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Application Report

SPRAA56 – September 2004

DSP/BIOS Real-Time Analysis (RTA) and Debugging

Applied to a Video Application

Brian Jeff DSP Field Software Applications

Arnie Reynoso Software Development Systems

ABSTRACT

DSP/BIOS and the Reference Frameworks allow developers to non-intrusively instrument

real-time applications. The software provided with this application note applies real-time

analysis (RTA) services to a working application—a H.263 encode/decode loopback

example for the TMS320DM642 evaluation module. The software demonstrates

techniques for benchmarking and controlling video software. It also introduces a service to

programmatically measure CPU and TSK loading. Debugging and troubleshooting

techniques for real-time applications, using Code Composer Studio, is also discussed.

Contents

Important Benchmarks for Video Applications.......................................................................... 2

Base Application Overview ......................................................................................................... 3

2.1

DSP/BIOS and RF5 Components Used.................................................................................. 5

2.2

Requirements for Viewing RTA Benchmarks .......................................................................... 7

Modifications to the Base Example............................................................................................. 7

3.1

Splitting the Encode and Decode CELLs ................................................................................ 8

3.2

Adding the Control TSK and MBX Communication ................................................................. 8

3.3

Querying the H.263 Encoder for Status .................................................................................. 9

3.4

Controlling the Frame Rate................................................................................................... 10

RTA Techniques for Performance Measurement ..................................................................... 11

4.1

Measuring Function Execution Time with the UTL Module ................................................... 11

4.2

Measuring Task Scheduling Latencies ................................................................................. 12

4.3

Measuring End-to-End Latencies.......................................................................................... 12

4.4

Measuring the Frame Rate ................................................................................................... 13

4.5

Simulating High CPU Load Stress Conditions with Dummy NOP Loads............................... 14

4.6

Programmatic Measurement of Total CPU Load................................................................... 14

4.7

Memory Bus Utilization......................................................................................................... 15

4.8

Bitrate and Frame Type........................................................................................................ 17

4.9

Methods for Transmitting Measured Performance Data........................................................ 18

4.10

Application-Specific Control via GEL Scripts in CCStudio..................................................... 19

Viewing Benchmarks in the Instrumented Application ........................................................... 19

5.1

Requirements ....................................................................................................................... 19

5.2

Running the Application........................................................................................................ 20

5.3

Interpreting the Benchmarks................................................................................................. 22

5.4

Controlling the Run-Time Parameters Dynamically............................................................... 25

References.................................................................................................................................. 26

Appendix A. Performance Impact..................................................................................................... 27

A.1

Overhead of Performance Measurement Techniques........................................................... 27

A.2

RTA Effects on CPU Load .................................................................................................... 27

A.3

Memory Footprint ................................................................................................................. 28

1 2 3 4 5 6 ... 28 29

Podsumowanie treści

Strona 1 - SPRAA56 – September 2004

Application Report SPRAA56 – September 2004 1 DSP/BIOS Real-Time Analysis (RTA) and Debugging Applied to a Video Application Brian Jeff DSP Field Sof

Strona 2

SPRAA56 10 DSP/BIOS Real-Time Analysis (RTA) and Debugging Applied to a Video Application This call returns a status structure of type IH263ENC_Statu

Strona 3 - 2 Base Application Overview

SPRAA56 DSP/BIOS Real-Time Analysis (RTA) and Debugging Applied to a Video Application 11 4 RTA Techniques for Performance Measurement The RTA techn

Strona 4

SPRAA56 12 DSP/BIOS Real-Time Analysis (RTA) and Debugging Applied to a Video Application 4.2 Measuring Task Scheduling Latencies Scheduling latency

Strona 5 - 2.1.1 LOG

SPRAA56 DSP/BIOS Real-Time Analysis (RTA) and Debugging Applied to a Video Application 13 The low-resolution CLK_getltime API is used instead of the

Strona 6 - 2.1.4 UTL

SPRAA56 14 DSP/BIOS Real-Time Analysis (RTA) and Debugging Applied to a Video Application last30frame.current = CLK_getltime(); // check to see if w

Strona 7

SPRAA56 DSP/BIOS Real-Time Analysis (RTA) and Debugging Applied to a Video Application 15 Window = 500ms (default) t0 t1 t0 t1 ‘minloop’ (in units

