I should add that these flags were mostly intended for development of v8 itself, and it is not necessarily easy to correlate the generated code with your javascript source. The --print-ast option can help with this.
Paul On Dec 8, 2010, at 9:43 PM, Paul Lind <[email protected]> wrote: > Hi Yehuda - > > The v8 shell has a lot of options for seeing the generated code. Build the > shell in debug mode: > > scons mode=debug sample=shell -jNN > > Then run your code with these options, as a start: > > shell_g --debug-code --print-code xxx.js > > Other useful opts are: --print-code-stubs --trace-codegen > > You can see all available opts with shell_g --help > > There are also a lot of code profiling options built in, which may be very > useful for you. > > v8 had major changes in the past day that will certainly affect performance, > you might way to pull the latest, if you are on ia32 arch. > > Hope this helps, > > Paul > > > > On Dec 8, 2010, at 7:57 PM, Yehuda Katz <[email protected]> wrote: > >> Are there flags in V8 that will print out information about the V8 >> optimization process. For instance, in Hotspot, I can ask Java to >> print out debugging information when a method gets compiled (-XX: >> +PrintCompilation +PrintAssembly +PrintInlining) to see what kinds of >> optimizations are happening. >> >> This can be used to find trouble spots in code, where Hotspot is >> intentionally not optimizing something that you might expect to get >> optimized. One example would be methods that are too large to get >> compiled in Hotspot. Are there similar or equivalent mechanisms in v8. >> I am interested in learning more about what optimizations are >> performed on different kinds of code in more detail. >> >> Thanks, >> >> -- Yehuda Katz >> -- SproutCore >> -- Strobe, Inc. >> >> -- >> v8-users mailing list >> [email protected] >> http://groups.google.com/group/v8-users > > -- > v8-users mailing list > [email protected] > http://groups.google.com/group/v8-users -- v8-users mailing list [email protected] http://groups.google.com/group/v8-users
