flamegraph | Flamegraph profiling support for Ruby | Monitoring library

 by   SamSaffron HTML Version: Current License: MIT

kandi X-RAY | flamegraph Summary

kandi X-RAY | flamegraph Summary

flamegraph is a HTML library typically used in Performance Management, Monitoring applications. flamegraph has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can download it from GitHub.

Flamegraph support for arbitrary Ruby apps. Note, flamegraph support is built in to rack-mini-profiler, just require this gem and you should be good to go. Type ?pp=flamegraph to create one for the current page.
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            kandi-support Support

              flamegraph has a low active ecosystem.
              It has 372 star(s) with 37 fork(s). There are 13 watchers for this library.
              OutlinedDot
              It had no major release in the last 6 months.
              There are 7 open issues and 7 have been closed. On average issues are closed in 148 days. There are 4 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of flamegraph is current.

            kandi-Quality Quality

              flamegraph has no bugs reported.

            kandi-Security Security

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

            kandi-License License

              flamegraph is licensed under the MIT License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              flamegraph releases are not available. You will need to build from source code and install.
              Installation instructions, examples and code snippets are available.

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            flamegraph Key Features

            No Key Features are available at this moment for flamegraph.

            flamegraph Examples and Code Snippets

            No Code Snippets are available at this moment for flamegraph.

            Community Discussions

            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

            QUESTION

            Export Sub-Function in Node.js
            Asked 2020-Feb-29 at 13:15

            I'm trying to export update() sub-function from following module which looks like:

            ...

            ANSWER

            Answered 2018-Feb-15 at 16:15

            Just have flameGraph return the update function!

            Source https://stackoverflow.com/questions/48810501

            QUESTION

            Statistical Profiling in Python
            Asked 2019-Dec-02 at 15:03

            I would like to know that the Python interpreter is doing in my production environments.

            Some time ago I wrote a simple tool called live-trace which runs a daemon thread which collects stacktraces every N milliseconds.

            But signal handling in the interpreter itself has one disadvantage:

            Although Python signal handlers are called asynchronously as far as the Python user is concerned, they can only occur between the “atomic” instructions of the Python interpreter. This means that signals arriving during long calculations implemented purely in C (such as regular expression matches on large bodies of text) may be delayed for an arbitrary amount of time.

            Source: https://docs.python.org/2/library/signal.html

            How could I work around above constraint and get a stacktrace, even if the interpreter is in some C code for several seconds?

            Related: https://github.com/23andMe/djdt-flamegraph/issues/5

            ...

            ANSWER

            Answered 2018-Feb-28 at 18:29

            Have you tried Pyflame? It's based on ptrace, so it shouldn't be affected by CPython's signal handling subtleties.

            Source https://stackoverflow.com/questions/49030629

            QUESTION

            Is there a way to make interactive standalone SVGs in a webpage?
            Asked 2019-Sep-07 at 19:18

            Current libraries for making "interactive SVGs" in the web-browser are actually using javascript to manipulate a svg object in the page dynamically but don't actually embed the full javascript needed to animate the SVG in the svg tag itself. Libraries like d3.js, protovis, svg.js, etc.

            But it's possible to create standalone interactive SVGs, for example Brendan Gregg's flamegraph tool, example: http://www.brendangregg.com/FlameGraphs/cpu-bash-flamegraph.svg

            Is there any way to create a standalone, interactive SVG in a webpage? Of course, you could generate the interactive SVG serverside (for example, Brendan uses a Perl library to generate the interactive SVG) and then serve that to the user. But I'd prefer to generate the SVG as part of generating the webpage itself, i.e. in Php or Ruby or, even better, client-side with a Javascript library. In either case, the key feature goal is to be able to right-click-download the custom-made interactive SVG.

            Note: The benefit of the d3.js approach is that the animation can be integrated between the SVG and other DOM elements on the page, or have interaction with the SVG trigger dynamic AJAX requests. I'm not expecting the stand-alone SVG to be able to do these things.

            ...

            ANSWER

            Answered 2019-Sep-07 at 19:08

            As mentioned in the comments, You can inline an interactive SVG into the src= of an DOM element using a data: URI.

            Unfortunately, current web browsers don't have right click -> download for elements, only for tags. We can't use because that tag won't run the javascript code inside the SVG for security reasons.

            Luckily, we can hack in our own download link using javascript as follows:

            Source https://stackoverflow.com/questions/57829758

            QUESTION

            Understanding javascript cpu profiles
            Asked 2019-May-30 at 06:07

            Google Chrome and also the NodeJs inspector allow to generate a cpu profile with the following JSON structure:

            excerpt

            ...

            ANSWER

            Answered 2019-Jan-03 at 13:40

            For every profile id in samples there is also a microsecond measurement in timeDeltas.

            Combining the ids inside samples with the entries inside nodes allowed me to get all information needed.

            After that it is possible to add up all parents of the nodes and to calculate the execution time.

            In the end all equal parents are merged together for faster chart renderings.

