It’s used in Google Chrome, Chromium, Node.js, and io.js.
Webstorm php intellisense code#
V8 has a built-in sampling CPU profiler, which provides information about the execution of your code and the behavior of the JavaScript engine itself: garbage collection cycles, compilation and re-compilation, and code optimization. Node.js CPU profiling in WebStorm is built around the V8 profiler. What is really important is that you need to consider the method of gathering profiling information. This method does not guarantee very good accuracy: snapshots happen to be taken at random moments, the term “random” in this context meaning “independent from the application execution.” Sampling profilers periodically record stack traces of your application. The recorded information does not provide us with the whole picture of what happened during execution, it does not contain all called functions, and it can even distort the relative quantities of function calls.
Sampling profilers can not say how many times a function was called. However, statistically this method gives results that are good enough to judge about hot spots. It is technically possible to run Node.js applications with profiling on remote machines, and work with resulting log files. This can be useful for stress testing of your application. To do it, start your Node.js application with the following flags:Īfter the execution, open the v8.log file in WebStorm by choosing Tools | V8 Profiling | Analyze V8 Profiling Log on the main menu. You can find more information on running the internal profiler from the command line in the V8 wiki or in this article from Chromium “For Developers” section. Open a previously recorded Node.js profiling log.Run a Node.js application from WebStorm with CPU profiling.Īfter application execution is over, the CPU profile view is opened.To put in two words, use can use CPU profiling with the following scenarios: Here you are: Diving into the feature details It all may sound too complicated, but don’t panic! WebStorm tries to simplify the inner details for the developer: you just run the application and see the hot spots. When using scenario 1, one or several log files are created by the V8 engine. Open a log file recorded by Chrome or Chromium (run with profiling flags).You can always open them again later.Īlso, you can record V8 profiling log on another environment (see section about Remote Profiling). To open a log file, choose Tools | V8 Profiling | Analyze V8 Profiling Log on the main menu.
Running Node.js application under profiler The parameters in the dialog are the same as in the Run Configuration described below.
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