On: ARM server market

[needusername]

Oracle JDK has full support for C2 and hard float on ARM 64. That code is not in OpenJDK. Red Hat is working on C1 in OpenJDK for Java 9.

[enevill → needusername]

Full support for C1 & C2 is available in OpenJDK 7,8 & 9. Prebuilt binaries may be downloaded from http://openjdk.linaro.org/releases.htm. Sources are upstreamed for jdk9 (http://hg.openjdk.java.net/jdk9/dev). For jdk8 they are maintained in the OpenJDK aarch64 project (http://hg.openjdk.java.net/aarch64-port/jdk8). For jdk7 they are maintained in the IcedTea project (http://icedtea.classpath.org/hg/icedtea7-forest).

The default java on Ubuntu trusty (14.04) and vivid (15.04) LTS releases is openjdk. From my 48 core aarch64 platform running trusty.

ed@arm64:~/jdk8/jdk8$ cat /etc/lsb-release DISTRIB_ID=Ubuntu DISTRIB_RELEASE=14.04 DISTRIB_CODENAME=trusty DISTRIB_DESCRIPTION="Ubuntu Trusty Tahr (development branch)" ed@arm64:~/jdk8/jdk8$ uname -a Linux arm64 3.18.0-g57fcd51 #1 SMP Fri Jun 26 17:33:54 PDT 2015 aarch64 aarch64 aarch64 GNU/Linux ed@arm64:~/jdk8/jdk8$ java -version java version "1.7.0_51" OpenJDK Runtime Environment (IcedTea 2.4.6) (7u51-2.4.6-1ubuntu4) OpenJDK 64-Bit Server VM (build 25.0-b70, mixed mode) ed@arm64:~/jdk8/jdk8$

OpenJDK is also the default java on RHEL and fedora.

[the_why_of_y → needusername]

There was a talk about the port last year, with slides:

https://archive.fosdem.org/2014/schedule/event/openjdk_aarch...