OpenJDK-8: Crypto performance is very slow on ARMv7

[Xerxes Rånby]

Hi Srinivasa


The yocto meta-java OpenJDK 8 recipe need to be updated to use the 
aarch32-port / jdk8u / hotspot sources that contains the aarch32 C1 JIT 
port contributed by AZUL systems.

http://hg.openjdk.java.net/aarch32-port/jdk8u/hotspot/


Quick summary of the updates that needs to be done:

First meta-java need to use the url pointing to the aarch32-port set 
into the  OPENJDK_HG_URL  "metadata" when building for ARM,

According to the "BitBake" manual it is possible to have "Conditional 
metadata" in the recipes depending on the architecture,

Example the line below should work as long as arm is added to OVERRIDES.

|OPENJDK_HG_URL_arm = 
"http://hg.openjdk.java.net/aarch32-port/${OPENJDK_HG_U}"|


A further discussion on how to do these updates to let the 
yocto/openembedded meta-java build infrastructure cross compile openjdk 
8 can only be solved by collaborating with the meta-java maintainers.

Patches and public discussion  should be sent to the openembedded-devel 
mailinglist.

You can get contact information to the meta-java maintainers and 
mailinglist here:

https://layers.openembedded.org/layerindex/branch/master/layer/meta-java/


Cheers

Xerxes


Den 2017-01-30 kl. 11:48, skrev Srinivasa Rao Ragolu:
> Hi Andrew,
>
> But hotspot module gives lot of compilation issues . So below statements
> are added to recipe (
> http://git.yoctoproject.org/cgit/cgit.cgi/meta-java/tree/recipes-core/openjdk/openjdk-8-release-102b14.inc
> )
>
> # Enable zero mode for arm based builds, as normal hotspot fails to build
> PACKAGECONFIG_append_arm = " zero"
> Any clue on, how to proceed further? Thanks in advance, Srinivas.
>
>
>
> On Mon, Jan 30, 2017 at 3:45 PM, Andrew Haley <aph at redhat.com> wrote:
>
>> On 30/01/17 07:02, Srinivasa Rao Ragolu wrote:
>>> Any other inputs that I could improve crypto performance?
>> Yes.  Don't use zero.  Zero is slow.
>>
>> Andrew.
>>
>>