question: public static void optimize ( POptMode type , ParForStatementBlock sb , ParForProgramBlock pb , ExecutionContext ec , boolean monitor ) throws DMLRuntimeException { Timing time = new Timing ( true ) ; LOG . debug ( "ParFOR Opt: Running optimization for ParFOR(" + pb . getID ( ) + ")" ) ; int ck = UtilFunctions . toInt ( Math . max ( InfrastructureAnalyzer . getCkMaxCP ( ) , InfrastructureAnalyzer . getCkMaxMR ( ) ) * PAR_FACTOR_INFRASTRUCTURE ) ; double cm = InfrastructureAnalyzer . getCmMax ( ) * OptimizerUtils . MEM_UTIL_FACTOR ; optimize ( type , ck , cm , sb , pb , ec , monitor ) ; double timeVal = time . stop ( ) ; LOG . debug ( "ParFOR Opt: Finished optimization for PARFOR(" + pb . getID ( ) + ") in " + timeVal + "ms." ) ; if ( monitor ) StatisticMonitor . putPFStat ( pb . getID ( ) , Stat . OPT_T , timeVal ) ; }
target:  Called once per top-level parfor (during runtime, on parfor execute) in order to optimize the specific parfor program block. NOTE: this is the default way to invoke parfor optimizers.