Benchmarking of RTIs for RealTime Applications

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• Benchmarking of RTIs for Real-Time Applications
• 03E-SIW-026
• Dr. Herbert TietjeIABG mbHtietje_at_iabg.de

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Overview

• Motivation
• Real-Time Execution Model
• Programs
• Results
• Summary

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Structure of MILSIM
MILSIM Man In the Loop SIMulation SILKA
Simulation of Air Combat
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Real-Time Execution Model
T. McLean, 01F-SIW-093
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Our Frame Structure
Slack time and tick combined (no sleep) Process
time and tick time as free parameters
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The Benchmark Programme

• Basis Benchmark suite from DMSO
• BmLatency
• BmOwnership
• BmThruput
• BmTimeAdv
• Usage RTBenchmark -r -d x -I
  RTinx.dat -O RToutx.dat
• 2 Federates (conceptually more)
• Versions for Windows, Linux, IRIX

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Classes of the RTBenchmark FOM

• Object class SimObject_S with 32 attributes of
  type string
• Interactions SimInteraction_S with 32 string
  parameters ExecutionManagement with
  subclasses
• Begin
• End
• CycleStart
• CycleStartOk
• ReportRequest
• Report
• RequestTimeSynchronization
• RespondToTimeSynchronization
• SetData
• SetTimeFrame

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Input data for the tests

• Input data are
• Datasets
• of objects, interactions
• and length of attributes, parameters
• of cycles
• Timesets
• Frame time
• Process time
• Send time
• Tick time
• Timesets are arranged in order of decreasing
  frame times with fixed process time (10 ms) and
  send time

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Principal results

• Data evaluated
• Percentage of the received object updates and
  interactions as function of the frame time
• Delay of received updates is analysed from
  histogram data
• Parameters for the tests
• of objects and interactions
• and length of attributes and parameters

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Received Percentage vs. Frame Time
Master Federate
Slave Federate
DMSO RTI NG 1.3v4, Windows
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of attributes
DMSO RTI NG 1.3v4, Linux
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Percentage and Time delay
Time delay for yellow curve (4 obj. 4 int.)
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HLA developments in Germany

• German Armed Forces Technical Center for
  Communications and Electronics, WTD 81 sponsors
  HLA projects
• GERTICO German RTI based on CORBA
• Y-SA (pSISA) proposed Standard Interface for
  Simulation Applications

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GERTICO vs. RTI NG 1.3v3
GERTICO
RTI NG 1.3v3
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Y-SA Architecture

• Object oriented interface, encapsulating the RTI
  services, for any FOM/SOM

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Comparison native Y-SA
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Summary

• Our benchmark programme simulates the
  time-stepped advance in real-time systems
• Received percentage falls below 100 at frame
  rates of the order of 10 Hz for RTI NG
• GERTICO shows slightly better performance than
  RTI NG
• Y-SA is not a performance killer