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Consumer #1
AIRBUS France - Simulation Industry and Software Departments - SVA September 2009 Page 31
© AIRBUS S.A.S. All rights reserved. Confidential and proprietary document.
Complete System
• The paradigm is applied the same way at the successive
communication layers of the architecture
AIRBUS France - Simulation Industry and Software Departments - SVA September 2009 Page 32
© AIRBUS S.A.S. All rights reserved. Confidential and proprietary document.
Time Management
• Mathematical Time Axis
! Time value going into mathematical computation
• Simulation Tick Axis
! Heart beat synchronizing the event steps
between the models
! Simulation kernel handles ticks between the
simulation objects: time is simulated
! A simulation step is the atomic synchronization of
the simulator between two simulation ticks
! Relative to time, simulation steps do not have the
same length
! Simulation objects can be “ticked” or not, in the
later the object is purely event based.
• Wall Clock Axis
! Absolute time
! This is the ONLY Link to REAL TIME
Need to scan the requirements to ensure
the 3-”times” are always separated
Wall Clock Time Axis
(Real Time)
Simulation Tick Axis
(Simulated Time)
Mathematical Time Axis
(Simulation application)
events
Commande
en vitesse de roulis
k
Commande
en assiette latérale
kp
Commande
en dérapage
Delta p
(commande ailerons
et spoilers)
Delta r
(commande direction)
Kret
Dérapage estimé
Vitesse de lacet
Vitesse de roulis
Assiette latérale
1/p
+
+ +
-
+
-
tick events
simulation
step
1
t (ms)
2 3 4
AIRBUS France - Simulation Industry and Software Departments - SVA September 2009 Page 33
© AIRBUS S.A.S. All rights reserved. Confidential and proprietary document.
Model the Simulator Architecture
• Simulate the simulator to define simulator topology
Host simulation & modeling September 2007 Page 33
S W
TaTsaTksaTksaksk TaTsaTksaksk
TaTsaTksaksk
Simulated Architecture Real Architecture
Task
Elected task
Scheduling Algorithm
AIRBUS France - Simulation Industry and Software Departments - SVA September 2009 Page 34
© AIRBUS S.A.S. All rights reserved. Confidential and proprietary document.
Overload case Nominal case
MAXIMUM
URGENCY
FIRST
RATE
MONOTONIC
Schedulable
OK
KO
MAXIMUM
URGENCY
FIRST
RATE
MONOTONIC
Schedulable
OK
OK
SW
MoSdWel
Model
SW
MoSdWel
Model
SW
MoSdWel
MoSdWel
MoSdWel
Model
SW
MoSdWel
MoSdWel
MoSdWel
Model
Priority
File
Priority Recommendations
AIRBUS France - Simulation Industry and Software Departments - SVA September 2009 Page 35
© AIRBUS S.A.S. All rights reserved. Confidential and proprietary document.
Prediction and Real Measures
• Comparison of results and prediction
Estimation of results :
Gain : better load balancing
CPU0 CPU1 CPU2
Simulated load 21 27 40
CPU0 CPU1 CPU2
11 38 40
18 37 50
7 1 10
Conf A3xx Not Optimized
Simulated load
Real load
Error
CPU0 CPU1 CPU2
21 27 40
25 27 49
Error 4 0 9
Simulated load
Real load
Conf A3xx Optimized
Recommendation :
- Priorities
- Assignment
Overload
Pathfinder Tool
AIRBUS France - Simulation Industry and Software Departments - SVA September 2009 Page 36
© AIRBUS S.A.S. All rights reserved. Confidential and proprietary document.
NODE U1 NODE U2
H W H W
H W
IO
IO IO
NODE U0
SW
Model
SW
Model
SW
Model
Simulation of an application in a distributed system
NODE => U0 U1 U2
es visuelcae solvol
bdvl irs
cdv
systeme
radio
moteur
env1
soupll
soreth
serv
bancnav
envcpi
0,38 0,289 0,501
RM General Task (iter=4)
Software modelisation
Hardware model
Site #1
Site #2 Site #3
Distribution Architect Tool
AIRBUS France - Simulation Industry and Software Departments - SVA September 2009 Page 37
© AIRBUS S.A.S. All rights reserved. Confidential and proprietary document.
• Schedulable passed, Display of object activities
　
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