Multiple versions of Chrome. Why Garbage Collection? Chapter 9 of Inside the Java Virtual MachineGarbage Collectionby Bill Venners The Java virtual machine's heap stores all objects created by a running Java application.
Objects are created by the new, newarray, anewarray, and multianewarray instructions, but never freed explicitly by the code. Garbage collection is the process of automatically freeing objects that are no longer referenced by the program. This chapter does not describe an official Java garbage-collected heap, because none exists. As mentioned in earlier chapters, the Java virtual machine specification does not require any particular garbage collection technique. Accompanying this chapter on the CD-ROM is an applet that interactively illustrates the material presented in the chapter. The name "garbage collection" implies that objects no longer needed by the program are "garbage" and can be thrown away. In addition to freeing unreferenced objects, a garbage collector may also combat heap fragmentation. Figure 9-1. Garbage Collection. Chrome Developer Tools. Command Line API. From FirebugWiki The Firebug Command Line provides these special functions for your convenience.
These include functions to control the Firebug UI, functions interacting with the page, shortcuts for selectors and shortcuts for the Console API. Other browsers implement the Command Line API as well; the Chrome DevTools, Safari Inspector and Opera Dragonfly, implement most of what is below.  help Returns a list of Command Line API commands including short descriptions.  $(selector) Returns a single element matching the given CSS selector.
There are two ways to run a profile: 1) Manually The pane itself has a little button in the lower left-hand corner which can be used to start and stop a profile. 2) Programmatically The way I suggest you invoke profile runs is by calling into the console directly from your code. Focus. Understanding Heap Profiler. On Thu, Jan 27, 2011 at 06:20, C Snover <goo...
@zetafleet.com> wrote:> Hi Mikhail,>> Thanks very much for your help. Bear with me, as I have a couple of> follow-ups, below. (Also, I accidentally replied directly to you> instead of to the list; sorry about that.) >> On Jan 24, 4:41 am, Mikhail Naganov <mnaga... @chromium.org> wrote:>> (roots) are GC roots -- current stack, active V8 handle scopes,>> compilation cache, global handles. >> So, could these be likened to references to objects from within the> engine itself? > Not sure what do you mean by the "references ... from within theengine".
>> (global property) are special intermediate objects that stand between>> a global object (e.g. window) and an object that is referenced from>> it. >> Why is this done? For performance. Google Chrome's Heap Profiler and Memory Timeline. (with thanks to Mikhail Naganov for his feedback on the Developer Tools mailing list) Chrome’s Developer Tools contain some useful features for inspecting memory usage of a given page (and its change over time), but the documentation for these features is a bit sparse—and, if you are unfamiliar with these sorts of tools and what they do, their output can seem undecipherable.
Hopefully this brief post helps explain these features and what they can do for you. The Memory Timeline The memory timeline gives you an overview of memory usage over time. This makes it very easy to see how much memory various parts of your application use and can provide a strong visual cue if your application is leaking memory over time. 12 Tricks to Develop Quicker.