            You can take a look at the code which is also released on github and npm:

            Code:

            Source https://stackoverflow.com/questions/53999609

            QUESTION

            no connection pool with primary found
            Asked 2019-Mar-22 at 15:41

            I am using Rails and am experiencing a connection pool error very randomly and it does not target any single endpoint specifically. I can hit endpoints about 70% of the time without getting this error. The database is PostgreSQL running on Google Cloud. Here's the main stuff of the error I'm getting:

            ...

            ANSWER

            Answered 2019-Mar-22 at 15:41

            First: gem uninstall sqlite then in gemfile change it for:

            gem 'sqlite3', '~> 1.3.6' bundle install

            rake db:migrate and restart server

            Should works :)

            Source https://stackoverflow.com/questions/52106397

            QUESTION

            Is it possible to use eBPF or perf to calculate time spent in individual traced functions?
            Asked 2019-Mar-07 at 17:01

            Currently, I can tell trace-cmd (an ftrace front-end) to use ftrace's function graph infrastructure to trace a specified workload. Using some trace data processing tools, I can look at the frequency with which functions were called and the corresponding total duration across each of the function calls. Example output might look like the following, where I trace ext4 function calls generated by my workload:

            ...

            ANSWER

            Answered 2017-Oct-31 at 06:32

            Absolutely, it is possible to use eBPF to do that.

            There's actually a tool that does something similar in the bcc tools. funclatency traces a set of functions and display the histogram of their latencies (time spent in the function at each call):

            Source https://stackoverflow.com/questions/47020119

            QUESTION

            Google App Engine Flexible get access to a folder dynamically created by a package?
            Asked 2018-Apr-10 at 22:24

            I am doing Profiling on my NodeJs app, I am using Google App Engine Flexible and for it, I am using npm 0x, but the thing is as this package is making the flamegraph inside my NodeJs root directory folder, now how can I retrieve this folder(I mean get access to this folder). I have SSH to my App Engine Flexible instance but there were two folders vm-runtime-app, vmagent but there my NodeJs Source code root directory is not there.

            ...

            ANSWER

            Answered 2018-Apr-10 at 22:24

            It's because the GAE instance launch the app into a Docker container. After you SSH to your instance, you need to spawn a shell into the container that runs your app

            Here are the steps after you SSH to your instance:

            Source https://stackoverflow.com/questions/49733289

            QUESTION

            All tests throwing TypeError: no implicit conversion of nil into String
            Asked 2018-Feb-12 at 20:13

            UPDATE 20180209: I created a new dummy app with what comes with the initial Rails 5.1.4 install (which includes minitest 5.11.3) and tests completed without issue. Going to continue to experiment with the gemfile to see if I can't narrow down what in the world may be causing this problem...

            If you have any ideas or pointers, please let me know!

            I recently started testing a new portion of my codebase and I've discovered a very critical issue. For whatever reason, every test is now throwing the titled error. Looking into the trace, it looks like for some reason the quoted name/title of my tests is causing a problem. Going back and running tests that I know were passing (though admittedly on earlier gem versions) unfortunately yields the same results, as shown below with the User model.

            I've tried everything I know to do, including completely removing and reinstalling RVM, Rails, and Ruby. I've even tried versioning Minitest to an earlier build, like 10.5.3, but still no luck. I've spent most of the day trying to fix this; I'm at my wits end and desperately need help! Though I've learned the hard way that I now need to explicitly version protect ALL of my gems ;)

            Thank you in advance! Please let me know if you need me to include any more files/snippets. I'll do my best to reply to any questions as my schedule allows, hopefully within 24 hours.

            Returned trace:

            E

            Error: UserTest#test_should_be_valid: TypeError: no implicit conversion of nil into String

