Is there a JDK with a JIT compiler available?

Question 1

OpenJDK compiles and runs on the Pi successfully, but the only version I've found is one without a JIT. Oracle provides such a JDK for other versions of ARM, but not ARMv6. Is there any way to get such a version of the JDK up and running in the meantime?

Question 2

What's the distro?

Question 3

Debian squeeze at present, though I'm not overly fussed about changing if this would help the situation!

Question 4

Can you not install the OpenJDK version in the official repo?

Question 5

@Jivings Yup, that's what I'm using at the moment. But that version doesn't come with a JIT (hence the question!)

Question 6

@Jivings If I had to guess, I'd say it's not a trivial task to create a JIT because the optimisations are potentially somewhat different for each platform / architecture. But that's just a guess :-)

Question 7

Oracle have now released (as of Java 7u6) a JDK with JIT that works on the Pi with full AWT / Swing support. It also supports JVMTI (cacao only has partial support.) Press release here.

I've verified it works with Greenfoot, and provides a huge speedup compared to the likes of a plain (non-JIT) OpenJDK build.

(削除) At the time of writing it doesn't support hard floating point, and so won't work with distributions like Raspbian that only use hard float - this is however planned for a future release. (削除ここまで)

UPDATE: As Darren pointed out, a hard float version has now been released for ARM in the form of a JDK8 preview release, you can find it here.

UPDATE 2: Hard float is now supported in JDK7.

Question 8

Which distributions does it support?

Question 9

@Zoot I've used it with Debian squeeze fine - it should support any Linux distribution that can use softfloat.

Question 10

The icedtea-6-jre-cacao package contains a JIT compiler, and reportedly works on the RasPi.

I have not tried it myself.

Question 11

Is that not just the JRE rather than the JDK though?

Question 12

@berry120: It is in the JRE that the JIT is needed. It should not matter whether a JIT was in use when the program was compiled.

Question 13

Ah, good point. Will give it a try :-)

Question 14

The cacao JIT doesn't seem to work properly, at least on Raspbian, and there doesn't seem to be an easy fix.

Question 15

Oracle have now released a developer preview of Java JDK8 for ARM which specifically includes support for hard-float Raspbian on the Pi. It works, and I have found it to be around 20 times faster than OpenJDK for certain floating point intensive computations. http://jdk8.java.net/fxarmpreview/

Question 16

You beat me to it! I was just about to post that :-)

Question 17

On Rasbian you can use JamVM that includes a "code-copying-JIT"

apt-get install icedtea-7-jre-jamvm

JamVM is currently the fastest and most stable JVM that include a JIT on Rasbian.

Avian is also supported on Rasbian that also includes a JIT. You will have to build it manually: http://labb.zafena.se/?p=630

I expect Avian to appear in Raspbian when it have been built from Debian SID source. Avian currently exist in Debian SID experimental inside the jvm-7-avian-jre package.

Both Avian and JamVM work in combination with the OpenJDK-7 classes so you can use them both to speeding up all java launchers such as javac and java. the file /etc/java-7-openjdk/jvm-armhf.cfg determine which JVM gets used by default inside openjdk 7 on Rasbian.

You can also tell the java launchers individually which jvm to use:

java -jamvm
javac -J-jamvm

Question 18

Oracle released the full Version (no longer preview) of Java 8 and Java 7 for the ARM architecture of the Raspberry Pi: link to Java 8.

You can also use from the command line:

sudo apt-get update
sudo apt-get install oracle-java8-jdk

Question 19

It is possible to combine OpenJDK 7 with the JVM from Java JDK8 that includes a JIT to get a setup with X11 supported and Swing/AWT working.

The JNI interface, with "Classpath" exception, clearly separate the JVM and the runtime environment classes. If you use the Client Hotspot (jre/lib/arm/client/libjvm.so) from the JavaFX 8 preview in combination with the Rasbian compiled OpenJDK 7 Runtime environment classes and java launchers (/usr/lib/jvm/java-7-openjdk-armhf) you will get the following setup and benefits:

Hotspot Client JIT (from the JavaFX 8 preview)
Swing/AWT support (using the OpenJDK classes from the openjdk-7-jre package)
pulse-audio support (IcedTea pulse-java from the openjdk-7-jre and openjdk-7-jre-headless package)
web-browser applet support using icedtea-web (from the icedtea-7-plugin package)
a JNLP javaws launcher using icedtea-web (from the icedtea-7-plugin package)
armhf JNI autodetection by the OpenJDK java launchers (the OpenJDK java launchers adds the armhf specific system library path into java.library.path). By including the /usr/lib/arm-linux-gnueabihf path into java.library.path allows java libraries such as the Pi4J GPIO library and the JogAmp gluegen-rt JOGL/JOAL to correctly detect that it is running on a armhf linux system and then load the armhf JNI implementation instead of the armel JNI implementation.
Image processing and printing support inside JavaEE server applications, such as glassfish and tomcat, by using the headfull OpenJDK classes.

