RapiTaskZero | Rapita Systems

Zero-footprint event-level scheduling analysis for critical software

Why choose RapiTask^Zero?

Gain insight into your application through scheduling analysis
Locate rare timing events that need attention
Identify bottlenecks in your application by analyzing capacity issues
Compare scheduling algorithms from different RTOSs
Visualize scheduling behavior of libraries without source code

Gain insight into your application through scheduling analysis

Understanding your application’s scheduling behavior can help you troubleshoot scheduling issues. RapiTask^Zero automatically collects information during program execution, presenting this data so you can follow the events that occurred in the test run.

Providing a timeline of the tasks that ran in your system, a wealth of charts and statistics, RapiTask^Zero lets you analyze your system’s scheduling behavior in-depth.

Locate rare timing events that need attention

RapiTask^Zero makes it easy to find rare timing events such as priority inversions in your system so you can fix them. By following your system’s tasks throughout execution, you can easily locate rare timing events, which can be visualized easily for example by color coding tasks according to priority.

Identify bottlenecks in your application by analyzing capacity issues

Bottlenecks in critical software can slow the system down or even cause it to fail as timing deadlines are missed. By letting you view the CPU utilization of each task in your system throughout your software execution, RapiTask^Zero helps you identify bottlenecks so you can fix them.

compare scheduling algorithms through common framework

Compare scheduling algorithms from different RTOSs

While there are many vendor-specific scheduling visualization tools, these are often only compatible with a single RTOS. RapiTask^Zero lets you understand your system’s scheduling behavior through a common framework no matter which RTOS you’re using.

This means less time learning new tools and more time testing and resolving issues.

Visualize scheduling behavior of libraries without source code

RapiTask^Zero lets you analyze the scheduling behavior of third-party libraries or other pieces of software for which you have no access to the source code.

As RapiTask^Zero analyzes a branch trace and a disassembly to produce results, it can do so even when you don’t have access to source code.

Product features

Zero footprint system event tracing Zero footprint system event tracing for critical software.
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Source to object code traceability Trace results collected from analyzing program execution to source code, where available.
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Platform support Supported compilers, instruction sets, trace capture mechanisms and RTOSs.
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Understand scheduling behavior Understand your system's scheduling behavior at a glance.
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Locate rare timing events Scan large traces for specific unusual situations.
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Analyze system capacity issues Identify and analyze capacity issues in your system.
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RTOS-independent scheduling visualization Understand program scheduling through a common framework no matter which RTOS you're using.
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Automate testing on host and target Run tests on host computers and test rigs in continuous build environments.
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Analyze code complexity Analyze the complexity of your source code.
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Efficient integration workflow Efficient integration workflow and inbuilt Platform Support Packages for integrations.
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RVS Project Manager Take your test project from creation to completion with an intuitive user-interface.
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Shared integration with zero-footprint RVS tools After integrating one zero-footprint RVS tool to work a development environment, it is trivial to use others.
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Portable test environments Multiple users can share the same test environment.
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Customizable workflow Customize the RVS workflow to best meet your needs.
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Template integrations Create and use template integrations to reduce your effort integrating RVS with your system.
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Customizable color scheme Customize the color scheme used to display your results.
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Comprehensive verification toolsuite One tool to meet all your software verification needs.
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Customizable task colors Customizable task colors help you highlight the tasks you're most interested in.
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Invocation Timeline Chart A timeline of your invocations helps you visualize the order of calls and how long each took to execute.
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Code viewer View code with syntax highlighting and color-coding of results.
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Easily filter results Easily filter results to focus your analysis.
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Visualize call dependencies Visualize the call dependencies in your code.
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Advanced search function Search reports for specific elements using advanced queries.
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Comprehensive language support Support for all languages that target machine code through zero-footprint analysis.
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C Support for verification of code written in C.
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C++ Support for verification of C++ code.
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Ada Support for verification of code written in Ada.
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Assembly Support for verification of Assembly code.
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Mixed language support Support for verification of code written in multiple languages.
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Flexible licensing options Select floating or node-locked licenses with annual or perpetual duration.
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Floating licenses Floating licenses support multiple users and shared working environments.
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Node-locked licenses Node-locked licenses support the use of RVS on a single machine.
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Annual licenses License RVS in annual increments.
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Perpetual licenses License RVS for use indefinitely.
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Easy to get started Integration and learning resources help you get started verifying your code in no time.
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Support Dedicated support service to resolve technical issues quickly.
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Training Get up to speed with custom training courses delivered by expert engineers.
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Documentation Learn how to use RVS features with comprehensive documentation in both printed and electronic formats.
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Multicore support Verify critical multicore systems.
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Easily migrate to new versions Easily migrate to new RVS versions with guided migration help.
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Software analysis by zero-footprint RVS tools has the following requirements:

