ConditionsStallTest.py

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#!/usr/bin/env gaudirun.py
 
'''
A test to demonstrate stalling for a conditions algorithm
 
 - Control flow requires that Alg C run after Alg B
 - Alg B requires conditions data produced by Alg A
 - However, Alg A requires the output from Alg C, and thus the job will stall
 
'''
from Gaudi.Configuration import *
from Configurables import (HiveWhiteBoard, HiveSlimEventLoopMgr,
                           AvalancheSchedulerSvc, AlgResourcePool,
                           Test__ViewTester)
 
# metaconfig -------------------------------------------------------------------
# It's confortable to collect the relevant parameters at the top of the optionfile
evtslots = 1
evtMax = 10
threads = 1
# -------------------------------------------------------------------------------
 
# The configuration of the whiteboard ------------------------------------------
# It is useful to call it EventDataSvc to replace the usual data service with
# the whiteboard transparently.
 
whiteboard = HiveWhiteBoard("EventDataSvc", EventSlots=evtslots)
 
# -------------------------------------------------------------------------------
 
# Event Loop Manager -----------------------------------------------------------
# It's called slim since it has less functionalities overall than the good-old
# event loop manager. Here we just set its outputlevel to DEBUG.
 
slimeventloopmgr = HiveSlimEventLoopMgr(
    SchedulerName="AvalancheSchedulerSvc", OutputLevel=INFO)
 
# -------------------------------------------------------------------------------
 
# ForwardScheduler -------------------------------------------------------------
# We just decide how many algorithms in flight we want to have and how many
# threads in the pool. The default value is -1, which is for TBB equivalent
# to take over the whole machine.
 
scheduler = AvalancheSchedulerSvc(
    ThreadPoolSize=threads,
    OutputLevel=INFO,
    CheckDependencies=True,
    DataLoaderAlg="")
 
# -------------------------------------------------------------------------------
 
# Algo Resource Pool -----------------------------------------------------------
# Nothing special here, we just set the debug level.
AlgResourcePool(OutputLevel=INFO)
 
# -------------------------------------------------------------------------------
 
# Conditions service -----------------------------------------------------------
# This declares algorithms or data to be part of the "conditions realm"
# They are detached from the regular CF graph
from Configurables import Gaudi__Examples__Conditions__CondSvc as CS
condSvc = CS(name="CondSvc", Algs=["AlgA"], Data=["/Event/A1"])
 
# -------------------------------------------------------------------------------
 
# Set up of the crunchers, daily business --------------------------------------
 
a1 = Test__ViewTester("AlgA", OutputLevel=INFO)
a1.outKeys = ['/Event/A1']
a1.inpKeys = ['/Event/A2']
 
a2 = Test__ViewTester("AlgB", OutputLevel=INFO)
a2.inpKeys = ['/Event/A1']
 
a3 = Test__ViewTester("AlgC", OutputLevel=INFO)
a3.outKeys = ['/Event/A2']
 
algSeq = GaudiSequencer(
    "algSeq", Members=[a1, a2, a3], Sequential=True, OutputLevel=INFO)
 
# Application Manager ----------------------------------------------------------
# We put everything together and change the type of message service
 
ApplicationMgr(
    EvtMax=evtMax,
    EvtSel='NONE',
    ExtSvc=[whiteboard, condSvc],
    EventLoop=slimeventloopmgr,
    TopAlg=[algSeq],
    MessageSvcType="InertMessageSvc")
 
# -------------------------------------------------------------------------------