concsolver_scip.c File Reference

Detailed Description

implementation of concurrent solver interface for SCIP

Author

Leona Gottwald

Marc Pfetsch

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_disp.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 solvers"

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 68 of file concsolver_scip.c.

EVENTHDLR_DESC

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

Definition at line 69 of file concsolver_scip.c.

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 87 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 107 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 133 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 156 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 171 of file concsolver_scip.c.

References EVENTHDLR_DESC, EVENTHDLR_NAME, NULL, 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 data structure

Definition at line 211 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 229 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 249 of file concsolver_scip.c.

References FALSE, NULL, SCIP_Bool, SCIP_CALL, SCIP_OKAY, SCIP_Real, SCIPaddSolFree(), SCIPallocBlockMemoryArray, SCIPallocBufferArray, SCIPallocClearBufferArray, SCIPblkmem(), SCIPconcsolverGetData(), SCIPconcsolverGetName(), SCIPcopyConsCompression(), SCIPcreate(), SCIPcreateConcurrent(), SCIPcreateSol(), SCIPdebugMessage, SCIPfreeBufferArray, SCIPgetBestSol(), SCIPgetFixedVars(), SCIPgetMessagehdlr(), SCIPgetNFixedVars(), SCIPgetNOrigVars(), SCIPgetNSols(), SCIPgetNVars(), SCIPgetSolVal(), SCIPgetVars(), SCIPhashmapCreate(), SCIPhashmapFree(), SCIPhashmapGetImage(), SCIPmessagehdlrIsQuiet(), SCIPsetBoolParam(), SCIPsetMessagehdlrQuiet(), SCIPsetSolVal(), SCIPvarGetProbindex(), 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 393 of file concsolver_scip.c.

References BMSallocMemory, disableConflictingDualReductions(), FALSE, includeEventHdlrSync(), initConcsolver(), NULL, paramname, 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 500 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 523 of file concsolver_scip.c.

References BMSfreeMemory, and NULL.

SCIP_DECL_CONCSOLVERINITSEEDS()

static SCIP_DECL_CONCSOLVERINITSEEDS ( concsolverScipInitSeeds  )

static

initializes the random and permutation seeds and enables permutation of constraints and variables

Definition at line 531 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

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

Definition at line 554 of file concsolver_scip.c.

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

SCIP_DECL_CONCSOLVEREXEC()

static SCIP_DECL_CONCSOLVEREXEC ( concsolverScipExec  )

static

execution method of SCIP concsolver solver

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

Definition at line 630 of file concsolver_scip.c.

References nnodes, NULL, SCIP_CALL, SCIP_OKAY, SCIPconcsolverGetData(), SCIPconcsolverGetName(), SCIPdispTime(), SCIPgetMessagehdlr(), 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 666 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 given synchronization data

Definition at line 682 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 763 of file concsolver_scip.c.

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

SCIPincludeConcurrentScipSolvers()

SCIP_RETCODE SCIPincludeConcurrentScipSolvers

(

SCIP *

scip

)

creates the concurrent SCIP solver plugins and includes them in SCIP

Parameters

scip	SCIP data structure

Definition at line 860 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().