How to use DMA or RDMA in java?

Question

“DMA” here means: Direct memory access, and “RDMA”: Remote direct memory access.

I used Java to create an application for transferring stock data, but found that the wait time was longer than I expected. I heard that someone has developed an application like "DMA / RDMA" that has good performance, so I am wondering if I can use "DMA / RDMA" in Java?

If not, what language should I use, and if there are any good libraries to use?

Answer 1

This article from an IBM developer article gives a great overview of how DMA access can be achieved using java.

Answer 2

RDMA, because I know that this is a property of the network infrastructure (along with the corresponding kernel modules, etc.), and not in the programming language at the application level.

In other words, you will need to get a specialized kit to use RDMA to reduce network latency. The following is an example of a 10GbE network card that supports RDMA:.

Answer 3

Java applications are able to process files through nio packages. These mmaped files can be accessed by several programs - I'm afraid this closes the thing for DMA, available in java

Answer 4

You have two options (what I know):

• Java SDP - Deprecated
• JXIO [1], a high-performance messaging library built on RDMA and supported by Mellanox

[1] https://github.com/accelio/JXIO

Answer 5

There is DiSNI , a new library for RDMA programming in Java. DiSNI is an open source version of IBM jVerbs. Here are some performance metrics that illustrate how RDMA with Java compares with sockets in C and Java, as well as with RDMA in C.

Answer 6

Java 7 supports SDP on Solaris and Linux (with OpenFabrics.org drivers). Unfortunately, SDP is deprecated in OFEX 2.x. People resort to the JNI wrapper, for example, jVerbs.