Re: huge java speedup on arm32 via java-1.8.0-openjdk-aarch32

[Jiri Vanek]

On 09/23/2016 10:10 PM, Roman wrote:
> В Чт, 22/09/2016 в 12:43 +0200, Jiri Vanek пишет:
> > Hello good people of Fedora!
> >
> > Most of you is probably facing very slow java (java-1.8.0-openjdk) on
> > any arm32 device.
> > The luckier from you already tuned arm32 boards to not need java at
> > all.
> >
> > But behold! The "new"[0] OpenJDK for arm32 crossed milestone when it
> > can be widely used.
> >
> > If you need java on your arm32 board, try to replace (or install
> > alongside) your java-1.8.0-openjdk
> > special package java-1.8.0-openjdk-aarch32
> > The theoretical speedup[1] is aprox 100x faster. Practical speedup is
>
> 100x speedup, and u think that there will be someone who use java on

I do :)
> arm? If serriously, i will try. ty

If nothing else does, koji builders are. And java stack is build for arms.

If no other benefit then 1/10 waiting for arm32 koji builds, then it fulfilled its purpose.

But I believe the package will have also human-target audience.

hth!
   J.
> > somewhere between 10x-50x (for
> > now). You can see it in koji:
> > http://koji.fedoraproject.org/koji/buildinfo?buildID=780150 - java
> > build by "normal" java on aarch32
> > 13 hours
> >
> > http://koji.fedoraproject.org/koji/buildinfo?buildID=802986  - java
> > build by "new" java on aarch32 -
> > 2 hours
> >
> > We have already slowly started to enable virtual java provides:
> > f24 - no
> > f25 - java
> > f26 - java+java-devel
> >
> > Please *don't* change your specfiles (if any) to something like:
> >
> > ifarch arm32
> >    BuildRequires java-1.8.0-openjdk-aarch32-devel
> > else
> >    BuildRequires java-1.8.0-openjdk-devel
> > fi
> >
> > You will mess up things a lot. The provides will come with stability
> > and  in longer run the package
> > will be merged back to java-1.8.0-openjdk packages (as it is still
> > the same friendly openjdk, just
> > with different virtual machine)
> >
> > hth
> >    J.
> >
> > [0] http://koji.fedoraproject.org/koji/packageinfo?packageID=22627
> > [1] http://mail.openjdk.java.net/pipermail/aarch32-port-dev/2016-Sept
> > ember/000440.html
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