Thanks for sharing the details of technology. Maybe it is also really hard to return a kind of serializable compiled code and let the embedder to handle(e.g. store) it. I just thought about that if the "installation" process can do more. (For example if windows wanna run their applications on lots of devices based on X86/ARM/MIPS, I think a reasonable way is that do the back-end compiling works and linkings when installing.)
On Tue, Jan 27, 2015 at 5:54 PM, Jakob Kummerow <jkumme...@chromium.org> wrote: > It's complicated. > > V8 has a so-called "snapshotting" mechanism which is used to speed up > startup. Recently people have been working on using it to cache other code > as well. > > That said, this is no silver bullet, as there are a number of inherent > challenges: > - dynamic languages like JavaScript are not well-suited for ahead-of-time > compilation > - generating optimized code depends on having collected type feedback, so > it can't happen up front; it also by definition bakes in a number of > non-cacheable assumptions > - generating non-optimized code, on the other hand, is relatively fast > anyway (unless there's a huge amount of it), so caching it only helps so > much > - assuming you have a working caching mechanism, you need reasonable rules > when to use it, how much disk space you're giving it, how you're making > sure it isn't stale, and so on. > - caching generated code doesn't affect sustained performance (possibly on > the contrary), it can only improve startup time. > > So having an explicit and time-consuming "installation"/pre-compilation > phase for JS packages isn't going to happen. However, more automatic > caching under the hood is something you're likely to see in the future > (regardless of where scripts came from -- there's no reason this couldn't > work with regular scripts found on web sites.) > > > On Tue, Jan 27, 2015 at 3:33 AM, Jiang Kelvin <leiyi...@gmail.com> wrote: > >> Not all js files are online, such as the js files in >> extensions/web-apps/application-cache. If we can save the result of >> compilation when installing or upgrading them, and just load and run the >> binary codes when calling a js function(think about the ART of Android), is >> it possible to improve performance? >> >> -- >> -- >> v8-users mailing list >> v8-users@googlegroups.com >> http://groups.google.com/group/v8-users >> --- >> You received this message because you are subscribed to the Google Groups >> "v8-users" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to v8-users+unsubscr...@googlegroups.com. >> For more options, visit https://groups.google.com/d/optout. >> > > -- > -- > v8-users mailing list > v8-users@googlegroups.com > http://groups.google.com/group/v8-users > --- > You received this message because you are subscribed to a topic in the > Google Groups "v8-users" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/v8-users/2Gjwvzhjs0Q/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > v8-users+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > -- -- v8-users mailing list v8-users@googlegroups.com http://groups.google.com/group/v8-users --- You received this message because you are subscribed to the Google Groups "v8-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to v8-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
