perf-tools | btrace script | Performance Testing library

by haitaoyao Java Version: Current License: No License

X-Ray Key Features Code Snippets Community Discussions(2)Vulnerabilities Install Support

kandi X-RAY | perf-tools Summary

perf-tools is a Java library typically used in Testing, Performance Testing applications. perf-tools has no bugs, it has no vulnerabilities, it has build file available and it has low support. You can download it from GitHub.

this is a tool to generate the btrace script for profiling.

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Quality

Security

License

Reuse

Support

perf-tools has a low active ecosystem.

It has 6 star(s) with 0 fork(s). There are 1 watchers for this library.

It had no major release in the last 6 months.

perf-tools has no issues reported. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of perf-tools is current.

Quality

perf-tools has 0 bugs and 0 code smells.

Security

perf-tools has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

perf-tools code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

perf-tools does not have a standard license declared.

Check the repository for any license declaration and review the terms closely.

Without a license, all rights are reserved, and you cannot use the library in your applications.

Reuse

perf-tools releases are not available. You will need to build from source code and install.

Build file is available. You can build the component from source.

perf-tools saves you 168 person hours of effort in developing the same functionality from scratch.

It has 417 lines of code, 33 functions and 8 files.

It has medium code complexity. Code complexity directly impacts maintainability of the code.

Top functions reviewed by kandi - BETA

kandi has reviewed perf-tools and discovered the below as its top functions. This is intended to give you an instant insight into perf-tools implemented functionality, and help decide if they suit your requirements.

Generate btrace script
Validates the parameters
Returns the set of method names
Analyze jar file
Analyze class
Analyze directory
Generate Btrace script
Writes a string to a file
Generate code
Analyze class file
Gets the class name
Returns a set of method names
Gets the script class name
Returns the script file name
Gets the simple class name
Set method names
Reads the contents of an InputStream and returns it as a String
Visits a method

Get all kandi verified functions for this library.

perf-tools Key Features

No Key Features are available at this moment for perf-tools.

perf-tools Examples and Code Snippets

No Code Snippets are available at this moment for perf-tools.

Community Discussions

Trending Discussions on perf-tools

Thread Utilization profiling on linux

How to use uprobe to trace OpenJDK HotSpot source code?

QUESTION

Thread Utilization profiling on linux

Asked 2018-Nov-09 at 18:44

Linux perf-tools are great for finding hotspots in CPU cycles and optimizing those hotspots. But once some parts are parallelized it becomes difficult to spot the sequential parts since they take up significant wall time but not necessarily many CPU cycles (the parallel parts are already burning those).

To avoid the XY-problem: My underlying motivation is to find sequential bottlenecks in multi-threaded code. The parallel phases can easily dominate the aggregate CPU-cycle statistics even though the sequential phases dominate wall time due to amdahl's law.

For java applications this is fairly easy to achieve with visualvm or yourkit which have a thread-utilization timelines.

Note that it shows both thread state (runnable, waiting, blocked) and stack samples for selected ranges or points in time.

How do I achieve something comparable with perf or other native profilers on linux? It doesn't have to be a GUI visualization, just a way to find sequential bottlenecks and CPU samples associated with them.

...

ANSWER

Answered 2018-Nov-09 at 17:06

You can get the result you want using a great tool we use to analyze Off-CPU Analysis - Off-CPU Flame Graphs which is apart of Flame Graphs

I used the Off-CPU analysis

Off-CPU analysis is a performance methodology where off-CPU time is measured and studied, along with context such as stack traces. It differs from CPU profiling, which only examines threads if they are executing on-CPU.

This tool is based on the tools you mentioned as the preferred ones - perf, bcctools, however, it provides a really easy to use output called flame graph which interactive SVG file looks like this SVG Off-CPU Time Flame Graph.

The width is proportional to the total time in the code paths, so look for the widest towers first to understand the biggest sources of latency. The left-to-right ordering has no meaning, and the y-axis is the stack depth.

2 more helpful analysis which are part of the Off-CPU Flame Graphs can also help you - Personally, I did not tried them.

Wakeup

This lets us solve more problems than off-CPU tracing alone, as the wakeup information can explain the real reason for blocking.

And Chain Graph

Chain graphs are an experimental visualization that associates off-CPU stacks with their wakeup stacks

There is also an experimental visualization which combines both CPU and Off-CPU flame graphs Hot/Cold Flame Graphs

This shows all thread time in one graph, and allows direct comparisons between on- and off-CPU code path durations.

It requires a little time to read about this profiling tool and understands its concepts, however, using it is super easy and its output is easier to analyze than other tools you mentioned above.

Good Luck!

Source https://stackoverflow.com/questions/45251182

QUESTION

How to use uprobe to trace OpenJDK HotSpot source code?

Asked 2018-Feb-01 at 00:41

I try to follow the instructions from link

In this example,

...

ANSWER

Answered 2018-Feb-01 at 00:41

C++ symbols are mangled in binary objects. You won't find minor_collection_begin. The mangled symbol name for void AdaptiveSizePolicy::minor_collection_begin() is

Source https://stackoverflow.com/questions/48535366

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install perf-tools

You can download it from GitHub.
You can use perf-tools like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the perf-tools component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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