Date: 2023-09-05T10:18:08+00:00

Actual source code: lmemon.c
slepc-3.19.2 2023-09-05
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      1: /*
      2:    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
      3:    SLEPc - Scalable Library for Eigenvalue Problem Computations
      4:    Copyright (c) 2002-, Universitat Politecnica de Valencia, Spain

      6:    This file is part of SLEPc.
      7:    SLEPc is distributed under a 2-clause BSD license (see LICENSE).
      8:    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
      9: */
     10: /*
     11:    LME routines related to monitors
     12: */

     14: #include <slepc/private/lmeimpl.h>
     15: #include <petscdraw.h>

     17: PetscErrorCode LMEMonitorLGCreate(MPI_Comm comm,const char host[],const char label[],const char metric[],PetscInt l,const char *names[],int x,int y,int m,int n,PetscDrawLG *lgctx)
     18: {
     19:   PetscDraw      draw;
     20:   PetscDrawAxis  axis;
     21:   PetscDrawLG    lg;

     23:   PetscFunctionBegin;
     24:   PetscCall(PetscDrawCreate(comm,host,label,x,y,m,n,&draw));
     25:   PetscCall(PetscDrawSetFromOptions(draw));
     26:   PetscCall(PetscDrawLGCreate(draw,l,&lg));
     27:   if (names) PetscCall(PetscDrawLGSetLegend(lg,names));
     28:   PetscCall(PetscDrawLGSetFromOptions(lg));
     29:   PetscCall(PetscDrawLGGetAxis(lg,&axis));
     30:   PetscCall(PetscDrawAxisSetLabels(axis,"Convergence","Iteration",metric));
     31:   PetscCall(PetscDrawDestroy(&draw));
     32:   *lgctx = lg;
     33:   PetscFunctionReturn(PETSC_SUCCESS);
     34: }

     36: /*
     37:    Runs the user provided monitor routines, if any.
     38: */
     39: PetscErrorCode LMEMonitor(LME lme,PetscInt it,PetscReal errest)
     40: {
     41:   PetscInt       i,n = lme->numbermonitors;

     43:   PetscFunctionBegin;
     44:   for (i=0;i<n;i++) PetscCall((*lme->monitor[i])(lme,it,errest,lme->monitorcontext[i]));
     45:   PetscFunctionReturn(PETSC_SUCCESS);
     46: }

     48: /*@C
     49:    LMEMonitorSet - Sets an ADDITIONAL function to be called at every
     50:    iteration to monitor convergence.

     52:    Logically Collective

     54:    Input Parameters:
     55: +  lme     - linear matrix equation solver context obtained from LMECreate()
     56: .  monitor - pointer to function (if this is NULL, it turns off monitoring)
     57: .  mctx    - [optional] context for private data for the
     58:              monitor routine (use NULL if no context is desired)
     59: -  monitordestroy - [optional] routine that frees monitor context (may be NULL)

     61:    Calling sequence of monitor:
     62: $  PetscErrorCode monitor(LME lme,PetscInt its,PetscReal errest,void*mctx)
     63: +  lme    - linear matrix equation solver context obtained from LMECreate()
     64: .  its    - iteration number
     65: .  errest - error estimate
     66: -  mctx   - optional monitoring context, as set by LMEMonitorSet()

     68:    Options Database Keys:
     69: +    -lme_monitor - print the error estimate
     70: .    -lme_monitor draw::draw_lg - sets line graph monitor for the error estimate
     71: -    -lme_monitor_cancel - cancels all monitors that have been hardwired into
     72:       a code by calls to LMEMonitorSet(), but does not cancel those set via
     73:       the options database.

     75:    Notes:
     76:    Several different monitoring routines may be set by calling
     77:    LMEMonitorSet() multiple times; all will be called in the
     78:    order in which they were set.

     80:    Level: intermediate

     82: .seealso: LMEMonitorCancel()
     83: @*/
     84: PetscErrorCode LMEMonitorSet(LME lme,PetscErrorCode (*monitor)(LME lme,PetscInt its,PetscReal errest,void*mctx),void *mctx,PetscErrorCode (*monitordestroy)(void**))
     85: {
     86:   PetscFunctionBegin;
     88:   PetscCheck(lme->numbermonitors<MAXLMEMONITORS,PetscObjectComm((PetscObject)lme),PETSC_ERR_ARG_OUTOFRANGE,"Too many LME monitors set");
     89:   lme->monitor[lme->numbermonitors]           = monitor;
     90:   lme->monitorcontext[lme->numbermonitors]    = (void*)mctx;
     91:   lme->monitordestroy[lme->numbermonitors++]  = monitordestroy;
     92:   PetscFunctionReturn(PETSC_SUCCESS);
     93: }

     95: /*@
     96:    LMEMonitorCancel - Clears all monitors for an LME object.

     98:    Logically Collective

    100:    Input Parameters:
    101: .  lme - linear matrix equation solver context obtained from LMECreate()

    103:    Options Database Key:
    104: .    -lme_monitor_cancel - cancels all monitors that have been hardwired
    105:       into a code by calls to LMEMonitorSet(),
    106:       but does not cancel those set via the options database.

    108:    Level: intermediate

    110: .seealso: LMEMonitorSet()
    111: @*/
    112: PetscErrorCode LMEMonitorCancel(LME lme)
    113: {
    114:   PetscInt       i;

    116:   PetscFunctionBegin;
    118:   for (i=0; i<lme->numbermonitors; i++) {
    119:     if (lme->monitordestroy[i]) PetscCall((*lme->monitordestroy[i])(&lme->monitorcontext[i]));
    120:   }
    121:   lme->numbermonitors = 0;
    122:   PetscFunctionReturn(PETSC_SUCCESS);
    123: }

    125: /*@C
    126:    LMEGetMonitorContext - Gets the monitor context, as set by
    127:    LMEMonitorSet() for the FIRST monitor only.

