Date: 2021-02-01T14:42:19+00:00

Actual source code: mfnmon.c
slepc-3.14.2 2021-02-01
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      1: /*
      2:    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
      3:    SLEPc - Scalable Library for Eigenvalue Problem Computations
      4:    Copyright (c) 2002-2020, 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:    MFN routines related to monitors
     12: */

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

     17: /*
     18:    Runs the user provided monitor routines, if any.
     19: */
     20: PetscErrorCode MFNMonitor(MFN mfn,PetscInt it,PetscReal errest)
     21: {
     23:   PetscInt       i,n = mfn->numbermonitors;

     26:   for (i=0;i<n;i++) {
     27:     (*mfn->monitor[i])(mfn,it,errest,mfn->monitorcontext[i]);
     28:   }
     29:   return(0);
     30: }

     32: /*@C
     33:    MFNMonitorSet - Sets an ADDITIONAL function to be called at every
     34:    iteration to monitor convergence.

     36:    Logically Collective on mfn

     38:    Input Parameters:
     39: +  mfn     - matrix function context obtained from MFNCreate()
     40: .  monitor - pointer to function (if this is NULL, it turns off monitoring)
     41: .  mctx    - [optional] context for private data for the
     42:              monitor routine (use NULL if no context is desired)
     43: -  monitordestroy - [optional] routine that frees monitor context (may be NULL)

     45:    Calling Sequence of monitor:
     46: $   monitor(MFN mfn,int its,PetscReal errest,void *mctx)

     48: +  mfn    - matrix function context obtained from MFNCreate()
     49: .  its    - iteration number
     50: .  errest - error estimate
     51: -  mctx   - optional monitoring context, as set by MFNMonitorSet()

     53:    Options Database Keys:
     54: +    -mfn_monitor        - print the error estimate
     55: .    -mfn_monitor_lg     - sets line graph monitor for the error estimate
     56: -    -mfn_monitor_cancel - cancels all monitors that have been hardwired into
     57:       a code by calls to MFNMonitorSet(), but does not cancel those set via
     58:       the options database.

     60:    Notes:
     61:    Several different monitoring routines may be set by calling
     62:    MFNMonitorSet() multiple times; all will be called in the
     63:    order in which they were set.

     65:    Level: intermediate

     67: .seealso: MFNMonitorCancel()
     68: @*/
     69: PetscErrorCode MFNMonitorSet(MFN mfn,PetscErrorCode (*monitor)(MFN,PetscInt,PetscReal,void*),void *mctx,PetscErrorCode (*monitordestroy)(void**))
     70: {
     73:   if (mfn->numbermonitors >= MAXMFNMONITORS) SETERRQ(PetscObjectComm((PetscObject)mfn),PETSC_ERR_ARG_OUTOFRANGE,"Too many MFN monitors set");
     74:   mfn->monitor[mfn->numbermonitors]           = monitor;
     75:   mfn->monitorcontext[mfn->numbermonitors]    = (void*)mctx;
     76:   mfn->monitordestroy[mfn->numbermonitors++]  = monitordestroy;
     77:   return(0);
     78: }

     80: /*@
     81:    MFNMonitorCancel - Clears all monitors for an MFN object.

     83:    Logically Collective on mfn

     85:    Input Parameters:
     86: .  mfn - matrix function context obtained from MFNCreate()

     88:    Options Database Key:
     89: .    -mfn_monitor_cancel - Cancels all monitors that have been hardwired
     90:       into a code by calls to MFNMonitorSet(),
     91:       but does not cancel those set via the options database.

     93:    Level: intermediate

     95: .seealso: MFNMonitorSet()
     96: @*/
     97: PetscErrorCode MFNMonitorCancel(MFN mfn)
     98: {
    100:   PetscInt       i;

    104:   for (i=0; i<mfn->numbermonitors; i++) {
    105:     if (mfn->monitordestroy[i]) {
    106:       (*mfn->monitordestroy[i])(&mfn->monitorcontext[i]);
    107:     }
    108:   }
    109:   mfn->numbermonitors = 0;
    110:   return(0);
    111: }

    113: /*@C
    114:    MFNGetMonitorContext - Gets the monitor context, as set by
    115:    MFNMonitorSet() for the FIRST monitor only.

