detectSimpleStall.py

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#!/usr/bin/env gaudirun.py
"""
The options file models an intra-event stall in algorithm scheduling.
An early exit from a group of algorithms called 'EarlyExitBranch' is performed due to
an inverted CF decision sot that A2 is not run. This results in an unmet DF dependency
for a downstream algorithm A3, leading to the stall.
"""

from Gaudi.Configuration import *
from Configurables import (HiveWhiteBoard, HiveSlimEventLoopMgr, CPUCrunchSvc,
                           AvalancheSchedulerSvc, AlgResourcePool, CPUCruncher)

evtslots = 1
evtMax = 1
cardinality = 1
threads = 1

whiteboard = HiveWhiteBoard("EventDataSvc", EventSlots=evtslots)

slimeventloopmgr = HiveSlimEventLoopMgr(
    SchedulerName="AvalancheSchedulerSvc", OutputLevel=DEBUG)

scheduler = AvalancheSchedulerSvc(ThreadPoolSize=threads, OutputLevel=VERBOSE)

AlgResourcePool(OutputLevel=DEBUG)

CPUCrunchSvc(shortCalib=True)

# Set up of CPU crunchers -------------------------------------------------------

a1 = CPUCruncher("A1")
# to skip algorithm 'A2', force early exit from the branch
# This leads to data flow stall
a1.InvertDecision = True

# this algorithm is not run due to early exit from the group it belongs to
a2 = CPUCruncher("A2")
a2.outKeys = ['/Event/a2']

a3 = CPUCruncher("A3")
a3.inpKeys = ['/Event/a2']

# Assemble control flow graph
branch = GaudiSequencer(
    "EarlyExitBranch", ModeOR=False, ShortCircuit=True, Sequential=True)
branch.Members = [a1, a2]

for algo in [a1, a2, a3]:
    algo.Cardinality = cardinality
    algo.avgRuntime = .1

# Application Manager ----------------------------------------------------------

ApplicationMgr(
    EvtMax=evtMax,
    EvtSel='NONE',
    ExtSvc=[whiteboard],
    EventLoop=slimeventloopmgr,
    TopAlg=[branch, a3],
    MessageSvcType="InertMessageSvc",
    OutputLevel=INFO)