On 27-01-2010, Collin Winter wrote: > Hi William, > > On Wed, Jan 27, 2010 at 7:26 AM, William Dode <w...@flibuste.net> wrote: >> Hi (as a simple user), >> >> I'd like to know why you didn't followed the same way as V8 Javascript, >> or the opposite, why for V8 they didn't choose llvm ? >> >> I imagine that startup time and memory was also critical for V8. > > Startup time and memory usage are arguably *more* critical for a > Javascript implementation, since if you only spend a few milliseconds > executing Javascript code, but your engine takes 10-20ms to startup, > then you've lost. Also, a minimized memory profile is important if you > plan to embed your JS engine on a mobile platform, for example, or you > need to run in a heavily-multiprocessed browser on low-memory consumer > desktops and netbooks. > > Among other reasons we chose LLVM, we didn't want to write code > generators for each platform we were targeting. LLVM has done this for > us. V8, on the other hand, has to implement a new code generator for > each new platform they want to target. This is non-trivial work: it > takes a long time, has a lot of finicky details, and it greatly > increases the maintenance burden on the team. We felt that requiring > python-dev to understand code generation on multiple platforms was a > distraction from what python-dev is trying to do -- develop Python. V8 > still doesn't have x86-64 code generation working on Windows > (http://code.google.com/p/v8/issues/detail?id=330), so I wouldn't > underestimate the time required for that kind of project.
Thanks for this answer. The startup time and memory comsumption are a limitation of llvm that their developers plan to resolve or is it only specific to the current python integration ? I mean the work to correct this is more on U-S or on llvm ? thanks (and sorry for my english !) -- William Dodé - http://flibuste.net Informaticien Indépendant _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
