nodesel.h File Reference

Detailed Description

internal methods for node selectors and node priority queues

Author

Tobias Achterberg

Definition in file nodesel.h.

#include "scip/def.h"
#include "blockmemshell/memory.h"
#include "scip/type_retcode.h"
#include "scip/type_set.h"
#include "scip/type_stat.h"
#include "scip/type_lp.h"
#include "scip/type_tree.h"
#include "scip/pub_nodesel.h"

Go to the source code of this file.

Functions
SCIP_RETCODE	SCIPnodepqCreate (SCIP_NODEPQ **nodepq, SCIP_SET *set, SCIP_NODESEL *nodesel)
void	SCIPnodepqDestroy (SCIP_NODEPQ **nodepq)
SCIP_RETCODE	SCIPnodepqFree (SCIP_NODEPQ **nodepq, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_STAT *stat, SCIP_EVENTQUEUE *eventqueue, SCIP_TREE *tree, SCIP_LP *lp)
SCIP_RETCODE	SCIPnodepqClear (SCIP_NODEPQ *nodepq, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_STAT *stat, SCIP_EVENTQUEUE *eventqueue, SCIP_TREE *tree, SCIP_LP *lp)
SCIP_NODESEL *	SCIPnodepqGetNodesel (SCIP_NODEPQ *nodepq)
SCIP_RETCODE	SCIPnodepqSetNodesel (SCIP_NODEPQ **nodepq, SCIP_SET *set, SCIP_NODESEL *nodesel)
int	SCIPnodepqCompare (SCIP_NODEPQ *nodepq, SCIP_SET *set, SCIP_NODE *node1, SCIP_NODE *node2)
SCIP_RETCODE	SCIPnodepqInsert (SCIP_NODEPQ *nodepq, SCIP_SET *set, SCIP_NODE *node)
SCIP_RETCODE	SCIPnodepqRemove (SCIP_NODEPQ *nodepq, SCIP_SET *set, SCIP_NODE *node)
SCIP_NODE *	SCIPnodepqFirst (const SCIP_NODEPQ *nodepq)
SCIP_NODE **	SCIPnodepqNodes (const SCIP_NODEPQ *nodepq)
int	SCIPnodepqLen (const SCIP_NODEPQ *nodepq)
SCIP_Real	SCIPnodepqGetLowerbound (SCIP_NODEPQ *nodepq, SCIP_SET *set)
SCIP_NODE *	SCIPnodepqGetLowerboundNode (SCIP_NODEPQ *nodepq, SCIP_SET *set)
SCIP_Real	SCIPnodepqGetLowerboundSum (SCIP_NODEPQ *nodepq)
SCIP_RETCODE	SCIPnodepqBound (SCIP_NODEPQ *nodepq, BMS_BLKMEM *blkmem, SCIP_SET *set, SCIP_STAT *stat, SCIP_EVENTQUEUE *eventqueue, SCIP_TREE *tree, SCIP_LP *lp, SCIP_Real cutoffbound)
SCIP_RETCODE	SCIPnodeselCopyInclude (SCIP_NODESEL *nodesel, SCIP_SET *set)
SCIP_RETCODE	SCIPnodeselCreate (SCIP_NODESEL **nodesel, SCIP_SET *set, SCIP_MESSAGEHDLR *messagehdlr, BMS_BLKMEM *blkmem, const char *name, const char *desc, int stdpriority, int memsavepriority, SCIP_DECL_NODESELCOPY((*nodeselcopy)), SCIP_DECL_NODESELFREE((*nodeselfree)), SCIP_DECL_NODESELINIT((*nodeselinit)), SCIP_DECL_NODESELEXIT((*nodeselexit)), SCIP_DECL_NODESELINITSOL((*nodeselinitsol)), SCIP_DECL_NODESELEXITSOL((*nodeselexitsol)), SCIP_DECL_NODESELSELECT((*nodeselselect)), SCIP_DECL_NODESELCOMP((*nodeselcomp)), SCIP_NODESELDATA *nodeseldata)
SCIP_RETCODE	SCIPnodeselFree (SCIP_NODESEL **nodesel, SCIP_SET *set)
SCIP_RETCODE	SCIPnodeselInit (SCIP_NODESEL *nodesel, SCIP_SET *set)
SCIP_RETCODE	SCIPnodeselExit (SCIP_NODESEL *nodesel, SCIP_SET *set)
SCIP_RETCODE	SCIPnodeselInitsol (SCIP_NODESEL *nodesel, SCIP_SET *set)
SCIP_RETCODE	SCIPnodeselExitsol (SCIP_NODESEL *nodesel, SCIP_SET *set)
SCIP_RETCODE	SCIPnodeselSelect (SCIP_NODESEL *nodesel, SCIP_SET *set, SCIP_NODE **selnode)
int	SCIPnodeselCompare (SCIP_NODESEL *nodesel, SCIP_SET *set, SCIP_NODE *node1, SCIP_NODE *node2)
void	SCIPnodeselSetStdPriority (SCIP_NODESEL *nodesel, SCIP_SET *set, int priority)
void	SCIPnodeselSetMemsavePriority (SCIP_NODESEL *nodesel, SCIP_SET *set, int priority)
void	SCIPnodeselSetCopy (SCIP_NODESEL *nodesel, SCIP_DECL_NODESELCOPY((*nodeselcopy)))
void	SCIPnodeselSetFree (SCIP_NODESEL *nodesel, SCIP_DECL_NODESELFREE((*nodeselfree)))
void	SCIPnodeselSetInit (SCIP_NODESEL *nodesel, SCIP_DECL_NODESELINIT((*nodeselinit)))
void	SCIPnodeselSetExit (SCIP_NODESEL *nodesel, SCIP_DECL_NODESELEXIT((*nodeselexit)))
void	SCIPnodeselSetInitsol (SCIP_NODESEL *nodesel, SCIP_DECL_NODESELINITSOL((*nodeselinitsol)))
void	SCIPnodeselSetExitsol (SCIP_NODESEL *nodesel, SCIP_DECL_NODESELEXITSOL((*nodeselexitsol)))

