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Parallelization

MPI-GMRES 2D

To launch this script, use for example:

1ff-mpirun -np 12 MPIGMRES2D.edp -d 1 -k 1 -gmres 2 -n 50
  1//usage :
  2//ff-mpirun [mpi parameter] MPIGMRES2d.edp [-glut ffglut] [-n N] [-k K] [-d D] [-ns] [-gmres [0|1]
  3//arguments:
  4//-glut ffglut : to see graphicaly the process
  5//-n N: set the mesh cube split NxNxN
  6//-d D: set debug flag D must be one for mpiplot
  7//-k K: to refined by K all element
  8//-ns: remove script dump
  9//-gmres
 10//0: use iterative schwarz algo.
 11//1: Algo GMRES on residu of schwarz algo
 12//2: DDM GMRES
 13//3: DDM GMRES with coarse grid preconditionner (Good one)
 14
 15load "MPICG"
 16load "medit"
 17load "metis"
 18include "getARGV.idp"
 19include "MPIplot.idp"
 20include "MPIGMRESmacro.idp"
 21
 22searchMethod = 0; //more safe seach algo (warning can be very expensive in case of lot of ouside point)
 23assert(version >= 3.11); //need at least v3.11
 24real[int] ttt(10);
 25int ittt=0;
 26macro settt {ttt[ittt++] = mpiWtime();}//
 27
 28// Arguments
 29verbosity = getARGV("-vv", 0);
 30int vdebug = getARGV("-d", 1);
 31int ksplit = getARGV("-k", 3);
 32int nloc = getARGV("-n", 10);
 33string sff = getARGV("-p", "");
 34int gmres = getARGV("-gmres", 2);
 35bool dplot = getARGV("-dp", 0);
 36int nC = getARGV("-N", max(nloc/10, 4));
 37
 38if (mpirank==0 && verbosity){
 39    cout << "ARGV: ";
 40    for (int i = 0; i < ARGV.n; ++i)
 41        cout << ARGV[i] << " ";
 42    cout << endl;
 43}
 44
 45if(mpirank==0 && verbosity)
 46cout << " vdebug: " << vdebug << ", kspilt "<< ksplit << ", nloc "<< nloc << ", sff "<< sff << "." << endl;
 47
 48// Parameters
 49int withplot = 0;
 50bool withmetis = 1;
 51bool RAS = 1;
 52string sPk = "P2-2gd";
 53func Pk = P2;
 54int sizeoverlaps = 1; //size of overlap
 55int[int] l111 = [1, 1, 1, 1]; //mesh labels
 56
 57// MPI function
 58func bool plotMPIall(mesh &Th, real[int] &u, string cm){
 59    if(vdebug)
 60        PLOTMPIALL(mesh, Pk, Th, u, {cmm=cm, nbiso=20, fill=1, dim=3, value=1});
 61    return 1;
 62}
 63
 64// MPI
 65mpiComm comm(mpiCommWorld,0,0); //trick : make a no split mpiWorld
 66
 67int npart = mpiSize(comm); //total number of partion
 68int ipart = mpiRank(comm); //current partition number
 69
 70int njpart = 0; //Number of part with intersection (a jpart) with ipart without ipart
 71int[int] jpart(npart); //list of jpart
 72if(ipart==0)
 73    cout << " Final N = " << ksplit*nloc << ", nloc = " << nloc << ", split = " << ksplit << endl;
 74settt
 75
 76// Mesh
 77mesh Thg = square(nloc, nloc, label=l111);
 78mesh ThC = square(nC, nC, label=l111);// Coarse mesh
 79
 80mesh Thi, Thin; //with overlap, without olverlap
 81
 82// Fespace
 83fespace Phg(Thg, P0);
 84Phg part;
 85
 86fespace Vhg(Thg, P1);
 87Vhg unssd; //boolean function: 1 in the subdomain, 0 elswhere
 88
 89fespace VhC(ThC, P1); // of the coarse problem
 90
 91// Partitioning
 92{
 93    int[int] nupart(Thg.nt);
 94    nupart = 0;
 95    if (npart > 1 && ipart == 0)
 96        metisdual(nupart, Thg, npart);
 97
 98    broadcast(processor(0, comm), nupart);
 99    for(int i = 0; i < nupart.n; ++i)
100        part[][i] = nupart[i];
101}
102
103if (withplot > 1)
104    plot(part, fill=1, cmm="dual", wait=1);
105
106// Overlapping partition
107Phg suppi = abs(part-ipart) < 0.1;
108
109Thin = trunc(Thg, suppi>0, label=10); // non-overlapping mesh, interfaces have label 10
110int nnn = sizeoverlaps*2;// to be sure
111AddLayers(Thg, suppi[], nnn, unssd[]); //see above! suppi and unssd are modified
112unssd[] *= nnn; //to put value nnn a 0
113real nnn0 = nnn - sizeoverlaps + 0.001;