The platform (target and any external devices e.g. debuggers) must be capable of producing a branch trace without gaps to ensure that the full program trace can be reconstructed.
The OS needs to make context switches observable. For some systems, supporting this may require modifications to be made to the OS.
A Platform Support Package (PSP) is needed for RVS to interface with the development environment, including the target hardware and trace capture mechanisms, in order to convert the branch trace into a format that the RVS tool understands and disassemble the executable and parse the resulting object code.

PSPs are developed to be compatible with the following:

Compilers
Instruction sets
Branch traces collected from the platform
Real-time operating systems

diagram showing hardware support on zero-footprint software

For a list of components that are already supported, see below. Note that we can add support for some components not listed below.

For detailed information on the requirements for zero-footprint tracing, see our Technical note.

For more information, contact info@rapitasystems.com.

Compilers

Platform Support Packages (PSPs) must be able to disassemble executables for further analysis. Typically, tools required for this are supplied as part of a toolchain unique to each compiler. The compilers PSPs already support are listed below:

Arm Compiler
CC-RH850
Clang
GCC

We can develop support for other compilers. For more information, contact us at info@rapitasystems.com.

Instruction sets

When code has been disassembled, Platform Support Packages (PSPs) must be able to understand the instruction set of the object code so they can parse it before it is used for subsequent analysis by zero-footprint RVS tools. The instruction sets PSPs already support are listed below:

68k
AArch64
ARM
PowerPC
RH850
VISIUM
x86

We can develop support for other instruction sets. For more information, contact us at info@rapitasystems.com.

Branch traces

For it to be possible to analyze executables generated by a platform by zero-footprint RVS tools, it must be possible to collect a branch trace from the platform*. Some targets generate branch traces by default, for example:

Boards that have been developed to meet at least Class 2 of the Nexus message-based trace protocol
ARM boards including an ARM ETM component
Custom boards developed to produce branch traces

A debugger may be used to collect these branch traces from the target. Simulators may generate branch traces, or it may be possible to modify them to do so. Each Platform Support Package (PSP) is designed to support branch traces collected by a specific debugger or from a specific simulator. The debuggers and simulators PSPs already support are listed below:

^† a modified version is available, which supports zero-footprint analysis
Debuggers	Simulators
Lauterbach TRACE32	QEMU^†
PARTNER-Jet2

We can develop support for other debuggers and simulators. For more information, contact us at info@rapitasystems.com.

*In some cases, other approaches may be possible, such as using a branch map.

Real-time operating systems

For it to be possible to analyze executables generated by a platform by zero-footprint RVS tools, it must be possible to collect information on context switches made during software execution. Whether this is possible or not depends on the real-time operating system (RTOS) used and its configuration. Platform Support Packages must be able to understand context switch information to support further analysis of an executable by zero-footprint RVS tools. The RTOSs PSPs already support are listed below:

eMCOS for AUTOSAR Adaptive Platform
eMCOS for AUTOSAR Classic Platform (RV850)
FreeRTOS
SafeRTOS
SYSGO PikeOS®
Bare Metal (no OS)

We can develop support for other real-time operating systems. For more information, contact us at info@rapitasystems.com.