Function Documentation

SCIP_RETCODE SCIPnodepqCreate	(	SCIP_NODEPQ **	nodepq,
		SCIP_SET *	set,
		SCIP_NODESEL *	nodesel
	)

creates node priority queue

Parameters

nodepq	pointer to a node priority queue
set	global SCIP settings
nodesel	node selector to use for sorting the nodes in the queue

Definition at line 94 of file nodesel.c.

References BMSallocMemory, NULL, SCIP_ALLOC, and SCIP_OKAY.

Referenced by SCIPnodepqSetNodesel(), and SCIPtreeCreate().

void SCIPnodepqDestroy

(

SCIP_NODEPQ **

nodepq

)

frees node priority queue, but not the data nodes themselves

Parameters

nodepq

pointer to a node priority queue

Definition at line 115 of file nodesel.c.

References BMSfreeMemory, BMSfreeMemoryArrayNull, and NULL.

Referenced by SCIPnodepqFree(), and SCIPnodepqSetNodesel().

SCIP_RETCODE SCIPnodepqFree	(	SCIP_NODEPQ **	nodepq,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_STAT *	stat,
		SCIP_EVENTQUEUE *	eventqueue,
		SCIP_TREE *	tree,
		SCIP_LP *	lp
	)

frees node priority queue and all nodes in the queue

Parameters

nodepq	pointer to a node priority queue
blkmem	block memory buffers
set	global SCIP settings
stat	problem statistics
eventqueue	event queue
tree	branch and bound tree
lp	current LP data

Definition at line 129 of file nodesel.c.

References NULL, SCIP_CALL, SCIP_OKAY, SCIPnodepqClear(), and SCIPnodepqDestroy().

Referenced by SCIPtreeFree().

SCIP_RETCODE SCIPnodepqClear	(	SCIP_NODEPQ *	nodepq,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_STAT *	stat,
		SCIP_EVENTQUEUE *	eventqueue,
		SCIP_TREE *	tree,
		SCIP_LP *	lp
	)

deletes all nodes in the node priority queue

Parameters

nodepq	node priority queue
blkmem	block memory buffers
set	global SCIP settings
stat	problem statistics
eventqueue	event queue
tree	branch and bound tree
lp	current LP data

Definition at line 152 of file nodesel.c.