114Thi = trunc(Thg, unssd>nnn0, label=10); //overlapping mesh, interfaces have label 10
115
116settt
117
118// Fespace
119fespace Vhi(Thi,P1);
120int npij = npart;
121Vhi[int] pij(npij); //local partition of unit + pii
122Vhi pii;
123
124real nnn1 = +0.001;
125{
126    /*
127    construction of the partition of the unit,
128    let phi_i P1 FE function 1 on Thin and zero ouside of Thi and positive
129    the partition is build with
130    p_i = phi_i/ \sum phi_i
131
132    to build the partition of one domain i
133    we nned to find all j such that supp(phi_j) \cap supp(phi_j) is not empty
134    <=> int phi_j
135    */
136    //build a local mesh of thii such that all computation of the unit partition are
137    //exact in thii
138    mesh Thii = trunc(Thg, unssd>nnn1, label=10); //overlapping mesh, interfaces have label 10
139
140    {
141        //find all j mes (supp(p_j) cap supp(p_i)) >0
142        //compute all phi_j on Thii
143        //remark: supp p_i include in Thi
144
145        // Fespace
146        fespace Phii(Thii, P0);
147        fespace Vhii(Thii, P1);
148        Vhi sumphi = 0;
149        Vhii phii = 0;
150
151        jpart = 0;
152        njpart = 0;
153        int nlayer = RAS ? 1 : sizeoverlaps;
154        if (ipart == 0)
155            cout << "nlayer = " << nlayer << endl;
156        pii = max(unssd-nnn+nlayer, 0.)/nlayer;
157        if(dplot)
158            plot(pii, wait=1, cmm=" 0000");
159        sumphi[] += pii[];
160        if(dplot)
161            plot(sumphi, wait=1, cmm=" summ 0000");
162
163        real epsmes = 1e-10*Thii.area;
164        for (int i = 0; i < npart; ++i)
165            if (i != ipart){
166            Phii suppii = abs(i-part) < 0.2;
167            if (suppii[].max > 0.5){
168                AddLayers(Thii, suppii[], nlayer, phii[]);
169                assert(phii[].min >= 0);
170                real interij = int2d(Thi)(phii);
171                if (interij > epsmes){
172                    pij[njpart] = abs(phii);
173                    if(vdebug > 2)
174                        cout << " ***** " << int2d(Thi)(real(pij[njpart])<0) << " " <<pij[njpart][].min << " " << phii[].min << endl;
175                    assert(int2d(Thi)(real(pij[njpart]) < 0) == 0);
176                    if(dplot)
177                        plot(pij[njpart], wait=1, cmm=" j = "+ i + " " + njpart);
178                    sumphi[] += pij[njpart][];
179                    if(dplot)
180                        plot(sumphi, wait=1, cmm=" sum j = "+ i + " " + njpart);
181                    jpart[njpart++] = i;
182                }
183            }
184        }
185
186        if(dplot)
187            plot(sumphi, wait=1, dim=3, cmm="sum ", fill=1);
188        pii[] = pii[] ./ sumphi[];
189        for (int j = 0; j < njpart; ++j)
190            pij[j][] = pij[j][] ./ sumphi[];
191        jpart.resize(njpart);
192        for (int j = 0; j < njpart; ++j)
193            assert(pij[j][].max <= 1);
194        {
195            cout << ipart << " number of jpart " << njpart << " : ";
196            for (int j = 0; j < njpart; ++j)
197                cout << jpart[j] << " ";
198            cout << endl;
199        }
200        sumphi[] = pii[];
201        for (int j = 0; j < njpart; ++j)
202            sumphi[] += pij[j][];
203        if(vdebug > 2)
204            cout << "sum min " << sumphi[].min << " " << sumphi[].max << endl;
205        assert(sumphi[].min > 1.-1e-6 && sumphi[].max < 1.+1e-6);
206    }
207} //Thii is remove here
208// end of the construction of the local partition of the unity ...
209// on Thi
210if (ipart == 0)
211    cout << "End build partition" << endl;
