PCASMType#

Type of additive Schwarz method to use

Synopsis#

typedef enum {
  PC_ASM_BASIC       = 3,
  PC_ASM_RESTRICT    = 1,
  PC_ASM_INTERPOLATE = 2,
  PC_ASM_NONE        = 0
} PCASMType;

PC_ASM_BASIC - Symmetric version where residuals from the ghost points are used and computed values in ghost regions are added together. Classical standard additive Schwarz as introduced in [DW87].
PC_ASM_RESTRICT - Residuals from ghost points are used but computed values in ghost region are discarded [CS99]. Default.
PC_ASM_INTERPOLATE - Residuals from ghost points are not used, computed values in ghost region are added back in.
PC_ASM_NONE - Residuals from ghost points are not used, computed ghost values are discarded. Not very good.

CS99: X.-C. Cai and M. Sarkis. A restricted additive Schwarz preconditioner for general sparse linear systems. SIAM J. Scientific Computing, 21:792–797, 1999.
DW87: Maksymilian Dryja and Olof Widlund. An additive variant of the Schwarz alternating method for the case of many subregions. Ultracomputer Research Laboratory, Univ., Courant Inst. of Mathematical …, 1987.

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