References SCIP_NodePQ::len, SCIP_NodePQ::lowerboundsum, NULL, SCIP_CALL, SCIP_NODETYPE_LEAF, SCIP_OKAY, SCIPnodeFree(), SCIPnodeGetType(), SCIPsortDownPtr(), and SCIP_NodePQ::slots.

Referenced by SCIPnodepqFree(), and SCIPtreeClear().

SCIP_NODESEL* SCIPnodepqGetNodesel

(

SCIP_NODEPQ *

nodepq

)

returns the node selector associated with the given node priority queue

Parameters

nodepq

node priority queue

Definition at line 192 of file nodesel.c.

References SCIP_NodePQ::nodesel, and NULL.

Referenced by SCIPtreeGetBestChild(), SCIPtreeGetBestNode(), SCIPtreeGetBestSibling(), SCIPtreeGetNodesel(), and SCIPtreeSetNodesel().

SCIP_RETCODE SCIPnodepqSetNodesel	(	SCIP_NODEPQ **	nodepq,
		SCIP_SET *	set,
		SCIP_NODESEL *	nodesel
	)

sets the node selector used for sorting the nodes in the queue, and resorts the queue if necessary

Parameters

nodepq	pointer to a node priority queue
set	global SCIP settings
nodesel	node selector to use for sorting the nodes in the queue

Definition at line 202 of file nodesel.c.

References SCIP_NodePQ::len, nodepqResize(), NULL, SCIP_CALL, SCIP_OKAY, SCIPnodepqCreate(), SCIPnodepqDestroy(), SCIPnodepqInsert(), and SCIP_NodePQ::slots.

Referenced by SCIPtreeSetNodesel().

int SCIPnodepqCompare	(	SCIP_NODEPQ *	nodepq,
		SCIP_SET *	set,
		SCIP_NODE *	node1,
		SCIP_NODE *	node2
	)

compares two nodes; returns -1/0/+1 if node1 better/equal/worse than node2

Parameters

nodepq	node priority queue
set	global SCIP settings
node1	first node to compare
node2	second node to compare

Definition at line 242 of file nodesel.c.

References SCIP_NodePQ::nodesel, NULL, and SCIPnodeselCompare().

Referenced by SCIPnodeFocus().

SCIP_RETCODE SCIPnodepqInsert	(	SCIP_NODEPQ *	nodepq,
		SCIP_SET *	set,
		SCIP_NODE *	node
	)

inserts node into node priority queue

Parameters

nodepq	node priority queue
set	global SCIP settings
node	node to be inserted

Definition at line 258 of file nodesel.c.

References SCIP_NodePQ::bfsposs, SCIP_NodePQ::bfsqueue, SCIP_NodePQ::len, SCIP_NodePQ::lowerboundsum, nodepqResize(), SCIP_NodePQ::nodesel, NULL, PQ_PARENT, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPdebugMessage, SCIPnodeGetLowerbound(), and SCIP_NodePQ::slots.

Referenced by nodeToLeaf(), and SCIPnodepqSetNodesel().

SCIP_RETCODE SCIPnodepqRemove	(	SCIP_NODEPQ *	nodepq,
		SCIP_SET *	set,
		SCIP_NODE *	node
	)

removes node from the node priority queue

Parameters

nodepq	node priority queue
set	global SCIP settings
node	node to remove

Definition at line 502 of file nodesel.c.

References nodepqDelPos(), nodepqFindNode(), SCIP_INVALIDDATA, SCIP_OKAY, and SCIPerrorMessage.

Referenced by SCIPnodeFocus().

SCIP_NODE* SCIPnodepqFirst

(

const SCIP_NODEPQ *

nodepq

)

returns the best node of the queue without removing it

Parameters

nodepq

node priority queue

Definition at line 523 of file nodesel.c.

References SCIP_NodePQ::len, NULL, and SCIP_NodePQ::slots.

Referenced by SCIPtreeGetBestLeaf().

SCIP_NODE** SCIPnodepqNodes

(

const SCIP_NODEPQ *

nodepq

)

returns the nodes array of the queue

Parameters

nodepq

node priority queue

Definition at line 539 of file nodesel.c.

References NULL, and SCIP_NodePQ::slots.