212
213// Computation of number of intersection
214//here pii and the pij is the local partition of the unit on
215//Thi (mesh with overlap)
216if ( dplot){
217    plot(Thi, wait=1);
218    for(int j = 0; j < njpart; ++j)
219        plot(pij[j], cmm=" j="+j, wait=1);
220}
221
222//Partition of the unity on Thi
223//computation of message
224//all j > we have to receive
225//data on intersection of the support of pij[0] and pij[j]
226settt
227
228if(vdebug)
229    plotMPIall(Thi, pii[], "pi_i");
230
231mesh[int] aThij(njpart);
232matrix Pii;
233matrix[int] sMj(njpart); //M of send to j
234matrix[int] rMj(njpart); //M to recv from j
235fespace Whi(Thi, Pk);
236mesh Thij = Thi;
237fespace Whij(Thij, Pk);//
238
239//construction of the mesh intersect i,j part
240for(int jp = 0; jp < njpart; ++jp)
241    aThij[jp] = trunc(Thi, pij[jp] > 1e-6, label=10); //mesh of the supp of pij
242
243for(int jp = 0; jp < njpart; ++jp)
244    aThij[jp] = trunc(aThij[jp], 1, split=ksplit);
245
246Thi = trunc(Thi, 1, split=ksplit);
247
248settt
249
250if (ipart == 0)
251    cout << "End build mesh intersection" << endl;
252
253// Construction of transfert matrix
254{
255    Whi wpii = pii;
256    Pii = wpii[];
257    for(int jp = 0; jp < njpart; ++jp){
258        int j = jpart[jp];
259        Thij = aThij[jp];
260        matrix I = interpolate(Whij, Whi); //Whji <- Whi
261        sMj[jp] = I*Pii; //Whi -> s Whij
262        rMj[jp] = interpolate(Whij, Whi, t=1); //Whji -> Whi
263        if(vdebug > 10){
264            {Whi uuu=1; Whij vvv=-1; vvv[]+=I*uuu[]; cout << jp << " %%% " << vvv[].linfty << endl; assert(vvv[].linfty < 1e-6);}
265            {Whi uuu=1; Whij vvv=-1; vvv[]+=rMj[jp]'*uuu[]; cout << jp << " ### " << vvv[].linfty << endl; assert(vvv[].linfty < 1e-6);}
266        }
267    }
268}
269if (ipart == 0)
270    cout << "End build transfert matrix" << endl;
271
272// Allocate array of send and recv data
273InitU(njpart, Whij, Thij, aThij, Usend) //initU(n, Vh, Th, aTh, U)
274InitU(njpart, Whij, Thij, aThij, Vrecv)
275if (ipart == 0)
276    cout << "End init data for send/revc" << endl;
277
278Whi ui, vi;
279
280func bool Update(real[int] &ui, real[int] &vi){
281    for(int j = 0; j < njpart; ++j)
282        Usend[j][] = sMj[j]*ui;
283    SendRecvUV(comm, jpart, Usend, Vrecv)
284    vi = Pii*ui;
285    for(int j = 0; j < njpart; ++j)
286        vi += rMj[j]*Vrecv[j][];
287    return true;
288}
289
290// Definition of the Problem
291func G = x*0.1;
292func F = 1.;
293macro grad(u) [dx(u),dy(u)] //
294varf vBC (U, V) = on(1, U=G);
295varf vPb (U, V) = int2d(Thi)(grad(U)'*grad(V)) + int2d(Thi)(F*V) + on(10, U=0) + on(1, U=G);
296varf vPbC (U, V) = int2d(ThC)(grad(U)'*grad(V)) + on(1, U=0);
297varf vPbon (U, V) = on(10, U=1) + on(1, U=1);
298varf vPbon10only (U, V) = on(10, U=1) + on(1, U=0);
299//remark the order is important we want 0 part on 10 and 1
300
301matrix Ai = vPb(Whi, Whi, solver=sparsesolver);
302matrix AC, Rci, Pci;
303
304if (mpiRank(comm) == 0)
305    AC = vPbC(VhC, VhC, solver=sparsesolver);
306
307Pci = interpolate(Whi, VhC);
308Rci = Pci'*Pii;
309
310real[int] onG10 = vPbon10only(0, Whi);
311real[int] onG = vPbon(0, Whi);
312real[int] Bi=vPb(0, Whi);
313
314int kiter = -1;
315
316func bool CoarseSolve(real[int] &V, real[int] &U, mpiComm &comm){
317    //solving the coarse probleme
318    real[int] Uc(Rci.n), Bc(Uc.n);
319    Uc = Rci*U;
320    mpiReduce(Uc, Bc, processor(0, comm), mpiSUM);
321    if (mpiRank(comm) == 0)
322        Uc = AC^-1*Bc;
323    broadcast(processor(0, comm), Uc);
324    V = Pci*Uc;
325}
326
327func real[int] DJ (real[int] &U){
328    ++kiter;
329    real[int] V(U.n);