Operating systems

Zero-footprint RVS tools can be used to analyze software run on any host operating system.

Operating System
Windows 10 and 11
Windows Server 2019+
Variety of Linux distributions (including Ubuntu and Red Hat)
For older operating systems, contact us.

Programming languages

Language
Any language that targets machine code
Mixed languages

Multicore systems

Zero-footprint RVS tools can be used to analyze software from multicore systems.

Suitable branch trace(s) can be collected in one of two ways:

Collecting a separate branch trace from each core
Collecting a branch trace that includes results from all cores, where it’s possible to derive the core from which each branch was taken

Instrumentation-based vs instrumentation-free analysis

Both RapiTask and RapiTask^Zero support task-level scheduling visualization for critical software. Depending on your project and needs, one or both solutions may be better for you. Consult the table below to determine which is best for your project.

Features
Works without source code	No	Yes
Works without Instrumentation	No	Yes
Integration with development environment	Integration needed	No integration needed
Tool qualification support	Yes	Not yet available - contact us
Trace size and data processing time	Depends on applied instrumentation	Typically larger trace and longer data processing times
Supported platforms (target, data collection mechanism)	Flexible, almost any platform supported (see compatibility)	Requirements on platform (branch trace and context switch information must be available), PSP (see compatibility)

Frequently asked questions

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How large a code base can RVS tools handle?
RVS tools are designed to handle very large code bases. Because of the efficient algorithms used by RVS tools, there is no fundamental limitation to the number of lines of code that RVS can process, and our RVS tools have been used on projects with millions of lines of code.
How are RVS products licensed?
We offer both “Node-locked” and “Floating” licenses, and a license server to support use of our tools in your specific development environment.

For more information on our licensing models, see our RVS licensing FAQs.
What happens if I encounter an issue while using an RVS tool?
All RVS licenses include access to our dedicated in-house support team, who will work with you to provide a rapid fix to your issue. This is a critical part of our vision. During 2021, we resolved 63% of our support requests within 7 working days and 93% within 30 working days. We also inform our customers of known issues via our website and email.
How do you support RVS users?
We provide an extensive set of RVS documentation with each of our products, and offer training courses guiding you through the most effective use of RVS tools. All our users can benefit from privileged access to our website, which includes downloads for new product releases.
What is RapiTask Zero?
RapiTask^Zero is a scheduling visualization tool that requires no project source code or modification of the development environment being used. To extract task-level scheduling information from a program, RapiTask^Zero analyzes branch trace information collected from a compatible target or data collection mechanism.

As part of the RVS toolsuite, it forms part of a software verification solution that also includes tools for structural coverage analysis, worst-case execution time analysis and functional testing.
How does RapiTask Zero work?
RapiTask^Zero uses two types of inputs from which to produce task-level scheduling results. The first is the executable file and a disassembly of it, and the second is a branch trace collected while the program under analysis is executed. From these inputs, RapiTask^Zero can understand both the program structure and the events that occurred during the program execution, allowing it to perform task-level scheduling analysis and produce results.
Why do I need RapiTask Zero when I have tools from my RTOS vendor?
RapiTask^Zero is OS-agnostic so you can keep the same visualization and metrics if you change OS, and you can use RapiTask^Zero results as a point of reference to compare operating systems.

Additionally, you can capture and display custom events not related to the operating system (for example ARINC 429 messages) and display them in the trace.
How does RapiTask Zero show OS events such as inter-process communication (semaphores, messages), timers, hardware I/O etc?
RapiTask^Zero is OS-agnostic; as with all Rapita tools the integration with the operating environment needs to be customized. If we can get information about items of interest from the OS we can add ‘user events’ to a RapiTask^Zero trace.
Can I use RapiTask Zero to analyze the behavior of multicore architectures?
As with all RVS tools, RapiTask^Zero supports data collection on multicore architectures. To analyze the task-level scheduling behavior of multicore architectures, RapiTask^Zero simply needs to know which branches corresponded to which core during program execution. This information can be inferred by providing a combined trace that includes information on the core on which each branch was taken.
How are my results presented?
RapiTask^Zero displays results in two applications, the RVS Project Manager that is shared with all RVS tools, and an application specifically designed to display task scheduling information. You can synchronize the two applications to ensure that you can easily identify specific timing events in your system.

