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Real Time Trace & Real Time Profilling

Trace Streaming Real Time Profiling

2012/8/23 Thursday Lauterbach Academy Confidential Documents 1

Trace Streaming


Introduction

System Background

Streaming File

Streaming in Use

Introduction

The term Trace Streaming : means the recording, processing, and optional storage of streams of

trace data, while the target system is running and emitting new trace data.

Trace display and analysis is performed after the recording stopped


Introduction

Trace Streaming is one method to deal with Streamed data


Why do we need Trace Streaming


For our customer the trace memory is never big enough

System Background

A PowerTrace-II with AutoFocus-II preprocessor An Gbit Ethernet interface A fast host PC, especially for the cycle accurate analysis and

for nested analysis. A 64bit executable and OS are required for handling traces >

2G Frames target with ETMv3, Coresight,Nexus or PTM


System Background

Technical requirement

1. Compact raw data 2. Flexibility with respect to the time stamp 3. A good data compression before streaming 4. A good data compression before saving on the drive


The average data rate at the trace port should not exceed the maximum transmission rate between the trace memory of the tool and the host

System Background

Compact raw data (reduce information to be recorded)

1. Switch data-trace off 2. Configure the trace logic to generate trace information in a compact way e.g. Branch History Messaging for NEXUS on MPC5xxx/SPC56x Caveats: compact raw data reduce the accuracy of the TRACE32

hardware time-stamp 3. Configure TRACE32 to record trace information in a compact way e.g. ETM.PortFilter PACK for all ETMs Caveats: compact raw data reduce the accuracy of the TRACE32

hardware time-stamp


System Background

Flexibility with respect to the time stamp

Default 128 bit frames if no time stamp information is required the amount of

streaming data can be reduced. eg. ETM.PortFilter MAX for all ETMv3 and higher Smaller 64 bit frames (8x8 4x16 2x32) 2012/8/23 Thursday Lauterbach Academy Confidential Documents 9

96 bit trace raw data 32 bit time stamp

64 bit trace raw data

System Background

Good data compression (reduce information to be streamed) 1. PowerTrace II provides a FPGA-based hardware compression for the

trace information for the ETMv3 and higher (factor 6) 2. Otherwise software compression is used (factor 3)

Trace.STREAMCompression LOW | MID | HIGH 3. Trace.STREAMCompression MID | HIGH (on host: decompress –

compress - zip)

Max transmission rate: Trace memory of tool → host The command IFTEST /Warp provides an estimate of the transmission rate


System Background

Transmission rates 1. Max transmission rates for trace memory in CombiProbe

• Power Debug USB 2 about 14 MByte/s • Power Debug Ethernet about 10 MByte/s • PowerDebug II about 62 MByte/s

2. Max transmission rates for trace memory in PowerTrace • PowerTrace Ethernet /USB 2.0: about 14 MByte/s • PowerTrace Ethernet: about 10 MByte/s

3. Max transmission rates for trace memory in PowerTrace II • PowerDebug II & PowerTrace II/USB 2.0 about 14 MByte/s • PowerDebug II & PowerTrace II about 60 MByte/s


Streaming File

Default location

1. TRACE32 temp directory (OS.PTD()) • e.g. C:\Users\amartin\AppData\Local\Temp\

Default file name

1. <TRACE32_instance_ID>streama.t32 • e.g. andT32_1000004streama.t32

Default size limitation 1. less the 1 GByte free memory left on drive


Streaming File

User-defined location/file name

1. Trace.STREAMFILE <file> • e.g. Trace.STREAMFILE d:/temp/mystream.t32

User-defined size limitation 1. Trace.STREAMFileLimit <limit in bytes>

• e.g. Trace.STREAMFileLimit 5000000000 // 5 Gbyte as max.size • e.g. Trace.STREAMFileLimit -5000000000 // less then 5 Gbyte free memory left on the drive


Streaming in Use

Trace32 Configuration(Trace.Mode STREAM)


Streaming in Use

TRACE32 Configuration (ETMv3 – Code Coverage) ... ETM.DataTrace OFF ETM.PortFilter MAX Trace.STREAMCompression HIGH Trace.STREAMFileLimit 10000000000. Trace.STREAMFILE d:/temp/mystream.t32 Trace.Mode STREAM Trace.AutoInit ON ...


