Actual source code: snesut.c
1: #include <petsc/private/snesimpl.h>
2: #include <petscdm.h>
3: #include <petscdmshell.h>
4: #include <petscsection.h>
5: #include <petscblaslapack.h>
7: /*@C
8: SNESMonitorSolution - Monitors progress of a `SNES` `SNESSolve()` by calling
9: `VecView()` for the approximate solution at each iteration.
11: Collective
13: Input Parameters:
14: + snes - the `SNES` context
15: . its - iteration number
16: . fgnorm - 2-norm of residual
17: - vf - a viewer
19: Options Database Key:
20: . -snes_monitor_solution [ascii binary draw][:filename][:viewer format] - plots solution at each iteration
22: Level: intermediate
24: Note:
25: This is not called directly by users, rather one calls `SNESMonitorSet()`, with this function as an argument, to cause the monitor
26: to be used during the `SNESSolve()`
28: .seealso: [](ch_snes), `SNES`, `SNESMonitorSet()`, `SNESMonitorDefault()`, `VecView()`
29: @*/
30: PetscErrorCode SNESMonitorSolution(SNES snes, PetscInt its, PetscReal fgnorm, PetscViewerAndFormat *vf)
31: {
32: Vec x;
33: PetscViewer viewer = vf->viewer;
35: PetscFunctionBegin;
37: PetscCall(SNESGetSolution(snes, &x));
38: PetscCall(PetscViewerPushFormat(viewer, vf->format));
39: PetscCall(VecView(x, viewer));
40: PetscCall(PetscViewerPopFormat(viewer));
41: PetscFunctionReturn(PETSC_SUCCESS);
42: }
44: /*@C
45: SNESMonitorResidual - Monitors progress of a `SNESSolve()` by calling
46: `VecView()` for the residual at each iteration.
48: Collective
50: Input Parameters:
51: + snes - the `SNES` context
52: . its - iteration number
53: . fgnorm - 2-norm of residual
54: - vf - a viewer
56: Options Database Key:
57: . -snes_monitor_residual [ascii binary draw][:filename][:viewer format] - plots residual (not its norm) at each iteration
59: Level: intermediate
61: Note:
62: This is not called directly by users, rather one calls `SNESMonitorSet()`, with this function as an argument, to cause the monitor
63: to be used during the `SNES` solve.
65: .seealso: [](ch_snes), `SNES`, `SNESMonitorSet()`, `SNESMonitorDefault()`, `VecView()`, `SNESMonitor()`
66: @*/
67: PetscErrorCode SNESMonitorResidual(SNES snes, PetscInt its, PetscReal fgnorm, PetscViewerAndFormat *vf)
68: {
69: Vec x;
71: PetscFunctionBegin;
73: PetscCall(SNESGetFunction(snes, &x, NULL, NULL));
74: PetscCall(PetscViewerPushFormat(vf->viewer, vf->format));
75: PetscCall(VecView(x, vf->viewer));
76: PetscCall(PetscViewerPopFormat(vf->viewer));
77: PetscFunctionReturn(PETSC_SUCCESS);
78: }
80: /*@C
81: SNESMonitorSolutionUpdate - Monitors progress of a `SNESSolve()` by calling
82: `VecView()` for the UPDATE to the solution at each iteration.
84: Collective
86: Input Parameters:
87: + snes - the `SNES` context
88: . its - iteration number
89: . fgnorm - 2-norm of residual
90: - vf - a viewer
92: Options Database Key:
93: . -snes_monitor_solution_update [ascii binary draw][:filename][:viewer format] - plots update to solution at each iteration
95: Level: intermediate
97: Note:
98: This is not called directly by users, rather one calls `SNESMonitorSet()`, with this function as an argument, to cause the monitor
99: to be used during the `SNES` solve.
101: .seealso: [](ch_snes), `SNESMonitorSet()`, `SNESMonitorDefault()`, `VecView()`, `SNESMonitor()`
102: @*/
103: PetscErrorCode SNESMonitorSolutionUpdate(SNES snes, PetscInt its, PetscReal fgnorm, PetscViewerAndFormat *vf)
104: {
105: Vec x;
106: PetscViewer viewer = vf->viewer;
108: PetscFunctionBegin;
110: PetscCall(SNESGetSolutionUpdate(snes, &x));
111: PetscCall(PetscViewerPushFormat(viewer, vf->format));
112: PetscCall(VecView(x, viewer));
113: PetscCall(PetscViewerPopFormat(viewer));
114: PetscFunctionReturn(PETSC_SUCCESS);
115: }
117: #include <petscdraw.h>
119: /*@C
120: KSPMonitorSNESResidual - Prints the `SNES` residual norm, as well as the `KSP` residual norm, at each iteration of a `KSPSolve()` called within a `SNESSolve()`.
122: Collective
124: Input Parameters:
125: + ksp - iterative context
126: . n - iteration number
127: . rnorm - 2-norm (preconditioned) residual value (may be estimated).
128: - vf - The viewer context
130: Options Database Key:
131: . -snes_monitor_ksp - Activates `KSPMonitorSNESResidual()`
133: Level: intermediate
135: Note:
136: This is not called directly by users, rather one calls `KSPMonitorSet()`, with this function as an argument, to cause the monitor
137: to be used during the `KSP` solve.