RapiTask^Zero 's Invocation Timeline Chart helps you to understand the high-level scheduling behavior of your system at a glance.
If I have RapiTime or RapiTime Zero, do I still need RapiTask or RapiTask Zero?
RapiTime and RapiTime^Zero abstract away from the OS tasking model and only report the execution time of a task as if it were the only thing running on the CPU. If you are interested in the response time of your code, or the interaction between tasks and your OS, you'll need RapiTask or RapiTask^Zero.
Which languages does RapiTask Zero support?
As RapiTask^Zero analyzes object code directly to produce results, it supports any language that targets machine code.
How do I learn more about RapiTask Zero?
You can request a trial version of RVS, which includes RapiTask^Zero. You can also arrange a demonstration, where a member of our team will work with you to show the benefits that RapiTask^Zero can offer you.
Which platforms and data collection mechanisms do zero-footprint RVS tools support?
Software analysis by zero-footprint RVS tools has the following requirements:
- The platform (target and any external devices e.g. debuggers) must be capable of producing a branch trace without gaps to ensure that the full program trace can be reconstructed.
- The OS needs to make context switches observable. For some systems, supporting this may require modifications to be made to the OS.
- A Platform Support Package (PSP) is needed for RVS to interface with the platform, including the target hardware and trace capture mechanisms, in order to convert the branch trace into a format that the RVS tool understands and disassemble the executable and parse the resulting object code. PSPs are developed to be compatible with four components of the platform: Compilers, Instruction sets, Branch traces and Real-time operating systems.
For more information on the requirements for software analysis by zero-footprint RVS tools and a list of currently supported platforms, see our Platform support page.

For more detailed information on the requirements, see our Technical note.
Can I view my results in the context of my project source code?
If your source code is available, yes. By importing your source code and debug symbols into your RVS project, you can view your results in the context of both your object and source code, and trace between them.
How long has RVS been used for software verification?
The Rapita Verification Suite (RVS) has been used in the critical embedded industry for over 15 years and supported a number of avionics projects globally. Qualification kits for qualified RVS products have supported more than 20 DO-178B and C certification projects up to and including DAL A.
How does RVS support Enterprise licensing?
Floating RVS licenses follow an “Enterprise” model. You can use them across geographical boundaries*, in different projects, with different users, and share them with suppliers working on the same project.

^*Some floating licenses may be restricted to use within a specific geographical region. Where this is the case, this is agreed before licenses are issued.
What are Platform Support Packages and why are they needed?
Platform Support Packages are required to support software analysis by zero-footprint RVS tools. They interface between the tools and the platform in order to do the following:
- Convert the specific format of native branch traces generated by the platform into a format that the RVS tool understands and can use for subsequent analysis.
- Disassemble the object code to understand the structure and control flow of the code so this can be used for subsequent analysis.
Each PSP is designed to support various components of a platform. These include:
- The compiler(s) used to generate executables
- The instruction set of object code to be analyzed
- The native branch trace format generated from the platform – this depends on the mechanism used to generate branch traces, which may be the target hardware (or simulator) or a third-party device e.g. debugger.
- The real-time operating system.
Different PSPs are needed to support analysis by zero-footprint RVS tools when any of the above items are different between two platforms. For more information on how PSPs support analysis by zero-footprint RVS tools, see our Requirements for zero-footprint RVS analysis Technical note.
Is a Platform Support Package available for my platform?
To see whether we have already developed PSPs compatible with the components on your platform, see our zero-footprint Platform support.

If we have not yet developed PSPs compatible with one or more components of your platform, we may be able to develop them. For more information, contact us at info@rapitasystems.com.