Referenced by SCIPgetLeaves(), and SCIPgetOpenNodesData().

int SCIPnodepqLen

(

const SCIP_NODEPQ *

nodepq

)

returns the number of nodes stored in the node priority queue

Parameters

nodepq

node priority queue

Definition at line 549 of file nodesel.c.

References SCIP_NodePQ::len, and NULL.

Referenced by SCIPgetLeaves(), SCIPgetNLeaves(), SCIPgetOpenNodesData(), and SCIPtreeGetNLeaves().

SCIP_Real SCIPnodepqGetLowerbound	(	SCIP_NODEPQ *	nodepq,
		SCIP_SET *	set
	)

gets the minimal lower bound of all nodes in the queue

Parameters

nodepq	node priority queue
set	global SCIP settings

Definition at line 560 of file nodesel.c.

References SCIP_NodePQ::bfsqueue, SCIP_NodePQ::len, SCIP_NodePQ::nodesel, NULL, SCIPnodeGetLowerbound(), SCIPsetInfinity(), and SCIP_NodePQ::slots.

Referenced by SCIPtreeGetLowerbound().

SCIP_NODE* SCIPnodepqGetLowerboundNode	(	SCIP_NODEPQ *	nodepq,
		SCIP_SET *	set
	)

gets the node with minimal lower bound of all nodes in the queue

Parameters

nodepq	node priority queue
set	global SCIP settings

Definition at line 583 of file nodesel.c.

References SCIP_NodePQ::bfsqueue, SCIP_NodePQ::len, SCIP_NodePQ::nodesel, NULL, and SCIP_NodePQ::slots.

Referenced by SCIPtreeGetLowerboundNode().

SCIP_Real SCIPnodepqGetLowerboundSum

(

SCIP_NODEPQ *

nodepq

)

gets the sum of lower bounds of all nodes in the queue

Parameters

nodepq

node priority queue

Definition at line 607 of file nodesel.c.

References SCIP_NodePQ::lowerboundsum, and NULL.

Referenced by SCIPtreeGetAvgLowerbound().

SCIP_RETCODE SCIPnodepqBound	(	SCIP_NODEPQ *	nodepq,
		BMS_BLKMEM *	blkmem,
		SCIP_SET *	set,
		SCIP_STAT *	stat,
		SCIP_EVENTQUEUE *	eventqueue,
		SCIP_TREE *	tree,
		SCIP_LP *	lp,
		SCIP_Real	cutoffbound
	)

free all nodes from the queue that are cut off by the given upper bound

Parameters

nodepq	node priority queue
blkmem	block memory buffer
set	global SCIP settings
stat	dynamic problem statistics
eventqueue	event queue
tree	branch and bound tree
lp	current LP data
cutoffbound	cutoff bound: all nodes with lowerbound >= cutoffbound are cut off

Definition at line 617 of file nodesel.c.

References SCIP_NodePQ::len, nodepqDelPos(), NULL, PQ_LEFTCHILD, PQ_RIGHTCHILD, SCIP_Bool, SCIP_CALL, SCIP_NODETYPE_LEAF, SCIP_OKAY, SCIPdebugMessage, SCIPnodeFree(), SCIPnodeGetDepth(), SCIPnodeGetLowerbound(), SCIPnodeGetType(), SCIPsetIsGE(), SCIPsetIsLT(), SCIPvbcCutoffNode(), SCIP_NodePQ::slots, and SCIP_Stat::vbc.

Referenced by SCIPtreeCutoff().

SCIP_RETCODE SCIPnodeselCopyInclude	(	SCIP_NODESEL *	nodesel,
		SCIP_SET *	set
	)

copies the given node selector to a new scip

Parameters

nodesel	node selector
set	SCIP_SET of SCIP to copy to

Definition at line 717 of file nodesel.c.

References NULL, SCIP_CALL, SCIP_OKAY, SCIPdebugMessage, and SCIPnodeselGetName().

Referenced by SCIPsetCopyPlugins().

