1: #include <petsc-private/kspimpl.h>  /*I "petscksp.h" I*/
  2: #include <petscviewersaws.h>

  4: typedef struct {
  5:   PetscViewer    viewer;
  6:   PetscInt       neigs;
  7:   PetscReal      *eigi;
  8:   PetscReal      *eigr;
  9: } KSPMonitor_SAWs;

 13: /*@C
 14:    KSPMonitorSAWsCreate - create an SAWs monitor context

 16:    Collective

 18:    Input Arguments:
 19: .  ksp - KSP to monitor

 21:    Output Arguments:
 22: .  ctx - context for monitor

 24:    Level: developer

 26: .seealso: KSPMonitorSAWs(), KSPMonitorSAWsDestroy()
 27: @*/
 28: PetscErrorCode KSPMonitorSAWsCreate(KSP ksp,void **ctx)
 29: {
 30:   PetscErrorCode  ierr;
 31:   KSPMonitor_SAWs *mon;

 34:   PetscNewLog(ksp,&mon);
 35:   mon->viewer = PETSC_VIEWER_SAWS_(PetscObjectComm((PetscObject)ksp));
 36:   if (!mon->viewer) SETERRQ(PetscObjectComm((PetscObject)ksp),PETSC_ERR_PLIB,"Cannot create SAWs default viewer");
 37:   *ctx = (void*)mon;
 38:   return(0);
 39: }

 43: /*@C
 44:    KSPMonitorSAWsDestroy - destroy a monitor context created with KSPMonitorSAWsCreate()

 46:    Collective

 48:    Input Arguments:
 49: .  ctx - monitor context

 51:    Level: developer

 53: .seealso: KSPMonitorSAWsCreate()
 54: @*/
 55: PetscErrorCode KSPMonitorSAWsDestroy(void **ctx)
 56: {
 57:   KSPMonitor_SAWs *mon = (KSPMonitor_SAWs*)*ctx;
 58:   PetscErrorCode  ierr;

 61:   PetscFree2(mon->eigr,mon->eigi);
 62:   PetscFree(*ctx);
 63:   return(0);
 64: }

 68: /*@C
 69:    KSPMonitorSAWs - monitor solution using SAWs

 71:    Logically Collective on KSP

 73:    Input Parameters:
 74: +  ksp   - iterative context
 75: .  n     - iteration number
 76: .  rnorm - 2-norm (preconditioned) residual value (may be estimated).
 77: -  ctx -  PetscViewer of type SAWs

 79:    Level: advanced

 81: .keywords: KSP, CG, monitor, SAWs, singular values

 83: .seealso: KSPMonitorSingularValue(), KSPComputeExtremeSingularValues(), PetscViewerSAWsOpen()
 84: @*/
 85: PetscErrorCode KSPMonitorSAWs(KSP ksp,PetscInt n,PetscReal rnorm,void *ctx)
 86: {
 87:   PetscErrorCode  ierr;
 88:   KSPMonitor_SAWs *mon   = (KSPMonitor_SAWs*)ctx;
 89:   PetscViewer     viewer = mon->viewer;
 90:   PetscReal       emax,emin;
 91:   PetscMPIInt     rank;

 96:   KSPComputeExtremeSingularValues(ksp,&emax,&emin);

 98:   PetscFree2(mon->eigr,mon->eigi);
 99:   PetscMalloc2(n,&mon->eigr,n,&mon->eigi);
100:   if (n) {
101:     KSPComputeEigenvalues(ksp,n,mon->eigr,mon->eigi,&mon->neigs);

103:     MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
104:     if (!rank) {
105:       SAWs_Delete("/PETSc/ksp_monitor_saws/eigr");
106:       SAWs_Delete("/PETSc/ksp_monitor_saws/eigi");

108:       PetscStackCallSAWs(SAWs_Register,("/PETSc/ksp_monitor_saws/rnorm",&ksp->rnorm,1,SAWs_READ,SAWs_DOUBLE));
109:       PetscStackCallSAWs(SAWs_Register,("/PETSc/ksp_monitor_saws/neigs",&mon->neigs,1,SAWs_READ,SAWs_INT));
110:       if (mon->neigs > 0) {
111:         PetscStackCallSAWs(SAWs_Register,("/PETSc/ksp_monitor_saws/eigr",mon->eigr,mon->neigs,SAWs_READ,SAWs_DOUBLE));
112:         PetscStackCallSAWs(SAWs_Register,("/PETSc/ksp_monitor_saws/eigi",mon->eigi,mon->neigs,SAWs_READ,SAWs_DOUBLE));
113:       }
114:       PetscInfo2(ksp,"KSP extreme singular values min=%g max=%g\n",(double)emin,(double)emax);
115:       PetscSAWsBlock();
116:     }
117:   }
118:   return(0);
119: }