Why does the compiled size increase from 8 to 9? That would seem to indicate a bug with the optimizer in that step.
On Thu, Sep 23, 2010 at 3:41 PM, Eric Ayers <[email protected]> wrote: > The attached graph shows an analysis of code size to compile time for > building a large application. The code size is the total number of bytes > output for .cache.js files for all permutations added together. > > Somewhere between passes 2 to 4 is a "sweet spot", where further > optimization passes appear to be returning only marginal improvements. At > 3 optimization passes, Another way to verify that besides just the code > size metric is to look at the statistics I added in a week ago that show how > much the tree changes on each pass. When we looked at the same application, > Changes were measured in the thousands on the first pass or two, then > trickled down into the tens in later passes. > > Previously, I had another implementation of this feature where the > DataflowOptimizer and SameParameterValueOptimizer were automatically turned > off until level 6 or higher (you can flip these off with a separate command > line flag). In that case, code size was nearly the same, and compile time > was 220 seconds at optimization level 3. > > full optimization: 300s > 3 passes only: 250s > 3 passes - aggressive optimizations: 220s > > -Eric. > > On Thu, Sep 23, 2010 at 3:32 PM, <[email protected]> wrote: > >> Reviewers: scottb, fabbott, Lex, >> >> Description: >> Adds a way to tune the optimization level in steps from >> draft optimize to full optimization (the current default) >> >> Preliminary testing shows that optimization level '3' >> can give almost as good code size results (within 5%) >> as full optimization, with about 20% reduction in compile time. >> >> >> Please review this at http://gwt-code-reviews.appspot.com/915802/show >> >> Affected files: >> M dev/core/src/com/google/gwt/dev/Precompile.java >> M dev/core/src/com/google/gwt/dev/jjs/JJSOptions.java >> M dev/core/src/com/google/gwt/dev/jjs/JJSOptionsImpl.java >> M dev/core/src/com/google/gwt/dev/jjs/JavaToJavaScriptCompiler.java >> M dev/core/src/com/google/gwt/dev/util/arg/ArgHandlerDraftCompile.java >> A dev/core/src/com/google/gwt/dev/util/arg/ArgHandlerOptimize.java >> D dev/core/src/com/google/gwt/dev/util/arg/OptionDraftCompile.java >> A dev/core/src/com/google/gwt/dev/util/arg/OptionOptimize.java >> >> >> > > > -- > Eric Z. Ayers > Google Web Toolkit, Atlanta, GA USA > > -- > http://groups.google.com/group/Google-Web-Toolkit-Contributors > -- http://groups.google.com/group/Google-Web-Toolkit-Contributors
