This technical data was produced for the U. S. Governmentunder Contract No. FA8721-09-C-0002, and issubject to the Rights in Technical Data-NoncommercialItems clause at(DFARS) 252.227-7013 (NOV 1995)
I n t e g r i t y - S e r v i c e - E x c e l l e n c e
Objective
• Primary objective: Reduce the cost of modeling SW performance (specifically in OPNET)– Hand created Software Performance Models
• Effort intensive• Schedule intensive
– Improve correlation of model to design– Improve quality of model
I n t e g r i t y - S e r v i c e - E x c e l l e n c e
Methodology
• Directly interface between UML design tools and SW performance analysis tools
• Utilize contractor UML sequence diagrams augmented with Schedulability, Performance and Time (SPT) data
• Create OPNET Model using two MITRE Java routines – Translate Rhapsody XMI into Software Performance Model Interchange
Format (S-PMIF by Connie Smith)• Common XML representation to exchange models between UML-based tools and
Performance engineering tools– Convert S-PMIF into an XML model that is imported into OPNET to use
Detailed Server Model to model SW
UML – Unified Modeling LanguageSPT- Schedulability, Performance and TimeXMI – XML Metadata Interchange
Industry Standards
Runtime - Process
S-PMIF – Software Performance Model Interchange FormatPossible Standard
UML – Sequence Diagrams
Response Time Statistics
I n t e g r i t y - S e r v i c e - E x c e l l e n c e
Potential Program Impact
• Reduction of effort to analyze design performance– Given UML model w SPT: reduced effort and schedule
• From Months to Day(s) - initial model• From Weeks to Day - updates
• More accurate model of performance– Confidence in correlation of analysis to UML architecture– No hand changes in model for new steps in SW threads– Better use of performance tool
• Given less cost/schedule required to do performance analysis contractor more likely to do the analysis– More likely to meet performance requirements earlier in
development phase - less costly point to do this work– Reduce cost of changes to design to meet performance
requirements– Resulting in higher compliance with requirements
I n t e g r i t y - S e r v i c e - E x c e l l e n c e
Example Problem(Numbers are Notional)
{8 Hz, 60 ms} {120 ms}
Sensor_BAC SP_BAC Radio
Sensor_ABM
{10 ms}
Munition
SP_ABM
{80 ms for tracking,10 Hz IFTU update}
Tracker_ABM
{6 Hz, 60 ms} {120 ms}
{125 ms point topoint}
IFTU
Detections
IFTUI_Q_Data
Detections
Detections
I_Q_Data
@260ms 30ms 60ms
60ms@310ms 30ms 40ms Detection
5ms
40ms
@90ms 20msIFTU update
25ms IFTU
IFTU In-flight Target Update
Priority 7
Priority 8 Priority 9
I n t e g r i t y - S e r v i c e - E x c e l l e n c e
Two Sensor & One Munition Thread
ABM Sensor Scenario
BAC Sensor Scenario
IFTU Scenario
Augmented with SPT Data (not shown)
I n t e g r i t y - S e r v i c e - E x c e l l e n c e
OPNET Layout
I n t e g r i t y - S e r v i c e - E x c e l l e n c e
Utilization by Resource
OPNET 3 day
RapidRMA
PN (30 sec run)
R2 0.0507
R8 - 0.0983R6 - 0.1173
R12 - 0.1964
R10 - 0.2341
R4 - 0.3580
R14 - 0.4185
I n t e g r i t y - S e r v i c e - E x c e l l e n c e
Thread Response Time
PN Results (6 Min run)OPNET: After 3 day run
BAC
ABM
IFTU
RapidRMA
I n t e g r i t y - S e r v i c e - E x c e l l e n c e
Modeling SW in OPNET
• Used Modeler and Detailed Server Model– Custom Application Model
• Model thread behavior in Tasks • Steps on same resource are SW
– Detail Server Model • Timing and priority on server jobs in Task (Thread)
• Considered using ACE Whiteboard Custom Application– Easier to do by hand: attach Jobs to Tiers– Harder to automate; C API; No XML interface– Additional License Required
I n t e g r i t y - S e r v i c e - E x c e l l e n c e
More Complex SW Example
I n t e g r i t y - S e r v i c e - E x c e l l e n c e
Other Issues and Next Steps
• Have implemented Fork of given thread into two asynchronous threads
• Are looking to modify Detailed Server model to handle two-thread-Join and sw-Locks
• Analyze specific military system’s design threads by moving into an environment that supports use of Contractor performance parameters
• Other programs interested in technology when ready– Requires synchronization between threads
