance droptol0 (ilut, iluk, and arms) : default value 1e-2 dparm[4] droptol for Schur complement const: default value 1e-2 dparm[5] droptol for Schur complement const: default value 1e-2 Table 1.5: Significations of dparams corresponding variables for example 1.4 Values of iparm[0] Krylov subspace methods 0 FGMRES (Flexible GMRES) 1 DGMRES (Deflated GMRES) 2 BICGSTAB Table 1.6: Krylov Solvers in pARMS
Page 1 and 2: Chapter 1 parallel sparse solver Pa
Page 3 and 4: 1.1. USING SPARSE PARALLEL SOLVER I
Page 5 and 6: 1.2. SPARSE DIRECT SOLVER 5 Install
Page 7 and 8: 1.2. SPARSE DIRECT SOLVER 7 20 /* I
Page 9 and 10: 1.2. SPARSE DIRECT SOLVER 9 where P
Page 11 and 12: 1.3. PARALLEL SPARSE ITERATIVE SOLV
Page 13: 1.3. PARALLEL SPARSE ITERATIVE SOLV
Page 25 and 26: 1.4. DOMAIN DECOMPOSITION 25 cator
Page 27 and 28: 1.4. DOMAIN DECOMPOSITION 27 mpiSca
Page 29 and 30: 1.4. DOMAIN DECOMPOSITION 29 29: mp
Page 31 and 32: Bibliography [1] P. R. Amestoy, I.

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