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From Fabian Lange <fabian.la...@codecentric.de>
Subject Re: Removal of JaxBUtil ?
Date Wed, 09 Aug 2017 08:46:24 GMT
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.lange@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 <gnodet@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.lange@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: gnodet@redhat.com
>> Web: http://fusesource.com
>> Blog: http://gnodet.blogspot.com/
>>
>
>

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