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"""variableTimeRatio.py
Shows the SimulationRT capability to change the ratio simulation
time to wallclock time during the run of a simulation.
"""
from SimPy.SimulationRT import *
class Changer(Process):
def change(self,when,rat):
global ratio
yield hold,self,when
rtset(rat)
ratio=rat
class Series(Process):
def tick(self,nrTicks):
oldratio=ratio
for i in range(nrTicks):
tLastSim=now()
tLastWallclock=wallclock()
yield hold,self,1
diffSim=now()-tLastSim
diffWall=wallclock()-tLastWallclock
print "now(): %s, sim. time elapsed: %s, wall clock elapsed: "\
"%6.3f, sim/wall time ratio: %6.3f"\
%(now(),diffSim,diffWall,diffSim/diffWall)
if not ratio==oldratio:
print "At simulation time %s: ratio simulation/wallclock "\
"time now changed to %s"%(now(),ratio)
oldratio=ratio
initialize()
ticks=15
s=Series()
activate(s,s.tick(nrTicks=ticks))
c=Changer()
activate(c,c.change(5,5))
c=Changer()
activate(c,c.change(10,10))
ratio=1
print "At simulation time %s: set ratio simulation/wallclock time to %s"\
%(now(),ratio)
simulate(until=100,real_time=True,rel_speed=ratio)
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