139: .seealso: [](ch_snes), `SNES`, `KSPMonitorSet()`, `KSPMonitorResidual()`, `KSPMonitorTrueResidualMaxNorm()`, `KSPMonitor()`, `SNESMonitor()`, `PetscViewerAndFormat()`
140: @*/
141: PetscErrorCode KSPMonitorSNESResidual(KSP ksp, PetscInt n, PetscReal rnorm, PetscViewerAndFormat *vf)
142: {
143: PetscViewer viewer = vf->viewer;
144: PetscViewerFormat format = vf->format;
145: SNES snes = (SNES)vf->data;
146: Vec snes_solution, work1, work2;
147: PetscReal snorm;
148: PetscInt tablevel;
149: const char *prefix;
151: PetscFunctionBegin;
153: PetscCall(SNESGetSolution(snes, &snes_solution));
154: PetscCall(VecDuplicate(snes_solution, &work1));
155: PetscCall(VecDuplicate(snes_solution, &work2));
156: PetscCall(KSPBuildSolution(ksp, work1, NULL));
157: PetscCall(VecAYPX(work1, -1.0, snes_solution));
158: PetscCall(SNESComputeFunction(snes, work1, work2));
159: PetscCall(VecNorm(work2, NORM_2, &snorm));
160: PetscCall(VecDestroy(&work1));
161: PetscCall(VecDestroy(&work2));
163: PetscCall(PetscObjectGetTabLevel((PetscObject)ksp, &tablevel));
164: PetscCall(PetscObjectGetOptionsPrefix((PetscObject)ksp, &prefix));
165: PetscCall(PetscViewerPushFormat(viewer, format));
166: PetscCall(PetscViewerASCIIAddTab(viewer, tablevel));
167: if (n == 0 && prefix) PetscCall(PetscViewerASCIIPrintf(viewer, " Residual norms for %s solve.\n", prefix));
168: PetscCall(PetscViewerASCIIPrintf(viewer, "%3" PetscInt_FMT " SNES Residual norm %5.3e KSP Residual norm %5.3e\n", n, (double)snorm, (double)rnorm));
169: PetscCall(PetscViewerASCIISubtractTab(viewer, tablevel));
170: PetscCall(PetscViewerPopFormat(viewer));
171: PetscFunctionReturn(PETSC_SUCCESS);
172: }
174: /*@C
175: KSPMonitorSNESResidualDrawLG - Plots the linear `KSP` residual norm and the `SNES` residual norm of a `KSPSolve()` called within a `SNESSolve()`.
177: Collective
179: Input Parameters:
180: + ksp - iterative context
181: . n - iteration number
182: . rnorm - 2-norm (preconditioned) residual value (may be estimated).
183: - vf - The viewer context, created with `KSPMonitorSNESResidualDrawLGCreate()`
185: Options Database Key:
186: . -snes_monitor_ksp draw::draw_lg - Activates `KSPMonitorSNESResidualDrawLG()`
188: Level: intermediate
190: Note:
191: This is not called directly by users, rather one calls `SNESMonitorSet()`, with this function as an argument, to cause the monitor
192: to be used during the `SNESSolve()`
194: .seealso: [](ch_snes), `KSPMonitorSet()`, `KSPMonitorTrueResidual()`, `SNESMonitor()`, `KSPMonitor()`, `KSPMonitorSNESResidualDrawLGCreate()`
195: @*/
196: PetscErrorCode KSPMonitorSNESResidualDrawLG(KSP ksp, PetscInt n, PetscReal rnorm, PetscViewerAndFormat *vf)
197: {
198: PetscViewer viewer = vf->viewer;
199: PetscViewerFormat format = vf->format;
200: PetscDrawLG lg;
201: SNES snes = (SNES)vf->data;
202: Vec snes_solution, work1, work2;
203: PetscReal snorm;
204: KSPConvergedReason reason;
205: PetscReal x[2], y[2];
207: PetscFunctionBegin;
209: PetscCall(PetscViewerDrawGetDrawLG(viewer, 0, &lg));
210: PetscCall(SNESGetSolution(snes, &snes_solution));
211: PetscCall(VecDuplicate(snes_solution, &work1));
212: PetscCall(VecDuplicate(snes_solution, &work2));
213: PetscCall(KSPBuildSolution(ksp, work1, NULL));
214: PetscCall(VecAYPX(work1, -1.0, snes_solution));
215: PetscCall(SNESComputeFunction(snes, work1, work2));
216: PetscCall(VecNorm(work2, NORM_2, &snorm));
217: PetscCall(VecDestroy(&work1));
218: PetscCall(VecDestroy(&work2));
220: PetscCall(PetscViewerPushFormat(viewer, format));
221: if (!n) PetscCall(PetscDrawLGReset(lg));
222: x[0] = (PetscReal)n;
223: if (rnorm > 0.0) y[0] = PetscLog10Real(rnorm);
224: else y[0] = -15.0;
225: x[1] = (PetscReal)n;
226: if (snorm > 0.0) y[1] = PetscLog10Real(snorm);
227: else y[1] = -15.0;
228: PetscCall(PetscDrawLGAddPoint(lg, x, y));
229: PetscCall(KSPGetConvergedReason(ksp, &reason));
230: if (n <= 20 || !(n % 5) || reason) {
231: PetscCall(PetscDrawLGDraw(lg));
232: PetscCall(PetscDrawLGSave(lg));
233: }
234: PetscCall(PetscViewerPopFormat(viewer));
235: PetscFunctionReturn(PETSC_SUCCESS);
236: }
238: /*@C
239: KSPMonitorSNESResidualDrawLGCreate - Creates the `PetscViewer` used by `KSPMonitorSNESResidualDrawLG()`
241: Collective
243: Input Parameters:
244: + viewer - The `PetscViewer`
245: . format - The viewer format
246: - ctx - An optional user context
248: Output Parameter:
249: . vf - The viewer context
251: Level: intermediate
253: .seealso: [](ch_snes), `KSP`, `SNES`, `PetscViewerFormat`, `PetscViewerAndFormat`, `KSPMonitorSet()`, `KSPMonitorTrueResidual()`
254: @*/
