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# Cyclone DDS
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Cyclone DDS is by far the most performant and robust DDS implementation available on the market. 
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Beside, Cyclone DDS is developed completely in the open and is undergoing the acceptance process to become part of Eclipse IoT (see  [eclipse-cyclone-dds](https://projects.eclipse.org/proposals/eclipse-cyclone-dds)).
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# Getting Started
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## Building Cyclone DDS
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In order to build cyclone DDS you need to have installed on your host [cmake](https://cmake.org/download/) **v3.6.0** or higher, the [Java 8 JDK](http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html) or simply the [Java 8 RE](http://www.oracle.com/technetwork/java/javase/downloads/server-jre8-downloads-2133154.html), and [Apache Maven 3.5.x or higher](http://maven.apache.org/download.cgi).
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Assuming that **git** is also available on your machine then, simply do:
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    $ git clone https://github.com/eclipse/cyclonedds.git 
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    $ cd cyclonedds
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    $ mkdir build
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    $ cd build
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    $ cmake ../src
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    $ make
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    $ make install
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At this point you are ready to use **cyclonedds** for your next DDS project!
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## Examples
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Now that you have built and installed **cyclonecdds** it is time to experiment with some examples.
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### Building and Running the Roundtrip Example
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The first example we will show you how to build and run, measures cyclonedds latency and will allow you to see with your eyes how fast it is!
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Do as follows:
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    $ cd cyclonedds/src/examples/roundtrip
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    $ mkdir build
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    $ cd build
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    $ cmake ..
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    $ make
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Now that you've build the roundtrip example it is time to run it. 
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On one terminal start the applications that will be responding to **cyclonedds** pings.
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    $ ./RoundtripPong
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On another terminal, start the application that will be sending the ping.
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    $ ./RoundtripPing 0 0 0 
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    # payloadSize: 0 | numSamples: 0 | timeOut: 0
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    # Waiting for startup jitter to stabilise
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    # Warm up complete.
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    # Round trip measurements (in us)
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    #.          Round trip time [us]         Write-access time [us]      Read-access time [us]
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    # Seconds Count     Median    Min      Count     Median    Min     Count     Median      Min
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        1     13476       70       66      13476       14       12      13476        2        1
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        2     11972       73       66      11972       14       13      11972        2        1
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        3     13109       71       67      13109       14       12      13109        2        1
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        4     12259       72       67      12259       14       12      12259        2        1
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        5     12928       71       67      12928       14       12      12928        2        1
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The number above were measure on a 13' MacBook pro running a 3,1 GHz Intel Core i5. From these number you can see how the roundtrip is incredibly stable and the minimal latency is slightly over 30 micro-seconds (on this HW).
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## Documentation
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The Cyclone DDS documentation is available [here](http://cdds.io/docs).
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