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

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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
arm? If serriously, i will try. ty

> 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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