Setup:

Download jdk-8-ea-b36e-linux-arm-hflt-29_nov_2012.tar.gz from http://jdk8.java.net/fxarmpreview/index.html

# Install openjdk-7 and the icedtea-web browser plugin
sudo apt-get install openjdk-7-jdk icedtea-7-plugin
# Extract the Oracle Client Hotspot JVM from the JavaFX 8 preview
tar --extract --verbose --file=jdk-8-ea-b36e-linux-arm-hflt-29_nov_2012.tar.gz jdk1.8.0/jre/lib/arm/client
# Place the client hotspot dir containing the libjvm.so inside the OpenJDK 7 jre/lib/arm folder
sudo mv jdk1.8.0/jre/lib/arm/client /usr/lib/jvm/java-7-openjdk-armhf/jre/lib/arm/oracle
# Configure the OpenJDK Runtime to use the Oracle client Hotspot JVM dir
# This sed command places -oracle KNOWN at the first line of jvm-armhf.cfg
sudo sed -i -e "1i\\-oracle KNOWN" /etc/java-7-openjdk/jvm-armhf.cfg
java -version
java version "1.7.0_07" <--- This is the OpenJDK 7 Update version
OpenJDK Runtime Environment (IcedTea7 2.3.2) (7u7-2.3.2a-1+rpi1) <--- This is the OpenJDK 7 Runtime version
Java HotSpot(TM) Client VM (build 25.0-b04, mixed mode) <--- This is the Oracle Client Hotspot JVM version

berry120 berry120 11k11 gold badges53 silver badges63 bronze badges · Answer 1 · 2012-08-16 14:31:18Z

Oracle have now released (as of Java 7u6) a JDK with JIT that works on the Pi with full AWT / Swing support. It also supports JVMTI (cacao only has partial support.) Press release here.

I've verified it works with Greenfoot, and provides a huge speedup compared to the likes of a plain (non-JIT) OpenJDK build.

(削除) At the time of writing it doesn't support hard floating point, and so won't work with distributions like Raspbian that only use hard float - this is however planned for a future release. (削除ここまで)

UPDATE: As Darren pointed out, a hard float version has now been released for ARM in the form of a JDK8 preview release, you can find it here.

UPDATE 2: Hard float is now supported in JDK7.

@Zoot I've used it with Debian squeeze fine - it should support any Linux distribution that can use softfloat.

finnw finnw 5,7903 gold badges34 silver badges42 bronze badges · Answer 2 · 2012-06-14 18:43:58Z

7

The icedtea-6-jre-cacao package contains a JIT compiler, and reportedly works on the RasPi.

I have not tried it myself.

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answered Jun 14, 2012 at 18:43

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finnw finnw

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4

Is that not just the JRE rather than the JDK though?

berry120
– berry120

2012年06月14日 23:16:57 +00:00
Commented Jun 14, 2012 at 23:16
1

@berry120: It is in the JRE that the JIT is needed. It should not matter whether a JIT was in use when the program was compiled.

finnw
– finnw

2012年06月14日 23:18:17 +00:00
Commented Jun 14, 2012 at 23:18
Ah, good point. Will give it a try :-)

berry120
– berry120

2012年06月14日 23:18:45 +00:00
Commented Jun 14, 2012 at 23:18
2

The cacao JIT doesn't seem to work properly, at least on Raspbian, and there doesn't seem to be an easy fix.

Darren Wilkinson
– Darren Wilkinson

2012年07月24日 19:18:27 +00:00
Commented Jul 24, 2012 at 19:18

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score 5 · Answer 3 · 2012-12-20 09:17:33Z

Oracle have now released a developer preview of Java JDK8 for ARM which specifically includes support for hard-float Raspbian on the Pi. It works, and I have found it to be around 20 times faster than OpenJDK for certain floating point intensive computations. http://jdk8.java.net/fxarmpreview/

You beat me to it! I was just about to post that :-)

berry120
– berry120

2012年12月20日 13:51:01 +00:00
Commented Dec 20, 2012 at 13:51

Xerxes Rånby Xerxes Rånby 411 bronze badge · Answer 4 · 2012-10-27 09:55:15Z

On Rasbian you can use JamVM that includes a "code-copying-JIT"

apt-get install icedtea-7-jre-jamvm

JamVM is currently the fastest and most stable JVM that include a JIT on Rasbian.

