concsolver_scip.c File Reference

Detailed Description

implementation of concurrent solver interface for SCIP

Author

Robert Lion Gottwald

Definition in file concsolver_scip.c.

#include "blockmemshell/memory.h"
#include "scip/boundstore.h"
#include "scip/concsolver.h"
#include "scip/concsolver_scip.h"
#include "scip/concurrent.h"
#include "scip/pub_event.h"
#include "scip/pub_heur.h"
#include "scip/pub_message.h"
#include "scip/pub_misc.h"
#include "scip/pub_paramset.h"
#include "scip/pub_sol.h"
#include "scip/pub_var.h"
#include "scip/scip_concurrent.h"
#include "scip/scip_copy.h"
#include "scip/scip_event.h"
#include "scip/scip_general.h"
#include "scip/scip_heur.h"
#include "scip/scip_mem.h"
#include "scip/scip_message.h"
#include "scip/scip_numerics.h"
#include "scip/scip_param.h"
#include "scip/scip_prob.h"
#include "scip/scip_sol.h"
#include "scip/scip_solve.h"
#include "scip/scip_solvingstats.h"
#include "scip/scip_timing.h"
#include "scip/syncstore.h"
#include <string.h>

Go to the source code of this file.

Macros
#define	EVENTHDLR_NAME   "sync"
#define	EVENTHDLR_DESC   "event handler for synchronization of concurrent scip sovlers"

Functions
static	SCIP_DECL_EVENTFREE (eventFreeSync)
static	SCIP_DECL_EVENTINIT (eventInitSync)
static	SCIP_DECL_EVENTEXIT (eventExitSync)
static	SCIP_DECL_EVENTEXEC (eventExecSync)
static SCIP_RETCODE	includeEventHdlrSync (SCIP *scip)
static SCIP_RETCODE	disableConflictingDualReductions (SCIP *scip)
static SCIP_RETCODE	setChildSelRule (SCIP_CONCSOLVER *concsolver)
static SCIP_RETCODE	initConcsolver (SCIP *scip, SCIP_CONCSOLVER *concsolver)
static	SCIP_DECL_CONCSOLVERCREATEINST (concsolverScipCreateInstance)
static	SCIP_DECL_CONCSOLVERDESTROYINST (concsolverScipDestroyInstance)
static	SCIP_DECL_CONCSOLVERTYPEFREEDATA (concsolverTypeScipFreeData)
static	SCIP_DECL_CONCSOLVERINITSEEDS (concsolverScipInitSeeds)
static	SCIP_DECL_CONCSOLVERCOPYSOLVINGDATA (concsolverGetSolvingData)
static	SCIP_DECL_CONCSOLVEREXEC (concsolverScipExec)
static	SCIP_DECL_CONCSOLVERSTOP (concsolverScipStop)
static	SCIP_DECL_CONCSOLVERSYNCWRITE (concsolverScipSyncWrite)
static	SCIP_DECL_CONCSOLVERSYNCREAD (concsolverScipSyncRead)
SCIP_RETCODE	SCIPincludeConcurrentScipSolvers (SCIP *scip)

Macro Definition Documentation

EVENTHDLR_NAME

#define EVENTHDLR_NAME   "sync"

Definition at line 54 of file concsolver_scip.c.

Referenced by includeEventHdlrSync(), SCIP_DECL_EVENTEXEC(), SCIP_DECL_EVENTEXIT(), SCIP_DECL_EVENTFREE(), and SCIP_DECL_EVENTINIT().

EVENTHDLR_DESC

#define EVENTHDLR_DESC   "event handler for synchronization of concurrent scip sovlers"

Definition at line 55 of file concsolver_scip.c.

Referenced by includeEventHdlrSync().

Function Documentation

SCIP_DECL_EVENTFREE()

static SCIP_DECL_EVENTFREE ( eventFreeSync  )

static

destructor of event handler to free user data (called when SCIP is exiting)

Definition at line 73 of file concsolver_scip.c.

References EVENTHDLR_NAME, NULL, SCIP_OKAY, SCIPeventhdlrGetData(), SCIPeventhdlrGetName(), SCIPeventhdlrSetData(), and SCIPfreeBlockMemory.

SCIP_DECL_EVENTINIT()

static SCIP_DECL_EVENTINIT ( eventInitSync  )

static

initialization method of event handler (called after problem was transformed)

Definition at line 93 of file concsolver_scip.c.

References EVENTHDLR_NAME, NULL, SCIP_CALL, SCIP_EVENTTYPE_SYNC, SCIP_OKAY, SCIPcatchEvent(), SCIPeventhdlrGetData(), SCIPeventhdlrGetName(), SCIPgetSyncstore(), and SCIPsyncstoreIsInitialized().

SCIP_DECL_EVENTEXIT()

static SCIP_DECL_EVENTEXIT ( eventExitSync  )

static

deinitialization method of event handler (called before transformed problem is freed)

Definition at line 119 of file concsolver_scip.c.

References EVENTHDLR_NAME, NULL, SCIP_CALL, SCIP_EVENTTYPE_SYNC, SCIP_OKAY, SCIPdropEvent(), SCIPeventhdlrGetData(), and SCIPeventhdlrGetName().

SCIP_DECL_EVENTEXEC()

static SCIP_DECL_EVENTEXEC ( eventExecSync  )

static

execution method of event handler

Definition at line 142 of file concsolver_scip.c.

References EVENTHDLR_NAME, NULL, SCIP_CALL, SCIP_OKAY, SCIPeventhdlrGetName(), and SCIPsynchronize().

includeEventHdlrSync()

static SCIP_RETCODE includeEventHdlrSync ( SCIP *  scip )

static

includes event handler for synchronization found

Parameters

scip	SCIP data structure

Definition at line 157 of file concsolver_scip.c.

References EVENTHDLR_DESC, EVENTHDLR_NAME, NULL, SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIPallocBlockMemory, SCIPincludeEventhdlrBasic(), SCIPsetEventhdlrExit(), SCIPsetEventhdlrFree(), and SCIPsetEventhdlrInit().

Referenced by SCIP_DECL_CONCSOLVERCREATEINST().

disableConflictingDualReductions()

static SCIP_RETCODE disableConflictingDualReductions ( SCIP *  scip )

static

Disable dual reductions that might cut off optimal solutions. Although they keep at least one optimal solution intact, communicating these bounds may cut off all optimal solutions, if different optimal solutions were kept in different concurrent solvers.

Parameters

scip	SCIP datastructure

Definition at line 197 of file concsolver_scip.c.

References FALSE, SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIPgetBoolParam(), and SCIPsetBoolParam().

Referenced by SCIP_DECL_CONCSOLVERCREATEINST().

setChildSelRule()

static SCIP_RETCODE setChildSelRule ( SCIP_CONCSOLVER *  concsolver )

static

sets the child selection rule based on the index of the concurrent solver

Parameters

concsolver

the concurrent solver

Definition at line 215 of file concsolver_scip.c.

References NULL, SCIP_CALL, SCIP_OKAY, SCIPconcsolverGetData(), SCIPconcsolverGetIdx(), and SCIPsetCharParam().

Referenced by SCIP_DECL_CONCSOLVERCREATEINST().

initConcsolver()

static SCIP_RETCODE initConcsolver ( SCIP *  scip, SCIP_CONCSOLVER *  concsolver  )

static

initialize the concurrent SCIP solver, i.e. setup the copy of the problem and the mapping of the variables

Parameters

scip	the main SCIP instance
concsolver	the concurrent solver to set up

Definition at line 235 of file concsolver_scip.c.

References FALSE, NULL, SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPaddSol(), SCIPallocBlockMemoryArray, SCIPallocBufferArray, SCIPblkmem(), SCIPconcsolverGetData(), SCIPconcsolverGetName(), SCIPcopy(), SCIPcreate(), SCIPcreateConcurrent(), SCIPcreateSol(), SCIPfreeBufferArray, SCIPgetBestSol(), SCIPgetNSols(), SCIPgetNVars(), SCIPgetSolVals(), SCIPgetVars(), SCIPhashmapCreate(), SCIPhashmapFree(), SCIPhashmapGetImage(), SCIPsetSolVals(), SCIPvarGetIndex(), and TRUE.