255: PetscErrorCode KSPMonitorSNESResidualDrawLGCreate(PetscViewer viewer, PetscViewerFormat format, PetscCtx ctx, PetscViewerAndFormat **vf)
256: {
257: const char *names[] = {"linear", "nonlinear"};
259: PetscFunctionBegin;
260: PetscCall(PetscViewerAndFormatCreate(viewer, format, vf));
261: (*vf)->data = ctx;
262: PetscCall(PetscViewerMonitorLGSetUp(viewer, NULL, NULL, "Log Residual Norm", 2, names, PETSC_DECIDE, PETSC_DECIDE, 400, 300));
263: PetscFunctionReturn(PETSC_SUCCESS);
264: }
266: PetscErrorCode SNESMonitorDefaultSetUp(SNES snes, PetscViewerAndFormat *vf)
267: {
268: PetscFunctionBegin;
269: if (vf->format == PETSC_VIEWER_DRAW_LG) PetscCall(PetscViewerMonitorLGSetUp(vf->viewer, NULL, NULL, "Log Residual Norm", 1, NULL, PETSC_DECIDE, PETSC_DECIDE, 400, 300));
270: PetscFunctionReturn(PETSC_SUCCESS);
271: }
273: /*@C
274: SNESMonitorDefault - Monitors progress of a `SNESSolve()` (default).
276: Collective
278: Input Parameters:
279: + snes - the `SNES` context
280: . its - iteration number
281: . fgnorm - 2-norm of residual
282: - vf - viewer and format structure
284: Options Database Key:
285: . -snes_monitor - use this function to monitor the convergence of the nonlinear solver
287: Level: intermediate
289: Notes:
290: Prints the residual norm at each iteration.
292: This is not called directly by users, rather one calls `SNESMonitorSet()`, with this function as an argument, to cause the monitor
293: to be used during the `SNES` solve.
295: .seealso: [](ch_snes), `SNESMonitorSet()`, `SNESMonitorSolution()`, `SNESMonitorFunction()`, `SNESMonitorResidual()`,
296: `SNESMonitorSolutionUpdate()`, `SNESMonitorScaling()`, `SNESMonitorRange()`, `SNESMonitorRatio()`,
297: `SNESMonitorDefaultField()`, `PetscViewerFormat`, `PetscViewerAndFormat`
298: @*/
299: PetscErrorCode SNESMonitorDefault(SNES snes, PetscInt its, PetscReal fgnorm, PetscViewerAndFormat *vf)
300: {
301: PetscViewer viewer = vf->viewer;
302: PetscViewerFormat format = vf->format;
303: PetscBool isascii, isdraw;
305: PetscFunctionBegin;
307: PetscCall(PetscObjectTypeCompare((PetscObject)viewer, PETSCVIEWERASCII, &isascii));
308: PetscCall(PetscObjectTypeCompare((PetscObject)viewer, PETSCVIEWERDRAW, &isdraw));
309: PetscCall(PetscViewerPushFormat(viewer, format));
310: if (isascii) {
311: PetscCall(PetscViewerASCIIAddTab(viewer, ((PetscObject)snes)->tablevel));
312: if (format == PETSC_VIEWER_ASCII_INFO_DETAIL) {
313: Vec dx;
314: PetscReal upnorm;
315: SNESObjectiveFn *objective;
317: PetscCall(SNESGetSolutionUpdate(snes, &dx));
318: PetscCall(VecNorm(dx, NORM_2, &upnorm));
319: PetscCall(SNESGetObjective(snes, &objective, NULL));
320: if (objective) {
321: Vec x;
322: PetscReal obj;
324: PetscCall(SNESGetSolution(snes, &x));
325: PetscCall(SNESComputeObjective(snes, x, &obj));
326: PetscCall(PetscViewerASCIIPrintf(viewer, "%3" PetscInt_FMT " SNES Function norm %14.12e, Update norm %14.12e, Objective %14.12e\n", its, (double)fgnorm, (double)upnorm, (double)obj));
327: } else {
328: PetscCall(PetscViewerASCIIPrintf(viewer, "%3" PetscInt_FMT " SNES Function norm %14.12e, Update norm %14.12e\n", its, (double)fgnorm, (double)upnorm));
329: }
330: } else {
331: PetscCall(PetscViewerASCIIPrintf(viewer, "%3" PetscInt_FMT " SNES Function norm %14.12e\n", its, (double)fgnorm));
332: }
333: PetscCall(PetscViewerASCIISubtractTab(viewer, ((PetscObject)snes)->tablevel));
334: } else if (isdraw) {
335: if (format == PETSC_VIEWER_DRAW_LG) {
336: PetscDrawLG lg;
337: PetscReal x, y;
339: PetscCall(PetscViewerDrawGetDrawLG(viewer, 0, &lg));
340: if (!its) PetscCall(PetscDrawLGReset(lg));
341: x = (PetscReal)its;
342: if (fgnorm > 0.0) y = PetscLog10Real(fgnorm);
343: else y = -15.0;
344: PetscCall(PetscDrawLGAddPoint(lg, &x, &y));
345: if (its <= 20 || !(its % 5) || snes->reason) {
346: PetscCall(PetscDrawLGDraw(lg));
347: PetscCall(PetscDrawLGSave(lg));
348: }
349: }
350: }
351: PetscCall(PetscViewerPopFormat(viewer));
352: PetscFunctionReturn(PETSC_SUCCESS);
353: }
355: /*@C
356: SNESMonitorScaling - Monitors the largest value in each row of the Jacobian of a `SNESSolve()`
358: Collective
360: Input Parameters:
361: + snes - the `SNES` context
362: . its - iteration number
363: . fgnorm - 2-norm of residual
364: - vf - viewer and format structure
366: Level: intermediate
368: Notes:
369: This routine prints the largest value in each row of the Jacobian
371: This is not called directly by users, rather one calls `SNESMonitorSet()`, with this function as an argument, to cause the monitor
372: to be used during the `SNES` solve.