    129:    Not Collective

    131:    Input Parameter:
    132: .  lme - linear matrix equation solver context obtained from LMECreate()

    134:    Output Parameter:
    135: .  ctx - monitor context

    137:    Level: intermediate

    139: .seealso: LMEMonitorSet()
    140: @*/
    141: PetscErrorCode LMEGetMonitorContext(LME lme,void *ctx)
    142: {
    143:   PetscFunctionBegin;
    145:   *(void**)ctx = lme->monitorcontext[0];
    146:   PetscFunctionReturn(PETSC_SUCCESS);
    147: }

    149: /*@C
    150:    LMEMonitorDefault - Print the error estimate of the current approximation at each
    151:    iteration of the linear matrix equation solver.

    153:    Collective

    155:    Input Parameters:
    156: +  lme    - linear matrix equation solver context
    157: .  its    - iteration number
    158: .  errest - error estimate
    159: -  vf     - viewer and format for monitoring

    161:    Options Database Key:
    162: .  -lme_monitor - activates LMEMonitorDefault()

    164:    Level: intermediate

    166: .seealso: LMEMonitorSet()
    167: @*/
    168: PetscErrorCode LMEMonitorDefault(LME lme,PetscInt its,PetscReal errest,PetscViewerAndFormat *vf)
    169: {
    170:   PetscViewer    viewer = vf->viewer;

    172:   PetscFunctionBegin;
    175:   PetscCall(PetscViewerPushFormat(viewer,vf->format));
    176:   PetscCall(PetscViewerASCIIAddTab(viewer,((PetscObject)lme)->tablevel));
    177:   if (its == 1 && ((PetscObject)lme)->prefix) PetscCall(PetscViewerASCIIPrintf(viewer,"  Error estimates for %s solve.\n",((PetscObject)lme)->prefix));
    178:   PetscCall(PetscViewerASCIIPrintf(viewer,"%3" PetscInt_FMT " LME Error estimate %14.12e\n",its,(double)errest));
    179:   PetscCall(PetscViewerASCIISubtractTab(viewer,((PetscObject)lme)->tablevel));
    180:   PetscCall(PetscViewerPopFormat(viewer));
    181:   PetscFunctionReturn(PETSC_SUCCESS);
    182: }

    184: /*@C
    185:    LMEMonitorDefaultDrawLG - Plots the error estimate of the current approximation at each
    186:    iteration of the linear matrix equation solver.

    188:    Collective

    190:    Input Parameters:
    191: +  lme    - linear matrix equation solver context
    192: .  its    - iteration number
    193: .  errest - error estimate
    194: -  vf     - viewer and format for monitoring

    196:    Options Database Key:
    197: .  -lme_monitor draw::draw_lg - activates LMEMonitorDefaultDrawLG()

    199:    Level: intermediate

    201: .seealso: LMEMonitorSet()
    202: @*/
    203: PetscErrorCode LMEMonitorDefaultDrawLG(LME lme,PetscInt its,PetscReal errest,PetscViewerAndFormat *vf)
    204: {
    205:   PetscViewer    viewer = vf->viewer;
    206:   PetscDrawLG    lg = vf->lg;
    207:   PetscReal      x,y;

    209:   PetscFunctionBegin;
    213:   PetscCall(PetscViewerPushFormat(viewer,vf->format));
    214:   if (its==1) {
    215:     PetscCall(PetscDrawLGReset(lg));
    216:     PetscCall(PetscDrawLGSetDimension(lg,1));
    217:     PetscCall(PetscDrawLGSetLimits(lg,1,1.0,PetscLog10Real(lme->tol)-2,0.0));
    218:   }
    219:   x = (PetscReal)its;
    220:   if (errest > 0.0) y = PetscLog10Real(errest);
    221:   else y = 0.0;
    222:   PetscCall(PetscDrawLGAddPoint(lg,&x,&y));
    223:   if (its <= 20 || !(its % 5) || lme->reason) {
    224:     PetscCall(PetscDrawLGDraw(lg));
    225:     PetscCall(PetscDrawLGSave(lg));
    226:   }
    227:   PetscCall(PetscViewerPopFormat(viewer));
    228:   PetscFunctionReturn(PETSC_SUCCESS);
    229: }

    231: /*@C
    232:    LMEMonitorDefaultDrawLGCreate - Creates the plotter for the error estimate.

    234:    Collective

    236:    Input Parameters:
    237: +  viewer - the viewer
    238: .  format - the viewer format
    239: -  ctx    - an optional user context

    241:    Output Parameter:
    242: .  vf     - the viewer and format context

    244:    Level: intermediate

    246: .seealso: LMEMonitorSet()
    247: @*/
    248: PetscErrorCode LMEMonitorDefaultDrawLGCreate(PetscViewer viewer,PetscViewerFormat format,void *ctx,PetscViewerAndFormat **vf)
    249: {
    250:   PetscFunctionBegin;
    251:   PetscCall(PetscViewerAndFormatCreate(viewer,format,vf));
    252:   (*vf)->data = ctx;
    253:   PetscCall(LMEMonitorLGCreate(PetscObjectComm((PetscObject)viewer),NULL,"Error Estimate","Log Error Estimate",1,NULL,PETSC_DECIDE,PETSC_DECIDE,400,300,&(*vf)->lg));
    254:   PetscFunctionReturn(PETSC_SUCCESS);
    255: }