Referenced by SCIP_DECL_CONCSOLVERCREATEINST().

SCIP_DECL_CONCSOLVERCREATEINST()

static SCIP_DECL_CONCSOLVERCREATEINST ( concsolverScipCreateInstance  )

static

creates an instance of a concurrent SCIP solver

Definition at line 312 of file concsolver_scip.c.

References BMSallocMemory, disableConflictingDualReductions(), FALSE, includeEventHdlrSync(), initConcsolver(), NULL, SCIP_ALLOC, SCIP_Bool, SCIP_CALL, SCIP_CLOCKTYPE_WALL, SCIP_MAXSTRLEN, SCIP_OKAY, SCIP_VERBLEVEL_FULL, SCIPallocBufferArray, SCIPconcsolverGetIdx(), SCIPconcsolverGetName(), SCIPconcsolverSetData(), SCIPconcsolverTypeGetData(), SCIPfileExists(), SCIPfixParam(), SCIPfreeBufferArray, SCIPgetBoolParam(), SCIPgetNParams(), SCIPgetParams(), SCIPgetStringParam(), SCIPinfoMessage(), SCIPparamGetName(), SCIPreadParams(), SCIPsetBoolParam(), SCIPsetEmphasis(), SCIPsetIntParam(), SCIPsnprintf(), SCIPunfixParam(), SCIPverbMessage(), setChildSelRule(), and TRUE.

SCIP_DECL_CONCSOLVERDESTROYINST()

static SCIP_DECL_CONCSOLVERDESTROYINST ( concsolverScipDestroyInstance  )

static

destroys an instance of a concurrent SCIP solver

Definition at line 419 of file concsolver_scip.c.

References BMSfreeMemory, NULL, SCIP_CALL, SCIP_OKAY, SCIPconcsolverGetData(), SCIPconcsolverSetData(), SCIPfree(), and SCIPfreeBlockMemoryArray.

SCIP_DECL_CONCSOLVERTYPEFREEDATA()

static SCIP_DECL_CONCSOLVERTYPEFREEDATA ( concsolverTypeScipFreeData  )

static

frees the data of a concurrent solver type

Definition at line 442 of file concsolver_scip.c.

References BMSfreeMemory.

SCIP_DECL_CONCSOLVERINITSEEDS()

static SCIP_DECL_CONCSOLVERINITSEEDS ( concsolverScipInitSeeds  )

static

initializes the random and permutation seeds with the given one and enables permutation of constraints and variables

Definition at line 451 of file concsolver_scip.c.

References NULL, SCIP_CALL, SCIP_OKAY, SCIPconcsolverGetData(), SCIPconcsolverGetName(), SCIPinfoMessage(), SCIPsetBoolParam(), SCIPsetIntParam(), and TRUE.

SCIP_DECL_CONCSOLVERCOPYSOLVINGDATA()

static SCIP_DECL_CONCSOLVERCOPYSOLVINGDATA ( concsolverGetSolvingData  )

static

installs the solving status of this concurrent solver and the solving statistics into the given SCIP instance

Definition at line 474 of file concsolver_scip.c.

References NULL, SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPaddSolFree(), SCIPallocBufferArray, SCIPconcsolverGetData(), SCIPcopyConcurrentSolvingStats(), SCIPcopySolStats(), SCIPcreateSol(), SCIPfindHeur(), SCIPfreeBufferArray, SCIPgetNSols(), SCIPgetNVars(), SCIPgetSols(), SCIPgetSolVals(), SCIPgetVars(), SCIPheurGetName(), SCIPsetSolVals(), and SCIPsolGetHeur().

SCIP_DECL_CONCSOLVEREXEC()

static SCIP_DECL_CONCSOLVEREXEC ( concsolverScipExec  )

static

start solving the problem until the solving reaches a limit, gets interrupted, or just finished successfully

Definition at line 536 of file concsolver_scip.c.