374: .seealso: [](ch_snes), `SNESMonitorSet()`, `SNESMonitorSolution()`, `SNESMonitorRange()`, `SNESMonitorJacUpdateSpectrum()`,
375: `PetscViewerFormat`, `PetscViewerAndFormat`
376: @*/
377: PetscErrorCode SNESMonitorScaling(SNES snes, PetscInt its, PetscReal fgnorm, PetscViewerAndFormat *vf)
378: {
379: PetscViewer viewer = vf->viewer;
380: KSP ksp;
381: Mat J;
382: Vec v;
384: PetscFunctionBegin;
386: PetscCall(SNESGetKSP(snes, &ksp));
387: PetscCall(KSPGetOperators(ksp, &J, NULL));
388: PetscCall(MatCreateVecs(J, &v, NULL));
389: PetscCall(MatGetRowMaxAbs(J, v, NULL));
390: PetscCall(PetscViewerPushFormat(viewer, vf->format));
391: PetscCall(PetscViewerASCIIAddTab(viewer, ((PetscObject)snes)->tablevel));
392: PetscCall(PetscViewerASCIIPrintf(viewer, "SNES Jacobian maximum row entries\n"));
393: PetscCall(VecView(v, viewer));
394: PetscCall(PetscViewerASCIISubtractTab(viewer, ((PetscObject)snes)->tablevel));
395: PetscCall(PetscViewerPopFormat(viewer));
396: PetscCall(VecDestroy(&v));
397: PetscFunctionReturn(PETSC_SUCCESS);
398: }
400: /*@C
401: SNESMonitorJacUpdateSpectrum - Monitors the spectrun of the change in the Jacobian from the last Jacobian evaluation of a `SNESSolve()`
403: Collective
405: Input Parameters:
406: + snes - the `SNES` context
407: . it - iteration number
408: . fnorm - 2-norm of residual
409: - vf - viewer and format structure
411: Options Database Key:
412: . -snes_monitor_jacupdate_spectrum - activates this monitor
414: Level: intermediate
416: Notes:
417: This routine prints the eigenvalues of the difference in the Jacobians
419: This is not called directly by users, rather one calls `SNESMonitorSet()`, with this function as an argument, to cause the monitor
420: to be used during the `SNES` solve.
422: .seealso: [](ch_snes), `SNESMonitorSet()`, `SNESMonitorSolution()`, `SNESMonitorRange()`, `PetscViewerFormat`, `PetscViewerAndFormat`
423: @*/
424: PetscErrorCode SNESMonitorJacUpdateSpectrum(SNES snes, PetscInt it, PetscReal fnorm, PetscViewerAndFormat *vf)
425: {
426: Vec X;
427: Mat J, dJ, dJdense;
428: PetscErrorCode (*func)(SNES, Vec, Mat, Mat, void *);
429: PetscInt n;
430: PetscBLASInt nb = 0, lwork;
431: PetscReal *eigr, *eigi;
432: PetscScalar *work;
433: PetscScalar *a;
435: PetscFunctionBegin;
436: if (it == 0) PetscFunctionReturn(PETSC_SUCCESS);
437: /* create the difference between the current update and the current Jacobian */
438: PetscCall(SNESGetSolution(snes, &X));
439: PetscCall(SNESGetJacobian(snes, NULL, &J, &func, NULL));
440: PetscCall(MatDuplicate(J, MAT_COPY_VALUES, &dJ));
441: PetscCall(SNESComputeJacobian(snes, X, dJ, dJ));
442: PetscCall(MatAXPY(dJ, -1.0, J, SAME_NONZERO_PATTERN));
444: /* compute the spectrum directly */
445: PetscCall(MatConvert(dJ, MATSEQDENSE, MAT_INITIAL_MATRIX, &dJdense));
446: PetscCall(MatGetSize(dJ, &n, NULL));
447: PetscCall(PetscBLASIntCast(n, &nb));
448: lwork = 3 * nb;
449: PetscCall(PetscMalloc1(n, &eigr));
450: PetscCall(PetscMalloc1(n, &eigi));
451: PetscCall(PetscMalloc1(lwork, &work));
452: PetscCall(MatDenseGetArray(dJdense, &a));
453: #if !defined(PETSC_USE_COMPLEX)
454: {
455: PetscInt i;
456: PetscCall(PetscFPTrapPush(PETSC_FP_TRAP_OFF));
457: PetscCallLAPACKInfo("LAPACKgeev", LAPACKgeev_("N", "N", &nb, a, &nb, eigr, eigi, NULL, &nb, NULL, &nb, work, &lwork, &info));
458: PetscCall(PetscFPTrapPop());
459: PetscCall(PetscPrintf(PetscObjectComm((PetscObject)snes), "Eigenvalues of J_%" PetscInt_FMT " - J_%" PetscInt_FMT ":\n", it, it - 1));