Strona 8

SPRAA56 16 DSP/BIOS Real-Time Analysis (RTA) and Debugging Applied to a Video Application In video applications that handle the full resolution of 72

Strona 9

SPRAA56 DSP/BIOS Real-Time Analysis (RTA) and Debugging Applied to a Video Application 17 These estimates are fairly accurate for the color conversio

Strona 10 - SPRAA56

SPRAA56 18 DSP/BIOS Real-Time Analysis (RTA) and Debugging Applied to a Video Application Most current encoders use three primary frame types: Intrac

Strona 11

SPRAA56 DSP/BIOS Real-Time Analysis (RTA) and Debugging Applied to a Video Application 19 The benchmarking routines send out selected benchmark data

Strona 12

SPRAA56 2 DSP/BIOS Real-Time Analysis (RTA) and Debugging Applied to a Video Application Figures Figure 1. Basic Data Flow of the Video Application..

Strona 13

SPRAA56 20 DSP/BIOS Real-Time Analysis (RTA) and Debugging Applied to a Video Application The application supplied with this note references board su

Strona 14

SPRAA56 DSP/BIOS Real-Time Analysis (RTA) and Debugging Applied to a Video Application 21 – Statistics View. Shows the values for STS objects used b

Strona 15 - 4.7 Memory Bus Utilization

SPRAA56 22 DSP/BIOS Real-Time Analysis (RTA) and Debugging Applied to a Video Application Figure 6. Workspace Including RTA Windows 5.3 Interpreti

Strona 16

SPRAA56 DSP/BIOS Real-Time Analysis (RTA) and Debugging Applied to a Video Application 23 Figure 7. Statistics View Showing Benchmark Measurements

Strona 17 - 4.8 Bitrate and Frame Type

SPRAA56 24 DSP/BIOS Real-Time Analysis (RTA) and Debugging Applied to a Video Application In the input and output tasks, Cell0 is the color conversio

Strona 18

SPRAA56 DSP/BIOS Real-Time Analysis (RTA) and Debugging Applied to a Video Application 25 5.3.2 Expected Values Delivered to the Message Log CPU loa

Strona 19 - 5.1 Requirements

SPRAA56 26 DSP/BIOS Real-Time Analysis (RTA) and Debugging Applied to a Video Application The value of N, which is used by modes 2 and 3, is 30 frame

Strona 20 - 5.2 Running the Application

SPRAA56 DSP/BIOS Real-Time Analysis (RTA) and Debugging Applied to a Video Application 27 Appendix A. Performance Impact A.1 Overhead of Performance

Strona 21

SPRAA56 28 DSP/BIOS Real-Time Analysis (RTA) and Debugging Applied to a Video Application A.3 Memory Footprint The total additional code size added t

Strona 22

IMPORTANT NOTICETexas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications,enhancements, improvemen

Strona 23

SPRAA56 DSP/BIOS Real-Time Analysis (RTA) and Debugging Applied to a Video Application 3 Quantization is the process of dividing a continuous range o

Strona 24

SPRAA56 4 DSP/BIOS Real-Time Analysis (RTA) and Debugging Applied to a Video Application Figure 1 shows a simplified view of the sequential flow of

Strona 25 - 5.4.1 Debug Mode

SPRAA56 DSP/BIOS Real-Time Analysis (RTA) and Debugging Applied to a Video Application 5 2.1 DSP/BIOS and RF5 Components Used The base application l

Strona 26 - 6 References

SPRAA56 6 DSP/BIOS Real-Time Analysis (RTA) and Debugging Applied to a Video Application 2.1.2 STS An STS object accumulates the following statistica

Strona 27 - A.2 RTA Effects on CPU Load

SPRAA56 DSP/BIOS Real-Time Analysis (RTA) and Debugging Applied to a Video Application 7 2.2 Requirements for Viewing RTA Benchmarks In order for an

Strona 28 - A.3 Memory Footprint

SPRAA56 8 DSP/BIOS Real-Time Analysis (RTA) and Debugging Applied to a Video Application DeviceDriverBuffer3 framesDeviceDriverBuffer3 framesDeviceDr

Strona 29

SPRAA56 DSP/BIOS Real-Time Analysis (RTA) and Debugging Applied to a Video Application 9 if(controlVideoProc.frameRateChanged) { txMsg.cmd = FRA

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