330    V = Ai*U;
331    V = onG10 ? 0.: V; //remove internal boundary
332    return V;
333}
334
335func real[int] PDJ (real[int] &U){
336    real[int] V(U.n);
337
338    real[int] b = onG10 ? 0. : U;
339    V = Ai^-1*b;
340    Update(V, U);
341    return U;
342}
343
344func real[int] PDJC (real[int] &U){
345    real[int] V(U.n);
346    CoarseSolve(V, U, comm);
347    V = -V; //-C2*Uo
348    U += Ai*V; //U = (I-A C2) Uo
349    real[int] b = onG10 ? 0. : U;
350    U = Ai^-1*b; // (C1( I -A C2) Uo
351    V = U -V;
352    Update(V, U);
353    return U;
354}
355
356func real[int] DJ0(real[int] &U){
357    ++kiter;
358    real[int] V(U.n);
359    real[int] b = onG .* U;
360    b = onG ? b : Bi ;
361    V = Ai^-1*b;
362    Update(V, U);
363    V -= U;
364    return V;
365}
366
367Whi u = 0, v;
368{ //verification
369    Whi u = 1, v;
370    Update(u[], v[]);
371    u[] -= v[];
372    assert(u[].linfty < 1e-6);
373}
374
375settt
376u[] = vBC(0, Whi, tgv=1); //set u with tgv BC value
377
378real epss = 1e-6;
379int rgmres = 0;
380if (gmres == 1){
381    rgmres = MPIAffineGMRES(DJ0, u[], veps=epss, nbiter=300, comm=comm, dimKrylov=100, verbosity=ipart ? 0: 50);
382    real[int] b = onG .* u[];
383    b = onG ? b : Bi;
384    v[] = Ai^-1*b;
385    Update(v[], u[]);
386}
387else if (gmres == 2)
388    rgmres = MPILinearGMRES(DJ, precon=PDJ, u[], Bi, veps=epss, nbiter=300, comm=comm, dimKrylov=100, verbosity=ipart ? 0: 50);
389else if (gmres == 3)
390    rgmres = MPILinearGMRES(DJ, precon=PDJC, u[], Bi, veps=epss, nbiter=300, comm=comm, dimKrylov=100, verbosity=ipart ? 0: 50);
391else //algo Shwarz for demo
392    for(int iter = 0; iter < 10; ++iter){
393        real[int] b = onG .* u[];
394        b = onG ? b : Bi ;
395        v[] = Ai^-1*b;
396
397        Update(v[], u[]);
398        if(vdebug)
399            plotMPIall(Thi, u[], "u-"+iter);
400        v[] -= u[];
401
402        real err = v[].linfty;
403        real umax = u[].max;
404        real[int] aa = [err, umax], bb(2);
405        mpiAllReduce(aa, bb, comm, mpiMAX);
406        real errg = bb[0];
407        real umaxg = bb[1];
408
409        if (ipart == 0)
410            cout << ipart << " err = " << errg << " u. max " << umaxg << endl;
411        if (errg < 1e-5) break;
412    }
413
414if (vdebug)
415    plotMPIall(Thi, u[], "u-final");
416
417settt
418
419real errg = 1, umaxg;
420{
421    real umax = u[].max, umaxg;
422    real[int] aa = [umax], bb(1);
423    mpiAllReduce(aa, bb, comm, mpiMAX);
424    errg = bb[0];
425    if (ipart == 0)
426        cout << "umax global = " << bb[0] << " Wtime = " << (ttt[ittt-1]-ttt[ittt-2]) << " s " << " " << kiter << endl;
427}
428
429if (sff != ""){
430    ofstream ff(sff+".txt", append);
431    cout << " ++++ ";
432    cout << mpirank << "/" << mpisize << " k=" << ksplit << " n= " << nloc << " " << sizeoverlaps << " it= " << kiter;
433    for (int i = 1; i < ittt; ++i)
434        cout << " " << ttt[i]-ttt[i-1] << " ";
435    cout << epss << " " << Ai.nbcoef << " " << Ai.n << endl;
436
437    /*
438    1 mpirank
439    2 mpisize
440    3 ksplit
441    4 nloc
442    5 sizeoverlaps
443    6 kiter
444    7 mesh & part build
445    8 build the partion
446    9 build mesh, transfere , and the fine mesh ..
447    10 build the matrix, the trans matrix, factorizatioon
448    11 GMRES
449    */
450
451    ff << mpirank << " " << mpisize << " " << sPk << " ";
452    ff << ksplit << " " << nloc << " " << sizeoverlaps << " " << kiter;
453    for (int i = 1; i < ittt; ++i)
454        ff << " " << ttt[i]-ttt[i-1] << " ";
455    ff << epss << " " << Ai.nbcoef << " " << Ai.n << " " << gmres << endl;
456}
../_images/MPIGMRES2D.png