SCIP_RETCODE SCIPnodeselCreate	(	SCIP_NODESEL **	nodesel,
		SCIP_SET *	set,
		SCIP_MESSAGEHDLR *	messagehdlr,
		BMS_BLKMEM *	blkmem,
		const char *	name,
		const char *	desc,
		int	stdpriority,
		int	memsavepriority,
		SCIP_DECL_NODESELCOPY((*nodeselcopy))	,
		SCIP_DECL_NODESELFREE((*nodeselfree))	,
		SCIP_DECL_NODESELINIT((*nodeselinit))	,
		SCIP_DECL_NODESELEXIT((*nodeselexit))	,
		SCIP_DECL_NODESELINITSOL((*nodeselinitsol))	,
		SCIP_DECL_NODESELEXITSOL((*nodeselexitsol))	,
		SCIP_DECL_NODESELSELECT((*nodeselselect))	,
		SCIP_DECL_NODESELCOMP((*nodeselcomp))	,
		SCIP_NODESELDATA *	nodeseldata
	)

creates a node selector

Parameters

nodesel	pointer to store node selector
set	global SCIP settings
messagehdlr	message handler
blkmem	block memory for parameter settings
name	name of node selector
desc	description of node selector
stdpriority	priority of the node selector in standard mode
memsavepriority	priority of the node selector in memory saving mode
nodeseldata	node selector data

Definition at line 735 of file nodesel.c.

References BMSallocMemory, BMSduplicateMemoryArray, FALSE, NULL, paramname, SCIP_ALLOC, SCIP_CALL, SCIP_CLOCKTYPE_DEFAULT, SCIP_MAXSTRLEN, SCIP_OKAY, SCIPclockCreate(), SCIPsetAddIntParam(), SCIPsnprintf(), and TRUE.

Referenced by SCIPincludeNodesel(), and SCIPincludeNodeselBasic().

SCIP_RETCODE SCIPnodeselFree	(	SCIP_NODESEL **	nodesel,
		SCIP_SET *	set
	)

frees memory of node selector

Parameters

nodesel	pointer to node selector data structure
set	global SCIP settings

Definition at line 800 of file nodesel.c.

References BMSfreeMemory, BMSfreeMemoryArray, NULL, SCIP_CALL, SCIP_OKAY, and SCIPclockFree().

Referenced by SCIPsetFree().

SCIP_RETCODE SCIPnodeselInit	(	SCIP_NODESEL *	nodesel,
		SCIP_SET *	set
	)

initializes node selector

Parameters

nodesel	node selector
set	global SCIP settings

Definition at line 828 of file nodesel.c.

References SCIP_Nodesel::initialized, SCIP_Nodesel::name, SCIP_Nodesel::nodeseltime, NULL, SCIP_CALL, SCIP_INVALIDCALL, SCIP_OKAY, SCIPclockReset(), SCIPclockStart(), SCIPclockStop(), SCIPerrorMessage, SCIP_Nodesel::setuptime, and TRUE.

Referenced by SCIPsetInitPlugins().

SCIP_RETCODE SCIPnodeselExit	(	SCIP_NODESEL *	nodesel,
		SCIP_SET *	set
	)

deinitializes node selector

Parameters

nodesel	node selector
set	global SCIP settings

Definition at line 864 of file nodesel.c.

References FALSE, SCIP_Nodesel::initialized, SCIP_Nodesel::name, NULL, SCIP_CALL, SCIP_INVALIDCALL, SCIP_OKAY, SCIPclockStart(), SCIPclockStop(), SCIPerrorMessage, and SCIP_Nodesel::setuptime.

Referenced by SCIPsetExitPlugins().

SCIP_RETCODE SCIPnodeselInitsol	(	SCIP_NODESEL *	nodesel,
		SCIP_SET *	set
	)

informs node selector that the branch and bound process is being started

Parameters

nodesel	node selector
set	global SCIP settings

Definition at line 894 of file nodesel.c.

References NULL, SCIP_CALL, SCIP_OKAY, SCIPclockStart(), SCIPclockStop(), and SCIP_Nodesel::setuptime.

Referenced by SCIPsetInitsolPlugins().

SCIP_RETCODE SCIPnodeselExitsol	(	SCIP_NODESEL *	nodesel,
		SCIP_SET *	set
	)

informs node selector that the branch and bound process data is being freed

Parameters

nodesel	node selector
set	global SCIP settings

Definition at line 918 of file nodesel.c.

References NULL, SCIP_CALL, SCIP_OKAY, SCIPclockStart(), SCIPclockStop(), and SCIP_Nodesel::setuptime.