460: for (i = 0; i < n; i++) PetscCall(PetscPrintf(PetscObjectComm((PetscObject)snes), "%5" PetscInt_FMT ": %20.5g + %20.5gi\n", i, (double)eigr[i], (double)eigi[i]));
461: }
462: PetscCall(MatDenseRestoreArray(dJdense, &a));
463: PetscCall(MatDestroy(&dJ));
464: PetscCall(MatDestroy(&dJdense));
465: PetscCall(PetscFree(eigr));
466: PetscCall(PetscFree(eigi));
467: PetscCall(PetscFree(work));
468: PetscFunctionReturn(PETSC_SUCCESS);
469: #else
470: SETERRQ(PETSC_COMM_SELF, PETSC_ERR_SUP, "Not coded for complex");
471: #endif
472: }
474: PETSC_INTERN PetscErrorCode SNESMonitorRange_Private(SNES, PetscInt, PetscReal *);
476: PetscErrorCode SNESMonitorRange_Private(SNES snes, PetscInt it, PetscReal *per)
477: {
478: Vec resid;
479: PetscReal rmax, pwork;
480: PetscInt i, n, N;
481: PetscScalar *r;
483: PetscFunctionBegin;
484: PetscCall(SNESGetFunction(snes, &resid, NULL, NULL));
485: PetscCall(VecNorm(resid, NORM_INFINITY, &rmax));
486: PetscCall(VecGetLocalSize(resid, &n));
487: PetscCall(VecGetSize(resid, &N));
488: PetscCall(VecGetArray(resid, &r));
489: pwork = 0.0;
490: for (i = 0; i < n; i++) pwork += (PetscAbsScalar(r[i]) > .20 * rmax);
491: PetscCallMPI(MPIU_Allreduce(&pwork, per, 1, MPIU_REAL, MPIU_SUM, PetscObjectComm((PetscObject)snes)));
492: PetscCall(VecRestoreArray(resid, &r));
493: *per = *per / N;
494: PetscFunctionReturn(PETSC_SUCCESS);
495: }
497: /*@C
498: SNESMonitorRange - Prints the percentage of residual elements that are more than 10 percent of the maximum entry in the residual in each iteration of a `SNESSolve()`
500: Collective
502: Input Parameters:
503: + snes - `SNES` iterative context
504: . it - iteration number
505: . rnorm - 2-norm (preconditioned) residual value (may be estimated).
506: - vf - unused monitor context
508: Options Database Key:
509: . -snes_monitor_range - Activates `SNESMonitorRange()`
511: Level: intermediate
513: Note:
514: This is not called directly by users, rather one calls `SNESMonitorSet()`, with this function as an argument, to cause the monitor
515: to be used during the `SNES` solve.
517: .seealso: [](ch_snes), `SNESMonitorSet()`, `SNESMonitorDefault()`, `SNESMonitorLGCreate()`, `SNESMonitorScaling()`, `PetscViewerFormat`, `PetscViewerAndFormat`
518: @*/
519: PetscErrorCode SNESMonitorRange(SNES snes, PetscInt it, PetscReal rnorm, PetscViewerAndFormat *vf)
520: {
521: PetscReal perc, rel;
522: PetscViewer viewer = vf->viewer;
523: /* should be in a MonitorRangeContext */
524: static PetscReal prev;
526: PetscFunctionBegin;
528: if (!it) prev = rnorm;
529: PetscCall(SNESMonitorRange_Private(snes, it, &perc));
531: rel = (prev - rnorm) / prev;
532: prev = rnorm;
533: PetscCall(PetscViewerPushFormat(viewer, vf->format));
534: PetscCall(PetscViewerASCIIAddTab(viewer, ((PetscObject)snes)->tablevel));
535: PetscCall(PetscViewerASCIIPrintf(viewer, "%3" PetscInt_FMT " SNES preconditioned resid norm %14.12e Percent values above 20 percent of maximum %5.2g relative decrease %5.2e ratio %5.2e\n", it, (double)rnorm, (double)(100 * perc), (double)rel, (double)(rel / perc)));
536: PetscCall(PetscViewerASCIISubtractTab(viewer, ((PetscObject)snes)->tablevel));
537: PetscCall(PetscViewerPopFormat(viewer));
538: PetscFunctionReturn(PETSC_SUCCESS);
539: }
541: /*@C
542: SNESMonitorRatio - Monitors progress of a `SNESSolve()` by printing the ratio of residual norm at each iteration to the previous.