            /home/blake/.rvm/gems/ruby-2.4.1@land_app/gems/railties-5.1.4/lib/rails/test_unit/reporter.rb:70:in method': undefined methodtest_should_be_valid' for class Minitest::Result' (NameError) from /home/blake/.rvm/gems/ruby-2.4.1@land_app/gems/railties-5.1.4/lib/rails/test_unit/reporter.rb:70:informat_rerun_snippet' from /home/blake/.rvm/gems/ruby-2.4.1@land_app/gems/railties-5.1.4/lib/rails/test_unit/reporter.rb:23:in record' from /home/blake/.rvm/gems/ruby-2.4.1@land_app/gems/minitest-5.11.3/lib/minitest.rb:803:inblock in record' from /home/blake/.rvm/gems/ruby-2.4.1@land_app/gems/minitest-5.11.3/lib/minitest.rb:802:in each' from /home/blake/.rvm/gems/ruby-2.4.1@land_app/gems/minitest-5.11.3/lib/minitest.rb:802:inrecord' from /home/blake/.rvm/gems/ruby-2.4.1@land_app/gems/minitest-5.11.3/lib/minitest.rb:334:in run_one_method' from /home/blake/.rvm/gems/ruby-2.4.1@land_app/gems/minitest-5.11.3/lib/minitest.rb:321:inblock (2 levels) in run' from /home/blake/.rvm/gems/ruby-2.4.1@land_app/gems/minitest-5.11.3/lib/minitest.rb:320:in each' from /home/blake/.rvm/gems/ruby-2.4.1@land_app/gems/minitest-5.11.3/lib/minitest.rb:320:inblock in run' from /home/blake/.rvm/gems/ruby-2.4.1@land_app/gems/minitest-5.11.3/lib/minitest.rb:360:in on_signal' from /home/blake/.rvm/gems/ruby-2.4.1@land_app/gems/minitest-5.11.3/lib/minitest.rb:347:inwith_info_handler' from /home/blake/.rvm/gems/ruby-2.4.1@land_app/gems/minitest-5.11.3/lib/minitest.rb:319:in run' from /home/blake/.rvm/gems/ruby-2.4.1@land_app/gems/railties-5.1.4/lib/rails/test_unit/line_filtering.rb:9:inrun' from /home/blake/.rvm/gems/ruby-2.4.1@land_app/gems/minitest-5.11.3/lib/minitest.rb:159:in block in __run' from /home/blake/.rvm/gems/ruby-2.4.1@land_app/gems/minitest-5.11.3/lib/minitest.rb:159:inmap' from /home/blake/.rvm/gems/ruby-2.4.1@land_app/gems/minitest-5.11.3/lib/minitest.rb:159:in __run' from /home/blake/.rvm/gems/ruby-2.4.1@land_app/gems/minitest-5.11.3/lib/minitest.rb:136:inrun' from /home/blake/.rvm/gems/ruby-2.4.1@land_app/gems/minitest-5.11.3/lib/minitest.rb:63:in block in autorun' from /home/blake/.rvm/gems/ruby-2.4.1@land_app/gems/spring-2.0.2/lib/spring/application.rb:171:infork' from /home/blake/.rvm/gems/ruby-2.4.1@land_app/gems/spring-2.0.2/lib/spring/application.rb:171:in serve' from /home/blake/.rvm/gems/ruby-2.4.1@land_app/gems/spring-2.0.2/lib/spring/application.rb:141:inblock in run' from /home/blake/.rvm/gems/ruby-2.4.1@land_app/gems/spring-2.0.2/lib/spring/application.rb:135:in loop' from /home/blake/.rvm/gems/ruby-2.4.1@land_app/gems/spring-2.0.2/lib/spring/application.rb:135:inrun' from /home/blake/.rvm/gems/ruby-2.4.1@land_app/gems/spring-2.0.2/lib/spring/application/boot.rb:19:in ' from /home/blake/.rvm/rubies/ruby-2.4.1/lib/ruby/site_ruby/2.4.0/rubygems/core_ext/kernel_require.rb:55:inrequire' from /home/blake/.rvm/rubies/ruby-2.4.1/lib/ruby/site_ruby/2.4.0/rubygems/core_ext/kernel_require.rb:55:in require' from -e:1:in'

            This is from a fairly standard User model test that has not raised issues before...

            user.rb

            ...

            ANSWER

            Answered 2018-Feb-12 at 20:13

            Got this sorted out by reverting to an earlier commit when things were working as expected, and pulled in needed updates through a $ git checkout approach.

            If I had to guess I think the problem I was having may have had something to do with my intervening update to 2.5.0 through RVM, which introduced more headaches than it was worth (not Rails's fault, or even RVM's since 2.5.0 isn't yet officially supported by RVM).

            Source https://stackoverflow.com/questions/48698622

            QUESTION

            Does Firefox allow profiling JS apps using "aggregated" flame charts?
            Asked 2018-Feb-01 at 19:55

            Firefox Developer Tools support flame charts, but it seems time is used as X-axis:

            In the Flame Chart view itself, along the X-axis is time. The screenshot above covers the period from 1435ms to a little past 1465ms. Along the Y-axis are the functions on the call stack at that point in time, with the top-level at the top, and the leaf function at the bottom. Functions are color-coded to make them easier to distinguish.

            Usually, flame charts use percentage as X axis, for instance: pyflame or Brendan Gregg's flame graphs.

            I find the time-based flame charts confusing and miss the ability to get aggregated times per function (similar to Call Tree as far as content is concerned, but represented in more visual way). Also, if a function is short but is called many times it is easy to miss it, while on "aggregated" flame charts it would stand out prominently. To see why time-based flame charts are confusing, let me borrow example from another post - admittedly in Chrome, but the problem is similar:

            Even if some function took 30% of total time, that would not be visible in the above chart.

            Is there any way (through plugin or setting) I can make Firefox display aggregated flame charts for the selected time slice instead of time-based ones?

            ...

            ANSWER

            Answered 2018-Feb-01 at 19:55

            It seems that extending the DevTools is fairly limited, unless you're creating your own panel, but you don't really have access to the profiler in there to generate your Flame Graph.

            You can still save your recorded profile into a JSON file, parse it, and create your own Flame Graph that can calculate total aggregated runtime.

            You can also try the Gecko Profiler Add-on for some more advanced profiling. You'll be in the same boat though, in that you'd need to export it to do your own aggregations on the profile data.

            Source https://stackoverflow.com/questions/48459984

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

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            Install flamegraph

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