Referenced by SCIPsetExitsolPlugins().

SCIP_RETCODE SCIPnodeselSelect	(	SCIP_NODESEL *	nodesel,
		SCIP_SET *	set,
		SCIP_NODE **	selnode
	)

select next node to be processed

Parameters

nodesel	node selector
set	global SCIP settings
selnode	pointer to store node to be processed next

Definition at line 942 of file nodesel.c.

References SCIP_Nodesel::nodeseltime, NULL, SCIP_CALL, SCIP_OKAY, SCIPclockStart(), and SCIPclockStop().

Referenced by SCIPsolveCIP().

int SCIPnodeselCompare	(	SCIP_NODESEL *	nodesel,
		SCIP_SET *	set,
		SCIP_NODE *	node1,
		SCIP_NODE *	node2
	)

compares two nodes; returns -1/0/+1 if node1 better/equal/worse than node2

Parameters

nodesel	node selector
set	global SCIP settings
node1	first node to compare
node2	second node to compare

Definition at line 965 of file nodesel.c.

References NULL.

Referenced by SCIPnodepqCompare(), SCIPtreeGetBestChild(), SCIPtreeGetBestNode(), and SCIPtreeGetBestSibling().

void SCIPnodeselSetStdPriority	(	SCIP_NODESEL *	nodesel,
		SCIP_SET *	set,
		int	priority
	)

sets priority of node selector in standard mode

gets priority of node selector in standard mode

Parameters

nodesel	node selector
set	global SCIP settings
priority	new priority of the node selector

Definition at line 1012 of file nodesel.c.

References NULL, and SCIP_Nodesel::stdpriority.

Referenced by SCIPsetNodeselStdPriority().

void SCIPnodeselSetMemsavePriority	(	SCIP_NODESEL *	nodesel,
		SCIP_SET *	set,
		int	priority
	)

sets priority of node selector in memory saving mode

Parameters

nodesel	node selector
set	global SCIP settings
priority	new priority of the node selector

Definition at line 1036 of file nodesel.c.

References SCIP_Nodesel::memsavepriority, and NULL.

Referenced by SCIPsetNodeselMemsavePriority().

void SCIPnodeselSetCopy	(	SCIP_NODESEL *	nodesel,
		SCIP_DECL_NODESELCOPY((*nodeselcopy))
	)

sets copy method of node selector

Parameters

nodesel

node selector

Definition at line 1073 of file nodesel.c.

References NULL.

Referenced by SCIPsetNodeselCopy().

void SCIPnodeselSetFree	(	SCIP_NODESEL *	nodesel,
		SCIP_DECL_NODESELFREE((*nodeselfree))
	)

sets destructor method of node selector

Parameters

nodesel

node selector

Definition at line 1084 of file nodesel.c.

References NULL.

Referenced by SCIPsetNodeselFree().

void SCIPnodeselSetInit	(	SCIP_NODESEL *	nodesel,
		SCIP_DECL_NODESELINIT((*nodeselinit))
	)

sets initialization method of node selector

Parameters

nodesel

node selector

Definition at line 1095 of file nodesel.c.

References NULL.

Referenced by SCIPsetNodeselInit().

void SCIPnodeselSetExit	(	SCIP_NODESEL *	nodesel,
		SCIP_DECL_NODESELEXIT((*nodeselexit))
	)

sets deinitialization method of node selector

Parameters

nodesel

node selector

Definition at line 1106 of file nodesel.c.

References NULL.

Referenced by SCIPsetNodeselExit().

void SCIPnodeselSetInitsol	(	SCIP_NODESEL *	nodesel,
		SCIP_DECL_NODESELINITSOL((*nodeselinitsol))
	)

sets solving process initialization method of node selector

Parameters

nodesel

node selector

Definition at line 1117 of file nodesel.c.

References NULL.

Referenced by SCIPsetNodeselInitsol().

void SCIPnodeselSetExitsol	(	SCIP_NODESEL *	nodesel,
		SCIP_DECL_NODESELEXITSOL((*nodeselexitsol))
	)

sets solving process deinitialization method of node selector

Parameters

nodesel

node selector

Definition at line 1128 of file nodesel.c.

References NULL.

Referenced by SCIPsetNodeselExitsol().