544: Collective
546: Input Parameters:
547: + snes - the `SNES` context
548: . its - iteration number
549: . fgnorm - 2-norm of residual (or gradient)
550: - vf - context of monitor
552: Options Database Key:
553: . -snes_monitor_ratio - activate this monitor
555: Level: intermediate
557: Notes:
558: This is not called directly by users, rather one calls `SNESMonitorSet()`, with this function as an argument, to cause the monitor
559: to be used during the `SNES` solve.
561: Be sure to call `SNESMonitorRationSetUp()` before using this monitor.
563: .seealso: [](ch_snes), `SNESMonitorRationSetUp()`, `SNESMonitorSet()`, `SNESMonitorSolution()`, `SNESMonitorDefault()`, `PetscViewerFormat`, `PetscViewerAndFormat`
564: @*/
565: PetscErrorCode SNESMonitorRatio(SNES snes, PetscInt its, PetscReal fgnorm, PetscViewerAndFormat *vf)
566: {
567: PetscInt len;
568: PetscReal *history;
569: PetscViewer viewer = vf->viewer;
571: PetscFunctionBegin;
572: PetscCall(SNESGetConvergenceHistory(snes, &history, NULL, &len));
573: PetscCall(PetscViewerPushFormat(viewer, vf->format));
574: PetscCall(PetscViewerASCIIAddTab(viewer, ((PetscObject)snes)->tablevel));
575: if (!its || !history || its > len) {
576: PetscCall(PetscViewerASCIIPrintf(viewer, "%3" PetscInt_FMT " SNES Function norm %14.12e\n", its, (double)fgnorm));
577: } else {
578: PetscReal ratio = fgnorm / history[its - 1];
579: PetscCall(PetscViewerASCIIPrintf(viewer, "%3" PetscInt_FMT " SNES Function norm %14.12e %14.12e\n", its, (double)fgnorm, (double)ratio));
580: }
581: PetscCall(PetscViewerASCIISubtractTab(viewer, ((PetscObject)snes)->tablevel));
582: PetscCall(PetscViewerPopFormat(viewer));
583: PetscFunctionReturn(PETSC_SUCCESS);
584: }
586: /*@C
587: SNESMonitorRatioSetUp - Insures the `SNES` object is saving its history since this monitor needs access to it
589: Collective
591: Input Parameters:
592: + snes - the `SNES` context
593: - vf - `PetscViewerAndFormat` (ignored)
595: Level: intermediate
597: .seealso: [](ch_snes), `SNESMonitorSet()`, `SNESMonitorSolution()`, `SNESMonitorDefault()`, `SNESMonitorRatio()`, `PetscViewerFormat`, `PetscViewerAndFormat`
598: @*/
599: PetscErrorCode SNESMonitorRatioSetUp(SNES snes, PetscViewerAndFormat *vf)
600: {
601: PetscReal *history;
603: PetscFunctionBegin;
604: PetscCall(SNESGetConvergenceHistory(snes, &history, NULL, NULL));
605: if (!history) PetscCall(SNESSetConvergenceHistory(snes, NULL, NULL, 100, PETSC_TRUE));
606: PetscFunctionReturn(PETSC_SUCCESS);
607: }
609: /*
610: Default (short) SNES Monitor, same as SNESMonitorDefault() except
611: it prints fewer digits of the residual as the residual gets smaller.
612: This is because the later digits are meaningless and are often
613: different on different machines; by using this routine different
614: machines will usually generate the same output.
616: Deprecated: Intentionally has no manual page
617: */
618: PetscErrorCode SNESMonitorDefaultShort(SNES snes, PetscInt its, PetscReal fgnorm, PetscViewerAndFormat *vf)
619: {
620: PetscViewer viewer = vf->viewer;
622: PetscFunctionBegin;
624: PetscCall(PetscViewerPushFormat(viewer, vf->format));
625: PetscCall(PetscViewerASCIIAddTab(viewer, ((PetscObject)snes)->tablevel));
626: if (fgnorm > 1.e-9) {
627: PetscCall(PetscViewerASCIIPrintf(viewer, "%3" PetscInt_FMT " SNES Function norm %g\n", its, (double)fgnorm));
628: } else if (fgnorm > 1.e-11) {
629: PetscCall(PetscViewerASCIIPrintf(viewer, "%3" PetscInt_FMT " SNES Function norm %5.3e\n", its, (double)fgnorm));
630: } else {
631: PetscCall(PetscViewerASCIIPrintf(viewer, "%3" PetscInt_FMT " SNES Function norm < 1.e-11\n", its));
632: }
633: PetscCall(PetscViewerASCIISubtractTab(viewer, ((PetscObject)snes)->tablevel));
634: PetscCall(PetscViewerPopFormat(viewer));
635: PetscFunctionReturn(PETSC_SUCCESS);
636: }
638: /*@C
639: SNESMonitorDefaultField - Monitors progress of a `SNESSolve()`, separated into fields.
641: Collective
643: Input Parameters:
644: + snes - the `SNES` context
645: . its - iteration number
646: . fgnorm - 2-norm of residual
647: - vf - the PetscViewer
649: Options Database Key:
650: . -snes_monitor_field - activate this monitor
652: Level: intermediate
654: Notes:
655: This routine uses the `DM` attached to the residual vector to define the fields.
