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omp4j CircleCI

Lightweight Java OMP-like preprocessor written in Scala and Java. The input of the preprocessor are valid Java source files with proper directives (i.e. // omp ... comments). One can use omp4j either as blackbox compiler (i.e. a preprocessor using javac) or as pure preprocessor. In latter case the output is valid paralellized Java source files.


The described method is for UNIX-like systems. While Microsoft Windows are supported, the users are expected to figure the installation steps by themselves.

Run Prerequisites

Only JDK is required in case only the preprocessor is used. This is a common use-case.

The following JDKs are supported and tested.

  • OracleJDK8
  • OracleJDK7
  • OpenJDK7
  • OpenJDK6

Fetching omp4j

Download omp4j-*.jar from the releases page.

Using omp4j

Simply run

java -jar omp4j-*.jar <args>

Where <args> represent the desired program arguments as described in tutorial

We advise the users to create an omp4j alias which represents java -jar omp4j-*.jar. By this trick, the previous preprocessor call might be replaced with omp4j <args>.


In case of development, a slightly different environment and installation steps are recommended.

Development Prerequisites

The developer is expected to work with an UNIX-like up-to-date operating system. The officially supported operating systems are ArchLinux and Ubuntu 16.04 LTS.

The functional working environment is provided via docker image omp4j/base. Its corresponding dockerfile is located in dockerfiles/base.dockerfile.

The following software must be installed in order to fetch, compile and test omp4j.

  • git
  • supported JDK (see above)
  • sbt (tested version 0.13.13)

The version of Scala used for running sbt is irrelevant as long as sbt can be launched in the specified version above. sbt employs Scala 2.10.3.

Fetching code

Forking the project is strongly recommended since pushing directly to the official repository is forbidden. However, we provide the URL for this repository. The URL should be modified accordingly.

$ git clone --recursive
$ cd omp4j


Once the source code is fetched, it might be easily compiled via sbt API.

$ sbt compile

Unit testing

When the code is compiled, the unit tests should be run.

$ sbt test

Running omp4j

In development mode, omp4j might be invoked sbt interface.

$ sbt run <args>

This option is not suggested and it should be employed only for the development purposes since it perform significantly more poorly and the runtime library must be present in the classpath. For this reason, we encourage the user to assembly the preprocessor and use the final .jar. See Using omp4j above.


The preprocessor should be distributed as a dependency-less .jar file. For this purpose, sbt is provided with the assembly command.

$ sbt assembly

This command creates .jar package in target/scala-<version>/. This package is ready for deployment as has no further dependencies. See Using omp4j above.

API reference

sbt might be used to generate the API reference.

$ sbt doc

This command creates directory target/scala-<version>/api/ including file index.html. One can simply open it in web browser in order to browse API reference.


See project website for contacts and details.


Developed under BSD license, please refer to LICENCE file.


Lightweight Java OMP preprocessor







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