Fig. 220 Results

MPI-GMRES 3D

Todo

todo

Direct solvers

 1load "MUMPS_FreeFem"
 2//default solver: real-> MUMPS, complex -> MUMPS
 3load "real_SuperLU_DIST_FreeFem"
 4default solver: real-> SuperLU_DIST, complex -> MUMPS
 5load "real_pastix_FreeFem"
 6//default solver: real-> pastix, complex -> MUMPS
 7
 8// Solving with pastix
 9{
10    matrix A =
11        [[1, 2, 2, 1, 1],
12        [ 2, 12, 0, 10 , 10],
13        [ 2, 0, 1, 0, 2],
14        [ 1, 10, 0, 22, 0.],
15        [ 1, 10, 2, 0., 22]];
16
17    real[int] xx = [1, 32, 45, 7, 2], x(5), b(5), di(5);
18    b = A*xx;
19    cout << "b = " << b << endl;
20    cout << "xx = " << xx << endl;
21
22    set(A, solver=sparsesolver, datafilename="ffpastix_iparm_dparm.txt");
23    cout << "solve" << endl;
24    x = A^-1*b;
25    cout << "b = " << b << endl;
26    cout << "x = " << endl;
27    cout << x << endl;
28    di = xx - x;
29    if (mpirank == 0){
30        cout << "x-xx = " << endl;
31        cout << "Linf = " << di.linfty << ", L2 = " << di.l2 << endl;
32    }
33}
34
35// Solving with SuperLU_DIST
36realdefaulttoSuperLUdist();
37//default solver: real-> SuperLU_DIST, complex -> MUMPS
38{
39    matrix A =
40        [[1, 2, 2, 1, 1],
41        [ 2, 12, 0, 10 , 10],
42        [ 2, 0, 1, 0, 2],
43        [ 1, 10, 0, 22, 0.],
44        [ 1, 10, 2, 0., 22]];
45
46    real[int] xx = [1, 32, 45, 7, 2], x(5), b(5), di(5);
47    b = A*xx;
48    cout << "b = " << b << endl;
49    cout << "xx = " << xx << endl;
50
51    set(A, solver=sparsesolver, datafilename="ffsuperlu_dist_fileparam.txt");
52    cout << "solve" << endl;
53    x = A^-1*b;
54    cout << "b = " << b << endl;
55    cout << "x = " << endl;
56    cout << x << endl;
57    di = xx - x;
58    if (mpirank == 0){
59        cout << "x-xx = " << endl;
60        cout << "Linf = " << di.linfty << ", L2 = " << di.l2 << endl;
61    }
62}
63
64// Solving with MUMPS
65defaulttoMUMPS();
66//default solver: real-> MUMPS, complex -> MUMPS
67{
68    matrix A =
69        [[1, 2, 2, 1, 1],
70        [ 2, 12, 0, 10 , 10],
71        [ 2, 0, 1, 0, 2],
72        [ 1, 10, 0, 22, 0.],
73        [ 1, 10, 2, 0., 22]];
74
75    real[int] xx = [1, 32, 45, 7, 2], x(5), b(5), di(5);
76    b = A*xx;
77    cout << "b = " << b << endl;
78    cout << "xx = " << xx << endl;
79
80    set(A, solver=sparsesolver, datafilename="ffmumps_fileparam.txt");
81    cout << "solving solution" << endl;
82    x = A^-1*b;
83    cout << "b = " << b << endl;
84    cout << "x = " << endl;
85    cout << x << endl;
86    di = xx - x;
87    if (mpirank == 0){
88        cout << "x-xx = " << endl;
89        cout << "Linf = " << di.linfty << ", L2 " << di.l2 << endl;
90    }
91}