657: This is not called directly by users, rather one calls `SNESMonitorSet()`, with this function as an argument, to cause the monitor
658: to be used during the `SNES` solve.
660: .seealso: [](ch_snes), `SNESMonitorSet()`, `SNESMonitorSolution()`, `SNESMonitorDefault()`, `PetscViewerFormat`, `PetscViewerAndFormat`
661: @*/
662: PetscErrorCode SNESMonitorDefaultField(SNES snes, PetscInt its, PetscReal fgnorm, PetscViewerAndFormat *vf)
663: {
664: PetscViewer viewer = vf->viewer;
665: Vec r;
666: DM dm;
667: PetscReal res[256];
668: PetscInt tablevel;
670: PetscFunctionBegin;
672: PetscCall(SNESGetFunction(snes, &r, NULL, NULL));
673: PetscCall(VecGetDM(r, &dm));
674: if (!dm) PetscCall(SNESMonitorDefault(snes, its, fgnorm, vf));
675: else {
676: PetscSection s, gs;
677: PetscInt Nf;
679: PetscCall(DMGetLocalSection(dm, &s));
680: PetscCall(DMGetGlobalSection(dm, &gs));
681: if (!s || !gs) PetscCall(SNESMonitorDefault(snes, its, fgnorm, vf));
682: PetscCall(PetscSectionGetNumFields(s, &Nf));
683: PetscCheck(Nf <= 256, PetscObjectComm((PetscObject)snes), PETSC_ERR_SUP, "Do not support %" PetscInt_FMT " fields > 256", Nf);
684: PetscCall(PetscSectionVecNorm(s, gs, r, NORM_2, res));
685: PetscCall(PetscObjectGetTabLevel((PetscObject)snes, &tablevel));
686: PetscCall(PetscViewerPushFormat(viewer, vf->format));
687: PetscCall(PetscViewerASCIIAddTab(viewer, tablevel));
688: PetscCall(PetscViewerASCIIPrintf(viewer, "%3" PetscInt_FMT " SNES Function norm %14.12e [", its, (double)fgnorm));
689: for (PetscInt f = 0; f < Nf; ++f) {
690: if (f) PetscCall(PetscViewerASCIIPrintf(viewer, ", "));
691: PetscCall(PetscViewerASCIIPrintf(viewer, "%14.12e", (double)res[f]));
692: }
693: PetscCall(PetscViewerASCIIPrintf(viewer, "] \n"));
694: PetscCall(PetscViewerASCIISubtractTab(viewer, tablevel));
695: PetscCall(PetscViewerPopFormat(viewer));
696: }
697: PetscFunctionReturn(PETSC_SUCCESS);
698: }
700: /*@C
701: SNESConvergedDefault - Default convergence test for `SNESSolve()`.
703: Collective
705: Input Parameters:
706: + snes - the `SNES` context
707: . it - the iteration (0 indicates before any Newton steps)
708: . xnorm - 2-norm of current iterate
709: . snorm - 2-norm of current step
710: . fnorm - 2-norm of function at current iterate
711: - ctx - unused context
713: Output Parameter:
714: . reason - converged reason, see `SNESConvergedReason`
716: Options Database Keys:
717: + -snes_convergence_test default - see `SNESSetFromOptions()`
718: . -snes_stol - convergence tolerance in terms of the norm of the change in the solution between steps
719: . -snes_atol abstol - absolute tolerance of residual norm
720: . -snes_rtol rtol - relative decrease in tolerance norm from the initial 2-norm of the solution
721: . -snes_divergence_tolerance divtol - if the residual goes above divtol*rnorm0, exit with divergence
722: . -snes_max_funcs max_funcs - maximum number of function evaluations, use `unlimited` for no maximum
723: . -snes_max_fail max_fail - maximum number of line search failures allowed before stopping, default is none
724: - -snes_max_linear_solve_fail - number of linear solver failures before `SNESSolve()` stops
726: Level: developer
728: Notes:
729: This routine is not generally called directly. It is set with `SNESSetConvergenceTest()` automatically before the `SNESSolve()`.
