FlameGraph | Stack trace visualizer | Code Inspection library

by brendangregg Perl Version: v1.0 License: No License

X-Ray Key Features Code Snippets Community Discussions(9)Vulnerabilities Install Support

kandi X-RAY | FlameGraph Summary

FlameGraph is a Perl library typically used in Code Quality, Code Inspection applications. FlameGraph has no bugs, it has no vulnerabilities and it has medium support. You can download it from GitHub.

Example (click to zoom):. Click a box to zoom the Flame Graph to this stack frame only. To search and highlight all stack frames matching a regular expression, click the search button in the upper right corner or press Ctrl-F. By default, search is case sensitive, but this can be toggled by pressing Ctrl-I or by clicking the ic button in the upper right corner. Other sites: - The Flame Graph article in ACMQ and CACM: - CPU profiling using Linux perf\_events, DTrace, SystemTap, or ktap: - CPU profiling using XCode Instruments: - CPU profiling using Xperf.exe: - Memory profiling: - Other examples, updates, and news:

Support

Quality

Security

License

Reuse

Support

FlameGraph has a medium active ecosystem.

It has 14828 star(s) with 1780 fork(s). There are 481 watchers for this library.

It had no major release in the last 12 months.

There are 100 open issues and 30 have been closed. On average issues are closed in 97 days. There are 45 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of FlameGraph is v1.0

Quality

FlameGraph has 0 bugs and 0 code smells.

Security

FlameGraph has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

FlameGraph code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

FlameGraph 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

FlameGraph releases are available to install and integrate.

Installation instructions are not available. Examples and code snippets are available.

It has 13253 lines of code, 0 functions and 1 files.

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

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FlameGraph Key Features

No Key Features are available at this moment for FlameGraph.

FlameGraph Examples and Code Snippets

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Community Discussions

Trending Discussions on FlameGraph

React devtool does not show reason why component rerendered

Why is Vec::with_capacity slower than Vec::new for small final lengths?

Construct flamegraph with start and end timestamps

What does the hook numbers in the Reactjs Dev tool correspond to?

Speeding up st_buffer on many line segments

How can you get frame-pointer perf call stacks/flamegraphs involving the C++ standard library?

ServerAsyncReaderWriter.Write is not async which performs tcp_write

async-profiler viewing list of profiling events supported by jvm

Can't read csv-file: "no method matching Parsers.Options"

QUESTION

React devtool does not show reason why component rerendered

Asked 2022-Feb-28 at 02:36

The react developer tool used to show why a component was rendered, e.g. due to state change, context update or because of a rerender of the parent. This information can not be found in the flamegraph anymore.

Did they remove it or are there some prerequisites in order for this information to be included?

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ANSWER

Answered 2022-Feb-28 at 02:36

I found the solution by pure chance today. There is a checkbox hidden in the settings on the profiler page which can be toggled to enable this setting..

Source https://stackoverflow.com/questions/71272424

QUESTION

Why is Vec::with_capacity slower than Vec::new for small final lengths?

Asked 2021-Dec-24 at 07:27

Consider this code.

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ANSWER

Answered 2021-Dec-24 at 07:27

I was not able to reproduce this in a synthetic benchmark:

Source https://stackoverflow.com/questions/70381285

QUESTION

Construct flamegraph with start and end timestamps

Asked 2021-Dec-15 at 01:46

i am collecting profile with custom instrumentation of each function and the format is simple. Each line in the profile dump has the following data:

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ANSWER

Answered 2021-Dec-15 at 01:46

a) No, because flamegraphs need call stacks, and b) flamegraphs are pretty but useless for finding speedups. Speed problems easily hide in them, and they usually ignore I/O. Also here.

Source https://stackoverflow.com/questions/70356489

QUESTION

What does the hook numbers in the Reactjs Dev tool correspond to?

Asked 2021-Nov-06 at 02:32

I have a react.js app that I want to profile for performance issues.

I'm using the react dev tool profiler in firefox.

I profile a specific interaction and get the flamegraph and the ranked time graph in the dev tool.

Then this message shows up in the dev tool:

This part of the dev tool is not interactive, and I can't find anything on how the hooks are numbered.

How do I interpret these numbers? What do they correspond to? Where can I find the information on what hooks they refer to?

...

ANSWER

Answered 2021-Nov-06 at 02:32

This is the PR where they added that feat. They didn't provide a better UI due to some performance constraints. But you can find what hooks those indexes correspond to if you go to the components tab in dev tools and inspect said component; in the hooks section, you'll have a tree of the called hooks, and for each hook, a small number at the left which is the index. You'll probably need to unfold the tree of hooks to find them.

Here's a screenshot from the linked PR

Source https://stackoverflow.com/questions/68925790

QUESTION

Speeding up st_buffer on many line segments

Asked 2021-Oct-04 at 15:51

I am buffering around a road network with many small line segments and it takes a long time. When I tried using the profiler to see what was making it take so long most of the time is occupied by ".Call". So I am wondering what is happening in the .Call section and is there anything I could do to speed up this process?

Here is a reproducible example:

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ANSWER

Answered 2021-Oct-04 at 15:51

Note that the .Call refers to an internal call within st_buffer. It probably calls c libraries or other optimized compiled code. It is unlikely that you will be able to easily speed this up. Simplifying your lines might be one way to speed up without hardly degrading the quality of you outcome, this can be done with st_simplify.

A bit more detail if you look at the code of sf:::st_buffer.sfc you see it calls: sf:::CPL_geos_op which in it self is basically a wrapper for a call to a internal compiled function.

Source https://stackoverflow.com/questions/69438335

QUESTION

How can you get frame-pointer perf call stacks/flamegraphs involving the C++ standard library?

Asked 2021-Jul-16 at 16:46

I like the fp method for collecting call stacks with perf record since it's lightweight and less complex than dwarf. However, when I look at the call stacks/flamegraphs I get when a program uses the C++ standard library, they are not correct.

Here is a test program:

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ANSWER

Answered 2021-Jul-06 at 13:04

With your code, 20.04 x86_64 ubuntu, perf record --call-graph fp with and without -e cycles:u I have similar flamegraph as viewed with https://speedscope.app (prepare data with perf script > out.txt and select out.txt in the webapp).

Is it possible to get correct fp call stacks with libstdc++ without compiling it myself (which seems like a lot of work)?

No, call-graph method 'fp' is implemented in linux kernel code in very simple way: https://elixir.bootlin.com/linux/v5.4/C/ident/perf_callchain_user - https://elixir.bootlin.com/linux/v5.4/source/arch/x86/events/core.c#L2464

Source https://stackoverflow.com/questions/68259699

QUESTION

ServerAsyncReaderWriter.Write is not async which performs tcp_write

Asked 2021-Jul-07 at 17:29

grpc version 1.26.0

language: c++

os: centos 7

As an async bidi streaming server, I expect ServerAsyncReaderWriter::Write is async, the actual work(say tcp_write/flush) would be done mostly in the background(maybe the default executor).

But actually, perf(perf record -F 99 -p xx -g -- sleep 90) shows ServerAsyncReaderWriter::Write directly calls tcp_write, and the default executor is almost idle all the time.

Walking down the source along ServerAsyncReaderWriter::Write -> Call::PerformOps -> Server::PerformOpsOnCall -> CallOpSet::FillOps -> grpc_call_start_batch -> ~ExecCtx -> ExecCtx::Flush -> grpc_combiner_continue_exec_ctx, I don't find any chance to give work to others...

Is this by design, or what's wrong?

...

ANSWER

Answered 2021-Jul-07 at 17:29

This looks to work as intended. gRPC C++ tries to use the given threads as much as possible. It uses another threads such only when it has to.

Source https://stackoverflow.com/questions/68279725

QUESTION

async-profiler viewing list of profiling events supported by jvm

Asked 2021-Jun-28 at 13:01

I am trying to view list of profiling events supported by jvm. As mentioned in the doc I have used the list command as shown below -

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ANSWER

Answered 2021-Jun-28 at 13:01

malloc here is not a separate event. It's just an example of an execution breakpoint.

async-profiler, with the assistance of the hardware breakpoints, can trace access to any memory location. Using the perf-like syntax for hardware breakpoints, you can choose to profile the execution of any given address in the code:

Source https://stackoverflow.com/questions/68162130

QUESTION

Can't read csv-file: "no method matching Parsers.Options"

Asked 2020-May-08 at 17:01

Reading in a csv file should be straight forward, right? But when I do this:

...

ANSWER

Answered 2020-May-08 at 17:01

Update the package:

Source https://stackoverflow.com/questions/61682272

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

Vulnerabilities

No vulnerabilities reported

Install FlameGraph

You can download it from GitHub.

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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