On Thu, Feb 17, 2011 at 4:51 PM, Jochen Theodorou <[email protected]> wrote: > Am 17.02.2011 15:55, schrieb Rémi Forax: > [...] >> >> It only works for the JDK :( >> >> http://download.oracle.com/javase/6/docs/technotes/guides/vm/class-data-sharing.html > > you mean only for the rt.jar and maybe other internal jars. > > So it is not usable for us language guys... For many languages it would be > very good to be able to make some kind of root image that can be used. > Basically that is what the fork for the JVM is intending to do as well. > Something like that is really badly needed I think
I agree, and I'd like to add that memory mapping the classes is only a partial solution; the optimum would be to also save live object instances (perhaps starting from selected roots), since I suspect that for many languages a significant part of the loading time is spent establishing the initial state of the language runtime (at least this is true for ABCL [1]). Doing this in general is not easy at all (what about open file descriptors, running threads, and all similarly non-persistent resources?), and I don't see compelling reasons for Oracle to embark in such an effort (given that the JVM is prevalently used in server environments where cold restarts are rare). Still, save-image is supported by all major Lisp implementations (and Smalltalk, I believe), and used to minimize startup times and deliver self-contained executables. [1] http://common-lisp.net/project/armedbear/ Cheers, Alessio -- You received this message because you are subscribed to the Google Groups "JVM Languages" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/jvm-languages?hl=en.