Avian is also supported on Rasbian that also includes a JIT. You will have to build it manually: http://labb.zafena.se/?p=630

I expect Avian to appear in Raspbian when it have been built from Debian SID source. Avian currently exist in Debian SID experimental inside the jvm-7-avian-jre package.

Both Avian and JamVM work in combination with the OpenJDK-7 classes so you can use them both to speeding up all java launchers such as javac and java. the file /etc/java-7-openjdk/jvm-armhf.cfg determine which JVM gets used by default inside openjdk 7 on Rasbian.

You can also tell the java launchers individually which jvm to use:

java -jamvm
javac -J-jamvm

Simulant Simulant 6511 gold badge9 silver badges22 bronze badges · Answer 5 · 2014-05-22 09:36:40Z

Oracle released the full Version (no longer preview) of Java 8 and Java 7 for the ARM architecture of the Raspberry Pi: link to Java 8.

You can also use from the command line:

sudo apt-get update
sudo apt-get install oracle-java8-jdk

xranby xranby 3612 silver badges4 bronze badges · Answer 6 · 2012-12-21 18:29:33Z

It is possible to combine OpenJDK 7 with the JVM from Java JDK8 that includes a JIT to get a setup with X11 supported and Swing/AWT working.

The JNI interface, with "Classpath" exception, clearly separate the JVM and the runtime environment classes. If you use the Client Hotspot (jre/lib/arm/client/libjvm.so) from the JavaFX 8 preview in combination with the Rasbian compiled OpenJDK 7 Runtime environment classes and java launchers (/usr/lib/jvm/java-7-openjdk-armhf) you will get the following setup and benefits:

Hotspot Client JIT (from the JavaFX 8 preview)
Swing/AWT support (using the OpenJDK classes from the openjdk-7-jre package)
pulse-audio support (IcedTea pulse-java from the openjdk-7-jre and openjdk-7-jre-headless package)
web-browser applet support using icedtea-web (from the icedtea-7-plugin package)
a JNLP javaws launcher using icedtea-web (from the icedtea-7-plugin package)
armhf JNI autodetection by the OpenJDK java launchers (the OpenJDK java launchers adds the armhf specific system library path into java.library.path). By including the /usr/lib/arm-linux-gnueabihf path into java.library.path allows java libraries such as the Pi4J GPIO library and the JogAmp gluegen-rt JOGL/JOAL to correctly detect that it is running on a armhf linux system and then load the armhf JNI implementation instead of the armel JNI implementation.
Image processing and printing support inside JavaEE server applications, such as glassfish and tomcat, by using the headfull OpenJDK classes.

Setup:

Download jdk-8-ea-b36e-linux-arm-hflt-29_nov_2012.tar.gz from http://jdk8.java.net/fxarmpreview/index.html

# Install openjdk-7 and the icedtea-web browser plugin
sudo apt-get install openjdk-7-jdk icedtea-7-plugin
# Extract the Oracle Client Hotspot JVM from the JavaFX 8 preview
tar --extract --verbose --file=jdk-8-ea-b36e-linux-arm-hflt-29_nov_2012.tar.gz jdk1.8.0/jre/lib/arm/client
# Place the client hotspot dir containing the libjvm.so inside the OpenJDK 7 jre/lib/arm folder
sudo mv jdk1.8.0/jre/lib/arm/client /usr/lib/jvm/java-7-openjdk-armhf/jre/lib/arm/oracle
# Configure the OpenJDK Runtime to use the Oracle client Hotspot JVM dir
# This sed command places -oracle KNOWN at the first line of jvm-armhf.cfg
sudo sed -i -e "1i\\-oracle KNOWN" /etc/java-7-openjdk/jvm-armhf.cfg
java -version
java version "1.7.0_07" <--- This is the OpenJDK 7 Update version
OpenJDK Runtime Environment (IcedTea7 2.3.2) (7u7-2.3.2a-1+rpi1) <--- This is the OpenJDK 7 Runtime version
Java HotSpot(TM) Client VM (build 25.0-b04, mixed mode) <--- This is the Oracle Client Hotspot JVM version

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