Check PSP compatibility
Can I create and manage groups for my floating RVS licenses?
Yes, you can create and manage groups of users for your floating RVS licenses. You can restrict each group to only serve licenses to specific hostnames or IP addresses. This allows you to reserve licenses for specific groups or specific purposes such as supporting the use of RVS on a continuous integration server.

Any licenses that you don’t reserve will remain available as floating licenses that can be shared among different users and geographic locations.
How does RVS support the analysis of shared code compiled by build systems with multiple executables?
RVS supports the analysis of shared code compiled by build systems with multiple executables by letting you specify the source files that will be compiled in each executable.

If you have functions that are declared in multiple components with the same name but have different definitions, RVS can treat each such function uniquely, for example to provide separate coverage in RapiCover and separate execution time results in RapiTime.
How can RVS help me understand my code base?
RVS analyzes the structure of your code and presents information on your code’s structure, helping you understand your code and its dependencies in a variety of forms such as the following:
- RVS analyzes the McCabe complexity of your code and presents the complexity of each code element, letting you easily identify code with high complexity.
- RVS Treemaps present the hierarchy of your code’s components and source files graphically.
- RVS lets you view and explore the call dependencies in your code.

Is instrumentation-based or instrumentation-free analysis best for me?

Both RapiTask and RapiTask^Zero support task-level scheduling visualization for critical software.

Depending on your project and needs, one or both solutions may be better for you. Consult the table below to determine which is best for your project.

Feature	RapiTask	RapiTask^Zero
Works without source code	No	Yes
Works without instrumentation	No	Yes
Integration with development environment	Integration needed	No integration needed
Trace size and data processing time	Depends on applied instrumentation	Typically larger trace and longer data processing times
Supported platforms (target, data collection mechanism)	Flexible, almost any platform supported (see compatibility)	Requirements on platform (branch trace and context switch information must be available), PSP needed (see compatibility)

Compiler,TI Compiler,Roadmap

Compiler,Diab,Roadmap

Simulator,ARM Fast Models Generic/TarmacTrace,Roadmap

Simulator,TRACE32 Simulator,Roadmap

Simulator,Gremlin,Roadmap

Compiler,Arm Compiler,Already available

Compiler,CC-RH850 ,Already available

Compiler,Clang,Roadmap

Compiler,Code Composer,Roadmap

Compiler,GCC,Already available

Compiler,GNAT,Roadmap

Compiler,Tasking,Roadmap

Compiler,Other compiler,Not on the roadmap

Instruction set,AArch64,Already available

Instruction set,ARM,Already available

Instruction set,AURIX TriCore,Roadmap

Instruction set,PowerPC,Roadmap

Instruction set,RH850,Already available

Instruction set,RISC-V,Roadmap

Instruction set,VISIUM,Already available

Instruction set,x86,Already available

Instruction set,Other instruction set,Not on the roadmap

Debugger,Intel Processor Trace,Roadmap

Debugger,iSystem,Roadmap

Debugger,Lauterbach TRACE32,Already available

Debugger,PARTNER-Jet2,Already available

Debugger,Other debugger,Not on the roadmap

Simulator,ASTC VLAB,Roadmap

Simulator,MachineWare SIM-V,Roadmap

Simulator,QEMU* AArch64,Already available

Simulator,QEMU* Arm,Already available

Simulator,QEMU* x86,Already available

Simulator,Other simulator,Not on the roadmap

RTOS,None (Bare Metal),Already available

RTOS,DDC-I Deos,Roadmap

RTOS,eMCOS for AUTOSAR Adaptive Platform,Already available

RTOS,eMCOS for AUTOSAR Classic Platform (RV850),Already available

RTOS,FreeRTOS,Already available

RTOS,Green Hills INTEGRITY,Roadmap

RTOS,Lynx Software LynxOS,Roadmap

RTOS,SYSGO PikeOS,Roadmap

RTOS,SafeRTOS,Roadmap

RTOS,Wind River VxWorks,Roadmap

RTOS,Other RTOS,Not on the roadmap

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Zero-footprint event-level scheduling analysis for critical software