基于Java的RDMA高性能通信库（五）：JXIO

朱雀 2022-05-19 04:53 407阅读 0赞

JXIO 是 Mellanox 公司的RDMA中间件accelio在Java上的包装，JXIO使用类似于Java nio的ServerChannel方式，熟悉接口可以做好变换。AcceliO是针对硬件加速而优化的高性能异步可靠消息传递和RPC库。 实现RDMA和TCP / IP传输，并且其他传输（例如共享存储器）可以利用高效且方便的API。

**libxio（又名库accelio）是一个位于RDMA之上的轻量级消息传递库。**该库为零拷贝消息传递和无锁定可扩展性，提供了异步消息传递设计。由于Accelio是基于C++高性能通信库，AcceliO相应的提出了Java上的开发库JXIO，我们利用JXIO就可用调用Accelio高性能，异步，可靠消息传递和远程过程调用（RPC）的库，其中包括高性能RDMA传输通信接口。

JXIO使用广泛，包括**RDMA for Hadoop Distributed FileSystem，**其中使用的RDMA通信库就是JXIO。但是现如今JXIO项目已经两年停滞更新了。最近的[Mellanox][] 公司推出的SparkRDMA，4个月前刚刚更新。其中使用的就是IBM的RDMA高性能通信框架DiSNI，可以看出JXIO渐渐被DiSNI所替代。下面我们介绍一下JXIO的使用。

## 1.Build instructions ##

1. Download: git clone [https://github.com/accelio/JXIO.git][https_github.com_accelio_JXIO.git]  
2. Move into folder: cd JXIO  
3. Set JAVA\_HOME: export JAVA\_HOME=/usr/java/jdk1.7.0\_25/  
4. Build: ./build.sh (this pulls the relevant C level Accelio library and builds everything you need)

## 2.Examples ##

在examples文件夹中有HelloWorld示例。 客户端和服务器都是单线程的。 客户端向服务器发送单个消息，并在收到响应后退出。JXIO开源地址：[https://github.com/accelio/JXIO][https_github.com_accelio_JXIO]

1.  Run Server side: ./examples/runHelloWorld.sh server 36.0.0.120 1234  
    LD library is: /.autodirect/mtrswgwork/katyak/tmp/jxio/examples  
    Compiling JAVA files....  
    Running Server side test  
    2014-02-16 11:17:35,013 main INFO HelloServer:44 waiting for JXIO incoming connections  
    2014-02-16 11:17:46,576 main INFO HelloServer:90 \[SUCCESS\] Got event onSessionNew from 36.0.0.121, URI='rdma://36.0.0.120:1234/'  
    2014-02-16 11:17:46,578 main INFO HelloServer:108 \[SUCCESS\] Got a message request! Prepare the champagne!  
    2014-02-16 11:17:46,579 main INFO HelloServer:116 msg is: 'Hello Server'  
    2014-02-16 11:17:46,583 main INFO HelloServer:135 \[EVENT\] Got event SESSION\_CLOSED
2.  Run Client side: ./examples/runHelloWorld.sh client 36.0.0.120 1234  
    LD library is: /.autodirect/mtrswgwork/katyak/tmp/jxio/examples  
    Compiling JAVA files....  
    Running Client side test...  
    2014-02-16 11:17:46,552 main INFO HelloClient:68 Try to establish a new session to 'rdma://36.0.0.120:1234/'  
    2014-02-16 11:17:46,580 main INFO HelloClient:102 \[SUCCESS\] Session established! Hurray !  
    2014-02-16 11:17:46,581 main INFO HelloClient:106 \[SUCCESS\] Got a message! Bring the champagne!  
    2014-02-16 11:17:46,582 main INFO HelloClient:114 msg is: 'Hello to you too, Client'  
    2014-02-16 11:17:46,582 main INFO HelloClient:118 Closing the session...  
    2014-02-16 11:17:46,585 main INFO HelloClient:126 \[EVENT\] Got event SESSION\_CLOSED  
    2014-02-16 11:17:46,586 main INFO HelloClient:57 Client is releasing JXIO resources and exiting

[Mellanox]: https://github.com/Mellanox
[https_github.com_accelio_JXIO.git]: https://github.com/accelio/JXIO.git
[https_github.com_accelio_JXIO]: https://github.com/accelio/JXIO