References nnodes, NULL, SCIP_CALL, SCIP_OKAY, SCIPconcsolverGetData(), SCIPconcsolverGetName(), SCIPgetNLPIterations(), SCIPgetNNodes(), SCIPgetSolvingTime(), SCIPinfoMessage(), SCIPprintStatus(), and SCIPsolve().

SCIP_DECL_CONCSOLVERSTOP()

static SCIP_DECL_CONCSOLVERSTOP ( concsolverScipStop  )

static

stops the concurrent solver as soon as possible

Definition at line 566 of file concsolver_scip.c.

References NULL, SCIP_CALL, SCIP_OKAY, SCIPconcsolverGetData(), and SCIPinterruptSolve().

SCIP_DECL_CONCSOLVERSYNCWRITE()

static SCIP_DECL_CONCSOLVERSYNCWRITE ( concsolverScipSyncWrite  )

static

writes new solutions and global boundchanges to the iven synchronization data

Definition at line 581 of file concsolver_scip.c.

References MIN, NULL, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIP_STATUS_UNKNOWN, SCIPconcsolverGetData(), SCIPconcsolverGetIdx(), SCIPconcsolverGetName(), SCIPdebugMessage, SCIPgetConcurrentGlobalBoundChanges(), SCIPgetDualbound(), SCIPgetMemTotal(), SCIPgetNSols(), SCIPgetPrimalbound(), SCIPgetSolOrigObj(), SCIPgetSols(), SCIPgetSolVals(), SCIPgetStatus(), SCIPIsConcurrentSolNew(), SCIPsyncdataAddBoundChanges(), SCIPsyncdataAddMemTotal(), SCIPsyncdataGetSolutionBuffer(), SCIPsyncdataGetStatus(), SCIPsyncdataSetLowerbound(), SCIPsyncdataSetStatus(), and SCIPsyncdataSetUpperbound().

SCIP_DECL_CONCSOLVERSYNCREAD()

static SCIP_DECL_CONCSOLVERSYNCREAD ( concsolverScipSyncRead  )

static

reads the solutions and bounds from the given synchronization data

Definition at line 654 of file concsolver_scip.c.

References NULL, SCIP_BOUNDTYPE_LOWER, SCIP_BOUNDTYPE_UPPER, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIP_VARSTATUS_MULTAGGR, SCIP_VARTYPE_INTEGER, SCIPaddConcurrentBndchg(), SCIPaddConcurrentSol(), SCIPboundstoreGetChgType(), SCIPboundstoreGetChgVal(), SCIPboundstoreGetChgVaridx(), SCIPboundstoreGetNChgs(), SCIPconcsolverGetData(), SCIPconcsolverGetIdx(), SCIPconcsolverGetName(), SCIPcreateOrigSol(), SCIPdebugMessage, SCIPisGE(), SCIPisLE(), SCIPsetSolVals(), SCIPsyncdataGetBoundChgs(), SCIPsyncdataGetSolutions(), SCIPvarGetLbGlobal(), SCIPvarGetProbvarBound(), SCIPvarGetStatus(), SCIPvarGetType(), and SCIPvarGetUbGlobal().

SCIPincludeConcurrentScipSolvers()

SCIP_RETCODE SCIPincludeConcurrentScipSolvers

(

SCIP *

scip

)

creates the concurrent SCIP solver plugins and includes them in SCIP

Parameters

scip	SCIP datastructure

Definition at line 740 of file concsolver_scip.c.

References FALSE, NULL, SCIP_CALL, SCIP_OKAY, SCIP_PARAMEMPHASIS_COUNTER, SCIP_PARAMEMPHASIS_CPSOLVER, SCIP_PARAMEMPHASIS_DEFAULT, SCIP_PARAMEMPHASIS_EASYCIP, SCIP_PARAMEMPHASIS_FEASIBILITY, SCIP_PARAMEMPHASIS_HARDLP, SCIP_PARAMEMPHASIS_OPTIMALITY, SCIPallocMemory, SCIPincludeConcsolverType(), and TRUE.

Referenced by SCIPincludeDefaultPlugins().