Solver MUMPS

  1load "MUMPS_FreeFem"
  2
  3// Parameters
  4int[int] ICNTL(40); //declaration of ICNTL parameter for MUMPS
  5
  6//get value of ICNTL from file
  7if (mpirank == 0){
  8    ifstream ff("ffmumps_fileparam.txt");
  9    string line;
 10    getline(ff, line);
 11    getline(ff, line);
 12    for (int iii = 0; iii < 40; iii++){
 13        ff >> ICNTL[iii];
 14        getline(ff, line);
 15    }
 16}
 17
 18broadcast(processor(0), ICNTL);
 19
 20// Given data of MUMPS solver in array lparams(SYM, PAR, ICNTL)
 21// There is no symmetric storage for a matrix associated with a sparse solver.
 22// Therefore, the matrix will be considered unsymmetric for parallel sparse solver even if symmetric.
 23{
 24    // Problem
 25    int SYM = 0;
 26    int PAR = 1;
 27    matrix A =
 28        [
 29            [40, 0, 45, 0, 0],
 30            [0, 12, 0, 0, 0],
 31            [0, 0, 40, 0, 0],
 32            [12, 0, 0, 22, 0],
 33            [0, 0, 20, 0, 22]
 34        ];
 35
 36    // Construction of integer parameter for MUMPS
 37    int[int] MumpsLParams(42);
 38    MumpsLParams[0] = SYM;
 39    MumpsLParams[1] = PAR;
 40    for (int ii = 0; ii < 40; ii++)
 41        MumpsLParams[ii+2] = ICNTL[ii]; //ICNTL begin with index 0 here
 42
 43    real[int] xx = [1, 32, 45, 7, 2], x(5), b(5), di(5);
 44    b = A*xx;
 45    if (mpirank == 0)
 46        cout << "xx = " << xx << endl;
 47
 48    set(A, solver=sparsesolver, lparams=MumpsLParams); //we take the default value for CNTL MUMPS parameter
 49
 50    // Solve
 51    if (mpirank == 0)
 52        cout << "Solve" << endl;
 53    x = A^-1*b;
 54    if (mpirank == 0)
 55        cout << "b = " << b << endl;
 56    if (mpirank == 0)
 57        cout << "x = " << endl; cout << x << endl;
 58    di = xx-x;
 59    if (mpirank == 0){
 60        cout << "x-xx = " << endl;
 61        cout << "Linf = " << di.linfty << ", L2 = " << di.l2 << endl;
 62    }
 63}
 64
 65// Read parameter of MUMPS solver in file ffmumps_fileparam.txt
 66{
 67    // Problem
 68    matrix A =
 69        [
 70            [40, 0, 45, 0, 0],
 71            [0, 12, 0, 0 , 0],
 72            [0, 0, 40, 0, 0],
 73            [12, 0, 0, 22, 0],
 74            [0, 0, 20, 0, 22]
 75        ];
 76
 77    real[int] xx = [1, 32, 45, 7000, 2], x(5), b(5), di(5);
 78    b = A*xx;
 79    if (mpirank == 0){
 80        cout << "b = " << b << endl;
 81        cout << "xx = " << xx << endl;
 82    }
 83
 84    set(A, solver=sparsesolver, datafilename="ffmumps_fileparam.txt");
 85
 86    // Solve
 87    if (mpirank == 0)
 88        cout << "Solve" << endl;
 89    x = A^-1*b;
 90
 91    if (mpirank == 0){
 92        cout << "b = " << b << endl;
 93        cout << "x = " << x << endl;
 94    }
 95    di = xx-x;
 96    if (mpirank == 0){
 97        cout << "x-xx = " << endl;
 98        cout << "Linf = " << di.linfty << ", L2 = " << di.l2 << endl;
 99    }
100}

Solver superLU_DIST

Todo

write code (SuperLU_DIST seems to have a bug)

Solver PaStiX

Todo

write code (PaStiX seems to have a bug)

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