PETSc version 3.17.0
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# KSPGMRESSetBreakdownTolerance

Sets tolerance for determining divergence breakdown in GMRES.

### Synopsis

    #include "petscksp.h"
    PetscErrorCode  KSPGMRESSetBreakdownTolerance(KSP ksp,PetscReal tol)

Logically Collective on ksp

### Input Parameters

| ksp | - the Krylov space context
| tol | - the tolerance

### Options Database

| -ksp_gmres_breakdown_tolerance <positive real value> | - set tolerance for determining divergence breakdown

Note: divergence breakdown occurs when GMRES residual increases significantly during restart

### See Also

KSPSetTolerances(), KSPGMRESSetHapTol()

### Level

intermediate

### Location

src/ksp/ksp/impls/gmres/gmres.c

### Implementations

KSPGMRESSetBreakdownTolerance_GMRES in src/ksp/ksp/impls/gmres/gmres.c
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