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Re: [MelbJVM] JVM experiences on ARM

From: Kon S.
Sent on: Friday, February 14, 2014 12:41 PM
Toby,

I would take a look at Java 8.  You can get ARM downloads from here.

http://jdk8.java.net/download.html

Thats the release candidate now (as of build 125)

See how you'd go, Oracle have done a bit of work with ARM and the people behind raspberry pi as of late.

Linux ARMv6/7 VFP, 
HardFP ABI

Let us know how you go


-- 
Kon Soulianidis
Sent with Sparrow

ps to anyone having trouble replying to this post, we're looking at an alternative messaging platform.  Just keep posting and I'll approve the messages ASAP.

On Friday, 14 February 2014 at 12:17 pm, Gordon Oliver wrote:

Hi Tony, i’ve been looking at this and this link to java hardware acceleration might be of interest.


I’m not sure how fast Jazelle hardware is, but worth a look.  Unfortunately I think its a licensing adventure.

It seems if you see an Arm core with a “j” in the name, like arm 926ej-s, its supped to have Jazelle support.

-- 
Gordon Oliver
Sent with Airmail

On 14 February 2014 at 11:38:31 am, Toby Corkindale ([address removed]) wrote:

Hi,

I've only had limited experience of using the JVM on ARM-based machines - just playing around on the raspberry pi, beaglebone, and just recently, the radxa rock.

They all were running the 'armhf' ABI for Linux, and at the times I checked, the only JREs available were based on openjdk - I couldn't get the oracle jre to work. (But this may have changed by now)

I've tried using the default "Zero" VM, as well as JamVM and Avian. JamVM was always the fastest to start up, but I think it's an interpreted-only VM, so it ended up being slower in the long run. Zero always ended up with the best performance.

But by "best" I mean.. least atrocious. The only ARM platform that was usable, out of the ones I listed above, was the Radxa Rock - probably because it's a quad-core 1.6 ghz board. Running anything on the Pi was an exercise in patience.

But I confess I don't have much knowledge of the best way to make this work.
Can anyone else offer advice on getting decent performance from the jvm on arm?

Is the Oracle JRE really worth the effort to get setup?

Thanks,
Toby




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