    117:    Not Collective

    119:    Input Parameter:
    120: .  mfn - matrix function context obtained from MFNCreate()

    122:    Output Parameter:
    123: .  ctx - monitor context

    125:    Level: intermediate

    127: .seealso: MFNMonitorSet()
    128: @*/
    129: PetscErrorCode MFNGetMonitorContext(MFN mfn,void **ctx)
    130: {
    133:   *ctx = mfn->monitorcontext[0];
    134:   return(0);
    135: }

    137: /*@C
    138:    MFNMonitorDefault - Print the error estimate of the current approximation at each
    139:    iteration of the matrix function solver.

    141:    Collective on mfn

    143:    Input Parameters:
    144: +  mfn    - matrix function context
    145: .  its    - iteration number
    146: .  errest - error estimate
    147: -  vf     - viewer and format for monitoring

    149:    Level: intermediate

    151: .seealso: MFNMonitorSet()
    152: @*/
    153: PetscErrorCode MFNMonitorDefault(MFN mfn,PetscInt its,PetscReal errest,PetscViewerAndFormat *vf)
    154: {
    156:   PetscViewer    viewer;

    161:   viewer = vf->viewer;
    163:   PetscViewerPushFormat(viewer,vf->format);
    164:   PetscViewerASCIIAddTab(viewer,((PetscObject)mfn)->tablevel);
    165:   if (its == 1 && ((PetscObject)mfn)->prefix) {
    166:     PetscViewerASCIIPrintf(viewer,"  Error estimates for %s solve.\n",((PetscObject)mfn)->prefix);
    167:   }
    168:   PetscViewerASCIIPrintf(viewer,"%3D MFN Error estimate %14.12e\n",its,(double)errest);
    169:   PetscViewerASCIISubtractTab(viewer,((PetscObject)mfn)->tablevel);
    170:   PetscViewerPopFormat(viewer);
    171:   return(0);
    172: }

    174: /*@C
    175:    MFNMonitorLGCreate - Creates a line graph context for use with
    176:    MFN to monitor convergence.

    178:    Collective

    180:    Input Parameters:
    181: +  comm - communicator context
    182: .  host - the X display to open, or null for the local machine
    183: .  label - the title to put in the title bar
    184: .  x, y - the screen coordinates of the upper left coordinate of
    185:           the window
    186: -  m, n - the screen width and height in pixels

    188:    Output Parameter:
    189: .  lgctx - the drawing context

    191:    Options Database Keys:
    192: .  -mfn_monitor_lg - Sets line graph monitor

    194:    Notes:
    195:    Use PetscDrawLGDestroy() to destroy this line graph.

    197:    Level: intermediate

    199: .seealso: MFNMonitorSet()
    200: @*/
    201: PetscErrorCode MFNMonitorLGCreate(MPI_Comm comm,const char host[],const char label[],int x,int y,int m,int n,PetscDrawLG *lgctx)
    202: {
    203:   PetscDraw      draw;
    204:   PetscDrawLG    lg;

    208:   PetscDrawCreate(comm,host,label,x,y,m,n,&draw);
    209:   PetscDrawSetFromOptions(draw);
    210:   PetscDrawLGCreate(draw,1,&lg);
    211:   PetscDrawLGSetFromOptions(lg);
    212:   PetscDrawDestroy(&draw);
    213:   *lgctx = lg;
    214:   return(0);
    215: }

    217: PetscErrorCode MFNMonitorLG(MFN mfn,PetscInt its,PetscReal errest,void *ctx)
    218: {
    219:   PetscDrawLG    lg = (PetscDrawLG)ctx;
    220:   PetscReal      x,y;

    225:   if (its==1) {
    226:     PetscDrawLGReset(lg);
    227:     PetscDrawLGSetDimension(lg,1);
    228:     PetscDrawLGSetLimits(lg,1,1.0,PetscLog10Real(mfn->tol)-2,0.0);
    229:   }
    230:   x = (PetscReal)its;
    231:   if (errest > 0.0) y = PetscLog10Real(errest);
    232:   else y = 0.0;
    233:   PetscDrawLGAddPoint(lg,&x,&y);
    234:   if (its <= 20 || !(its % 5) || mfn->reason) {
    235:     PetscDrawLGDraw(lg);
    236:     PetscDrawLGSave(lg);
    237:   }
    238:   return(0);
    239: }