PETSc version 3.15.4

KSPBCGSLSetXRes

Sets the parameter governing when exact residuals will be used instead of computed residuals.

#include "petscksp.h" 
PetscErrorCode  KSPBCGSLSetXRes(KSP ksp, PetscReal delta)

Logically Collective on ksp

	ksp	- iterative context obtained from KSPCreate
	delta	- computed residuals are used alone when delta is not positive

-ksp_bcgsl_xres delta

intermediate