I'm working on an experiment that uses EventListener instances to handle a large number of events. I've noticed there is quite a bit of overhead when invoking a Javascript-based event listener.
I'm not sure there is a lot that can be done about it. I've looked through the implementation of how the Javascript function gets evaluated. The only question I have right now is whether the event handler function from Javascript is JIT compiled. I'm not sure that really matters. It seems to be the invocation which causes the most cost. If I attach an empty function for the event, the processing slows down (i.e. the cost is incurred regardless of what is going on inside the function). It just seems like the cost of crossing the language boundary between C++ and Javascript is quite expensive. I've only tried this with JavascriptCore. I've not looked into bindings for v8 as of yet. Thoughts on this? -- --Alex Milowski "The excellence of grammar as a guide is proportional to the paucity of the inflexions, i.e. to the degree of analysis effected by the language considered." Bertrand Russell in a footnote of Principles of Mathematics _______________________________________________ webkit-dev mailing list webkit-dev@lists.webkit.org http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev
