karaf-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Jean-Baptiste Onofré ...@nanthrax.net>
Subject Re: Removal of JaxBUtil ?
Date Wed, 09 Aug 2017 08:53:20 GMT
Hi Fabian,

interesting fact indeed. What alternate do you propose ?

Regards
JB

On 08/09/2017 10:46 AM, Fabian Lange wrote:
> 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 
> <mailto: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
>     <mailto: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
>         <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
>         <mailto: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 <tel:%2B49%20%280%29%20160.3673393>
>          >
>          > 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 <mailto:gnodet@redhat.com>
>         Web: http://fusesource.com
>         Blog: http://gnodet.blogspot.com/
> 
> 
> 

-- 
Jean-Baptiste Onofré
jbonofre@apache.org
http://blog.nanthrax.net
Talend - http://www.talend.com

Mime
View raw message