Streaming in Use

TRACE32 Configuration (NEXUS Power Architecture - extended)

... NEXUS.HTM ON Trace.STREAMFileLimit 10000000000. Trace.STREAMFILE d:/temp/mystream.t32 Trace.Mode STREAM ...


Streaming in Use


Streaming in Use

When the technical requirement are fulfilled, Trace STREAMing is useful: • Whenever the customer wants to extend his trace memory size • For Trace-based Code-Coverage in one measurement step


Real Time Profilings


Distinction streaming and Profiling

Requirements for Real-Time Profiling

RTP Explanation with Demos

Feature outlook

Distinction between Streaming and Real-Time Profiling Streaming (of raw trace data to disk)

Real-time Profiling(live update of changing results)


Real Time Profiling

Real-time Profiling: 1. live processing 2. live update of changing results 3. live writing to disk


Requirements for Real-Time Profiling

PowerTrace II with Autofocus I or CombiProbe Gbit Ethernet interface (USB is too slow) A fast host machine A host with 64bit OS is for large data sets >2G Frames An ARM target with ETMv3, Coresight or PTM


Requirements for Real-Time Profiling (Setup)

Working system setup for conventional tracing (No flow errors!) and enabling

Analyzer.ACCESS VM:

Copy all executed program code to the debugger's VM: 1. including interrupt and exception handlers and vectors 2. Necessary to decode the trace data stream without accessing the

target

All symbol information (“.elf files”) need to be loaded 1. required for decoding the trace data (RTS.ON) 2. required for interpreting the RTP file (RTS.LOAD)


Real-Time Profiling Setup

Copy all code to the debugger's VM:. 1. Copy ALL executed code to the VM: 2. Copy REALLY ALL executed code to the VM:. (including exception vectors, break & interrupts handlers, …) 3. Copy all code to the VM:

e.g. using Data.Load somefile.elf /plusVM Data.COPY P:0x8000++0x2000 VM:0x8000


RTP Explanation

RTP Operation modes Overview


Operation modes RTS.OFF, RTS.ON

RTS.OFF : no recording, no processing RTS.ON : recording and processing of data

live display of constantly updated results (RTS.STAT.*) live display of recorded trace data (RTS.LIST)

processing options: RTS.NestingMode.Flat : flat processing RTS.NestingMode.Tree : nested processing (call tree)

timing options : RTS.TImeMode.OFF : no real-time information RTS.TImeMode.Sampling : low-res ticks from preprocessor RTS.TImeMode.CycleAccurate : ETM-cycle accurate mode


Demo

Debugger Setup RTS.ON RTS.ISTATistics RTS.STATistics RTS.LIST


Operation mode RTS.LOAD

RTS.LOAD Accesses all information available in the RTS file that was recorded in the session with RTS.ON. Utilizes identical display commands RTS.ISTAT, RTS.STAT, RTS.LIST

RTS.FILE select streaming file name (used in RTS.ON, RTS.LOAD)

RTS.ON supports the following file options: RTS.FileMode.OFF : nothing is written, no RTS file is used RTS.FileMode.Summary : writes processing results RTS.FileMode.Tasks : additionally, writes task switch information RTS.FileMode.Full : additionally, writes full trace data


RTS.FileMode : supported commands by file mode


The Secret Revelations on RTS.ON

RTS.ON overwrites an existing streaming file. Any change in options (RTS.File, RTS. ModeTImMode, …)

resets RTS. If RTS was ON, it performs RTS.OFF / RTS.ON, see above.


Feature Outlook

Profiling for multi-core targets


Thank You!

Q & A

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