731: It can be called within a custom convergence test that should also apply the standard convergence tests
733: .seealso: [](ch_snes), `SNES`, `SNESSolve()`, `SNESSetConvergenceTest()`, `SNESConvergedSkip()`, `SNESSetTolerances()`, `SNESSetDivergenceTolerance()`,
734: `SNESConvergedReason`
735: @*/
736: PetscErrorCode SNESConvergedDefault(SNES snes, PetscInt it, PetscReal xnorm, PetscReal snorm, PetscReal fnorm, SNESConvergedReason *reason, PetscCtx ctx)
737: {
738: PetscFunctionBegin;
740: PetscAssertPointer(reason, 6);
742: *reason = SNES_CONVERGED_ITERATING;
743: if (!it) {
744: /* set parameter for default relative tolerance convergence test */
745: snes->ttol = fnorm * snes->rtol;
746: snes->rnorm0 = fnorm;
747: }
748: if (PetscIsInfOrNanReal(fnorm)) {
749: PetscCall(PetscInfo(snes, "Failed to converged, function norm is NaN\n"));
750: *reason = SNES_DIVERGED_FUNCTION_NANORINF;
751: } else if (fnorm < snes->abstol && (it || !snes->forceiteration)) {
752: PetscCall(PetscInfo(snes, "Converged due to function norm %14.12e < %14.12e\n", (double)fnorm, (double)snes->abstol));
753: *reason = SNES_CONVERGED_FNORM_ABS;
754: } else if (snes->nfuncs >= snes->max_funcs && snes->max_funcs >= 0) {
755: PetscCall(PetscInfo(snes, "Exceeded maximum number of function evaluations: %" PetscInt_FMT " > %" PetscInt_FMT "\n", snes->nfuncs, snes->max_funcs));
756: *reason = SNES_DIVERGED_FUNCTION_COUNT;
757: }
759: if (it && !*reason) {
760: if (fnorm <= snes->ttol) {
761: PetscCall(PetscInfo(snes, "Converged due to function norm %14.12e < %14.12e (relative tolerance)\n", (double)fnorm, (double)snes->ttol));
762: *reason = SNES_CONVERGED_FNORM_RELATIVE;
763: } else if (snorm < snes->stol * xnorm) {
764: PetscCall(PetscInfo(snes, "Converged due to small update length: %14.12e < %14.12e * %14.12e\n", (double)snorm, (double)snes->stol, (double)xnorm));
765: *reason = SNES_CONVERGED_SNORM_RELATIVE;
766: } else if (snes->divtol != PETSC_UNLIMITED && (fnorm > snes->divtol * snes->rnorm0)) {
767: PetscCall(PetscInfo(snes, "Diverged due to increase in function norm: %14.12e > %14.12e * %14.12e\n", (double)fnorm, (double)snes->divtol, (double)snes->rnorm0));
768: *reason = SNES_DIVERGED_DTOL;
769: }
770: }
771: PetscFunctionReturn(PETSC_SUCCESS);
772: }
774: /*@C
775: SNESConvergedSkip - Convergence test for `SNES` that NEVER returns as
776: converged, UNLESS the maximum number of iteration have been reached.
778: Logically Collective
780: Input Parameters:
781: + snes - the `SNES` context
782: . it - the iteration (0 indicates before any Newton steps)
783: . xnorm - 2-norm of current iterate
784: . snorm - 2-norm of current step
785: . fnorm - 2-norm of function at current iterate
786: - ctx - unused context
788: Output Parameter:
789: . reason - `SNES_CONVERGED_ITERATING`, `SNES_CONVERGED_ITS`, or `SNES_DIVERGED_FUNCTION_NANORINF`
791: Options Database Key:
792: . -snes_convergence_test skip - see `SNESSetFromOptions()`
794: Level: advanced
796: Note:
797: This is often used if `snes` is being used as a nonlinear smoother in `SNESFAS` or possibly other `SNESType`
799: .seealso: [](ch_snes), `SNES`, `SNESSolve()`, `SNESConvergedDefault()`, `SNESSetConvergenceTest()`, `SNESConvergedReason`
800: @*/
801: PetscErrorCode SNESConvergedSkip(SNES snes, PetscInt it, PetscReal xnorm, PetscReal snorm, PetscReal fnorm, SNESConvergedReason *reason, PetscCtx ctx)
802: {
803: PetscFunctionBegin;
805: PetscAssertPointer(reason, 6);
807: *reason = SNES_CONVERGED_ITERATING;
809: if (fnorm != fnorm) {
810: PetscCall(PetscInfo(snes, "Failed to converged, function norm is NaN\n"));
811: *reason = SNES_DIVERGED_FUNCTION_NANORINF;
812: } else if (it == snes->max_its) {
813: *reason = SNES_CONVERGED_ITS;
814: }
815: PetscFunctionReturn(PETSC_SUCCESS);
816: }
818: /*@
819: SNESSetWorkVecs - Allocates a number of work vectors to be used internally by the `SNES` solver
821: Input Parameters:
822: + snes - the `SNES` context
823: - nw - number of work vectors to allocate
825: Level: developer
827: Note:
828: Each `SNESType` calls this with the number of work vectors that particular type needs.
830: .seealso: [](ch_snes), `SNES`
831: @*/
832: PetscErrorCode SNESSetWorkVecs(SNES snes, PetscInt nw)
833: {
834: DM dm;
835: Vec v;
836: PetscBool restore = PETSC_FALSE;
838: PetscFunctionBegin;
841: if (snes->work) PetscCall(VecDestroyVecs(snes->nwork, &snes->work));
842: snes->nwork = nw;
843: if (!nw) PetscFunctionReturn(PETSC_SUCCESS);
845: PetscCall(SNESGetDM(snes, &dm));
846: if (snes->dmAuto) {
847: PetscCall(DMShellGetGlobalVector(dm, &v));
848: if (!v) v = snes->vec_sol;
849: if (!v) v = snes->vec_func;
850: if (!v) v = snes->vec_rhs;
851: } else {
852: restore = PETSC_TRUE;
853: PetscCall(DMGetGlobalVector(dm, &v));
854: }
855: PetscCheck(v, PetscObjectComm((PetscObject)snes), PETSC_ERR_SUP, "Vector to be duplicated not found");
856: PetscCall(VecDuplicateVecs(v, snes->nwork, &snes->work));
857: if (restore) PetscCall(DMRestoreGlobalVector(dm, &v));
858: PetscFunctionReturn(PETSC_SUCCESS);
859: }