Package org.apache.sysds.hops.codegen.opt

Class PlanSelectionFuseCostBasedV2

java.lang.Object

org.apache.sysds.hops.codegen.opt.PlanSelection

org.apache.sysds.hops.codegen.opt.PlanSelectionFuseCostBasedV2

public class PlanSelectionFuseCostBasedV2
extends PlanSelection

This cost-based plan selection algorithm chooses fused operators based on the DAG structure and resulting overall costs. This includes holistic decisions on

• Materialization points per consumer
• Sparsity exploitation and operator ordering
• Decisions on overlapping template types
• Decisions on multi-aggregates with shared reads
• Constraints (e.g., memory budgets and block sizes)

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.sysds.hops.codegen.opt.PlanSelection

PlanSelection.VisitMarkCost

Field Summary

Fields

Modifier and Type	Field	Description
static final double	COST_MIN_EPS
static final int	COST_MIN_EPS_NUM_POINTS
static boolean	COST_PRUNING
static boolean	PLAN_CACHING
static boolean	STRUCTURAL_PRUNING

Constructor Summary

Constructors

Constructor	Description
PlanSelectionFuseCostBasedV2()

Method Summary

Modifier and Type	Method	Description
void	selectPlans(CPlanMemoTable memo, ArrayList<Hop> roots)	Given a HOP DAG G, and a set of partial fusions plans P, find the set of optimal, non-conflicting fusion plans P' that applied to G minimizes costs C with P' = \argmin_{p \subseteq P} C(G, p) s.t.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

COST_MIN_EPS

public static final double COST_MIN_EPS

See Also:

• Constant Field Values

COST_MIN_EPS_NUM_POINTS

public static final int COST_MIN_EPS_NUM_POINTS

See Also:

• Constant Field Values

COST_PRUNING

public static boolean COST_PRUNING

STRUCTURAL_PRUNING

public static boolean STRUCTURAL_PRUNING

PLAN_CACHING

public static boolean PLAN_CACHING

Constructor Details

PlanSelectionFuseCostBasedV2

public PlanSelectionFuseCostBasedV2()

Method Details

selectPlans

public void selectPlans(CPlanMemoTable memo,
 ArrayList<Hop> roots)

Description copied from class: PlanSelection

Given a HOP DAG G, and a set of partial fusions plans P, find the set of optimal, non-conflicting fusion plans P' that applied to G minimizes costs C with P' = \argmin_{p \subseteq P} C(G, p) s.t. Z \vDash p, where Z is a set of constraints such as memory budgets and block size restrictions per fused operator.

Specified by:

selectPlans in class PlanSelection

Parameters:

memo - partial fusion plans P

roots - entry points of HOP DAG G