Hey, I have new intel on this. A colleague generated a flame graph. I cannot share the raw svg unfortunately, but I cropped the Feature JAXB parsing.
It is about 25% of the overall startup time just to boot up the jaxb infrastructure. Fabian On Fri, Jul 22, 2016 at 10:06 AM, Fabian Lange <fabian.la...@codecentric.de> wrote: > Thanks, good hint. > For those inclined to understand my request, attached is the output of > -XX:+TraceClassLoading > > Using the xml binding feature approximately loads 800 classes (which > represent about 5MB memory) > > I haven't checked alternatives to the jaxb. And I am aware that this is a > more esoteric requirement to reduce footprint. > > However, I am sure if this would not be from the JDK, nobody would pull in > a 5MB dependency to parse a single xml file. > > Fabian > > > On Fri, Jul 22, 2016 at 9:25 AM, Guillaume Nodet <gno...@apache.org> > wrote: > >> Note that on older branches, the feature repositories are still parsed >> using DOM >> https://github.com/apache/karaf/blob/karaf-2.x/features/ >> core/src/main/java/org/apache/karaf/features/internal/RepositoryImpl.java >> >> The xml is now also written, that may be the reason why we switched. >> >> 2016-07-14 23:11 GMT+02:00 Fabian Lange <fabian.la...@codecentric.de>: >> >> > Hi, >> > >> > i am looking into ways to trim down Karaf. I notices that Karaf uses >> JaxB >> > to parse features.xml - However this is the only application of JaxB. >> > >> > Could somebody more involved help me to figure out if it is worth to >> > replace it with manual marshalling? I assume other xmls are parsed >> > differently? >> > Advantage would be that the whole jaxb infrastructure could be avoided, >> > including the contexts. >> > >> > I know manual parsing is a pain, but anyway, just wanted to throw this >> out, >> > maybe somebody has a good suggestion. >> > >> > Fabian >> > -- >> > Fabian Lange | Performance Expert >> > mobil: +49 (0) 160.3673393 >> > >> > codecentric AG | Merscheider Straße 1 | 42699 Solingen | Deutschland >> > >> > Sitz der Gesellschaft: Solingen | HRB 25917| Amtsgericht Wuppertal >> > Vorstand: Michael Hochgürtel . Mirko Novakovic . Rainer Vehns >> > Aufsichtsrat: Patric Fedlmeier (Vorsitzender) . Klaus Jäger . Jürgen >> Schütz >> > >> >> >> >> -- >> ------------------------ >> Guillaume Nodet >> ------------------------ >> Red Hat, Open Source Integration >> >> Email: gno...@redhat.com >> Web: http://fusesource.com >> Blog: http://gnodet.blogspot.com/ >> > >
