OpenJDK

OpenJDK JVM does not schedule threads on multiple cores

醉酒当歌 提交于 2020-01-02 04:48:07
问题 When I run my multi-threaded Java program on the OpenJDK 6 JVM that is distributed with Ubuntu 12.04, all threads are scheduled on a single core. But when I run the exact same program on the JVM from Oracle's latest 1.7 JDK, it nicely rotates my 20 threads around all 24 available cores. The OpenJDK documentation explains that Java threads will be assigned to native threads, but it doesn't seem to be working. Could there be something configured wrong in my OpenJDK installation, or does it not

How can I install openjdk-7-jdk on lucid 10.04 LTS? [closed]

纵然是瞬间 提交于 2020-01-02 00:52:23
问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 7 years ago . I'm currently using JDK 6 on a Ubuntu 10.04 LTS server. Since Oracle will not allow JDK 6 in Ubuntu repos now, it looks like OpenJDK 7 is the best alternative https://lists.ubuntu.com/archives/ubuntu-security-announce/2012-January/001554.html I noticed OpenJDK 7 available on 11.10 as a package, but is there a

Is it possible to compile java using Oracle JDK and run the code on OpenJDK?

╄→尐↘猪︶ㄣ 提交于 2020-01-01 08:46:35
问题 So is it possible to do all the development of a Java daemon (Apache Daemon) on a Windows 7 machine, then install the service on Ubuntu server (still have to search how to do that) which has OpenJDK installed ? If yes, how can I identify the compatible versions of Java on both systems ? I mean if I'm using Java 1.6 on windows, what is the least compatible OpenJDK version I should have on Ubuntu server ? 回答1: Mostly yes, but for corner cases it depends and should be carefully tested on stage

Ubuntu openJDK 配置

戏子无情 提交于 2019-12-30 12:36:08
sudo apt-get install openjdk-8-jdk sudo vim /etc/profile export JAVA_HOME=/usr/lib/jvm/jdk1.8.0_144 ## 这里要注意目录要换成自己解压的jdk 目录 export JRE_HOME=${JAVA_HOME}/jre export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib export PATH=${JAVA_HOME}/bin:$PATH source /etc/profile sudo update-alternatives –install /usr/bin/java java /usr/lib/jvm/jdk1.7.0_60/bin/java 300 sudo update-alternatives –config java sudo tar zxvf eclipse-cpp-oxygen-1a-linux-gtk-x86_64.tar.gz -C /opt 来源: https://www.cnblogs.com/ppCola/p/11161782.html

OpenJDK or Sun Java for IntelliJ IDEA [duplicate]

独自空忆成欢 提交于 2019-12-30 06:44:07
问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: Installing IDEA on Ubuntu 11.10 I have running IntelliJ IDEA with OpenJDK but at startup IntelliJ IDEA from terminal it shows me: $ ./idea.sh OpenJDK Runtime Environment (IcedTea6 1.11pre) (6b24~pre2-1) OpenJDK Server VM (build 20.0-b12, mixed mode) WARNING: You are launching IDE using OpenJDK Java runtime. THIS IS STRICTLY UNSUPPORTED DUE TO KNOWN PERFORMANCE AND GRAPHICS PROBLEMS! NOTE: If you have both Oracle

docker中安装jdk 1.8

微笑、不失礼 提交于 2019-12-29 22:55:45
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 1.在宿主系统下载所需要的jdk版本的gz文件 2.复制gz文件到容器中的root的用户目录下 docker cp <path to jdk gz file>/jdk-8u121-linux-x64.tar.gz <容器名称或者ID>:/root 3.进入容器 docker exec -it <容器名称或者ID> bash 4. 在容器中解开gz文件 cd ~ tar -zxvf jdk-8u121-linux-x64.tar.gz chown root:root ~/jdk1.8.0_121 -R 5. 建立容器系统的JAVA_HOME目录 mkdir /usr/lib/jvm 6.移动jdk目录到JAVA_HOME目录 mv ~/jdk1.8.0_121 /usr/lib/jvm 7.安装vim(可选) apt-get update apt-get install vim 8.设置环境变量 vim ~/.bashrc #set oracle jdk environment export JAVA_HOME=/usr/lib/jvm/jdk1.8.0_121 ## 这里要注意目录要换成自己解压的jdk 目录 export JRE_HOME=${JAVA_HOME}/jre export CLASSPATH=.

JDK安装

那年仲夏 提交于 2019-12-29 17:43:32
yum -y install java-1.8.0-openjdk* 检查: java -version java -version openjdk version "1.8.0_144" OpenJDK Runtime Environment (build 1.8.0_144-b01) OpenJDK 64-Bit Server VM (build 25.144-b01, mixed mode) 来源: CSDN 作者: nickyhubin 链接: https://blog.csdn.net/nickyhubin/article/details/103751575

Properly set up Java 9 as SDK in Intellij IDEA on Linux due to new folder structure

被刻印的时光 ゝ 提交于 2019-12-28 13:42:12
问题 Before you write me off, please consider that neither of these are answers to my question: How to setup SDK in IntelliJ IDEA? How do I change the IntelliJ IDEA default JDK? In IntelliJ IDEA 2017.2.6, attempting to add JDK9 as an SDK passes but does not work as the classpaths end up empty. Steps to reproduce: Open 'Add new SDK dialog' (go to Project Settings > Project > Project SDK > New > JDK) Select JDK 9 Passes, but if you look under SDK > JDK9 classpaths are empty and your code errors out

Java并发(一) 之 Java调用native文件

旧巷老猫 提交于 2019-12-26 20:38:32
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 转载备注地址: 1、初始化环境介绍 1.1 环境介绍 CentOS Linux release 7.3.1611 (Core) OpenJDK 1.8 1.2 环境配置 1.2.1 OpenJDK 安装 yum -y install java-1.8.0-openjdk java-1.8.0-openjdk-devel 获取java home: dirname $(readlink $(readlink $(which java))) 设置环境变量: vim /etc/profile.d/env_export.sh 在新建的文件中填写 export JAVA_HOME=上面dirname命令获取到的路径,不要jre/bin最后这段 export PATH=$PATH:$JAVA_HOME/bin export CLASSPATH=.:$JAVA_HOME/jre/lib:$JAVA_HOME/lib:$JAVA_HOME/lib/tools.jar 1.2.2 gcc安装 yum -y install gcc 2、Java 调用 .c文件 2.1 Java测试代码 2.2 编译Java代码 1、上传代码至服务器 2、编译.class文件 3、编译.h 头文件 2.3 查看.h头文件 2.4 编写.c文件

Trouble building J2V8 on Ubuntu

為{幸葍}努か 提交于 2019-12-25 19:12:24
问题 I'm trying to build J2V8 on Ubuntu 16.04 but I keep getting errors. I'm running the install script provided on Github but I keep getting this error: (edited for brevity) make[1]: Leaving directory '/home/andrew/REUIOT/J2V8/node/out' ln -fs out/Release/node node cp: cannot stat '/data/jenkins/node': No such file or directory com_eclipsesource_v8_V8Impl.cpp:11:17: fatal error: jni.h: No such file or directory compilation terminated. [INFO] Scanning for projects... [INFO] BUILD FAILURE----------