Hi, On Wednesday, May 13, 2009, Jeremy Orlow <[email protected]> wrote: > On Wed, May 13, 2009 at 1:11 AM, Maciej Stachowiak <[email protected]> wrote: > > > On May 13, 2009, at 12:18 AM, Meryl Silverburgh wrote: > > > Hi, > > Does webkit cache squirrelfish bytecode? For example, multiple can use > the same javascript file (e.g. common javascript libraries, like > jquery, or same domain uses some common javascript file across > different pages for the same domain). > > When webkit parses the JS file and builds squirrelfish-bytecode, does > it cache it ? so that subsequence loading of the same js file will > skip the js compile process? > > > > We don't currently cache the bytecode (or the native code). It is an option > we have considered, however, currently, code generation is a trivial portion > of JS execution time (< 2%), so we're not pursuing this at the moment. > > > What does the < 2% number reflect? The percent of time while running a > particular benchmark or something? > I totally believe that the speed of runtime is not really affected by it, but > what about page load latency? Compile time is a non-trivial component of > load time for most JIT compilers I've heard of.
[Speaking from the point of view of my day job working on Mobile Gmail instead of occasional evening webkit hacker] Performance tests on mobile gmail for iPhone show that the time from loading the first few bytes of the page from AppCache to the completion of executing the "static" JavaScript (function and variable definitions) occupies a large portion of the application startup time. Somehow speeding this up (caching the parsed and compiled version of JavaScript stored in AppCache maybe?) would be a huge benefit to complex web applications. Rob. > > > > -- Rob Kroeger [email protected] http://www.liqui.org _______________________________________________ webkit-dev mailing list [email protected] http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev
