2.1. Installation of OmpSs¶

2.1.1. Preparation¶

You must first choose a directory where you will install OmpSs. In this document this directory will be referred to as TARGET. We recommend you to set an environment variable TARGET with the desired installation directory. For instance:

$ export TARGET=$HOME/ompss

2.1.2. Installation of Extrae (optional)¶

This is just a quick summary of the installation of Extrae. For a more detailed information check Extrae Homepage

Get Extrae from https://tools.bsc.es/downloads (choose Source tarball of Extrae tool).
Unpack the tarball and enter the just created directory:
```
$ tar xfz extrae-xxx.tar.gz
$ cd extrae-xxx
```
Configure it:
```
$ ./configure --prefix=$TARGET
```
Note

Extrae may have a number of dependences. Do not hesitate to check the Extrae User’s Manual
Build and install:
```
$ make
$ make install
```

Now you can proceed to the Installation of Nanos++. Do not forget to pass --with-extrae=$TARGET to Nanos++ configure.

2.1.3. Installation of Nanos++¶

First, make sure that you fulfill all the Nanos++ build requirements.
Get the latest Nanos++ tarball (nanox-version-yyyy-mm-dd.tar.gz) from https://pm.bsc.es/ompss-downloads Unpack the file and enter the just created directory:
```
$ tar xfz nanox-version-yyyy-mm-dd.tar.gz
$ cd nanox-version
```
Run configure. There are a number of flags that enable or disable different features of Nanos++. Make sure you pass --prefix with the destination directory of your OmpSs installation (in our case TARGET).

Important

If you want instrumentation support, you must add --with-extrae=dir to your configure-flags (see below), where dir is the directory where you installed Extrae (usually TARGET).

Check Nanos++ configure flags for more information about configure-flags.
```
$ ./configure --prefix=$TARGET configure-flags
```
Note

You can pass an empty set of configure-flags.

Hint

configure prints lots of output, but a small summary of enabled features is printed at the end. You may want to check it to ensure you are correctly passing all the flags
Build
```
$ make
```
This may take some time. You may build in parallel using make -jN where N is the maximum number of threads you want to use for parallel compilation.
Install
```
$ make install
```
This will install Nanos++ in TARGET.

Now you can proceed to Installation of Mercurium C/C++/Fortran source-to-source compiler.

2.1.3.1. Nanos++ build requirements¶

There are a number of software requirements to successfully build Nanos++ from the source code.

Important

Additional software is needed if you compile from the git repository. This section details the requirements when building from a tarball (a tar.gz file).

A supported platform running Linux (i386, x86-64, ARM, PowerPC or IA64).
GNU C/C++ compiler versions 4.4 or better.

If you want CUDA support:

CUDA 5.0 or better.

If you want to enable the cluster support in Nanos++ you will need:

GASNet 1.14.2 or better

2.1.3.2. Nanos++ configure flags¶

By default Nanos++ compiles three versions: performance, debug and instrumentation. Which one is used is usually governed by flags to the Mercurium compiler. You can speedup the build of the library by selectively disabling these versions.

You can also enable a fourth version: instrumentation-debug. That one is probably of little interest to regular users of Nanos++ as it enables debug and instrumentation at the same time.

`--disable-instrumentation`
	Disables generation of instrumentation version
`--disable-debug`
	Disables generation of debug version
`--disable-performance`
	Disables generation of performance version
`--enable-instrumentation-debug`
	Enables generation of instrumentation-debug version

Besides the usual shared memory environment (which is called the SMP device), Nanos++ supports several devices. Such devices are automatically enabled if enough support is detected at the host. You can disable them with the following flags.

`--disable-gpu-arch`
	Disables CUDA support
`--disable-opencl-arch`
	Disables OpenCL support

Nanos++ includes several plugins that are able to use other software packages. You can enable them using the following flags.

`--with-cuda=dir`
	Directory of CUDA installation. By default it checks `/usr/local/cuda`. If a suitable installation of CUDA is found, CUDA support is enabled in Nanos++ (unless you disable it)
`--with-opencl=dir`
	Directory of OpenCL installation. By default it checks `/usr`. If a suitable installation of OpenCL is found, OpenCL support is enabled in Nanos++ (unless you disable it)
`--with-opencl-include=dir`
	If you use –with-opencl=dir, `configure` assumes that dir/`include` contains the headers. Use this flag to override this assumption.
`--with-opencl-lib=dir`
	If you use –with-opencl=dir, `configure` assumes that dir/`lib` contains the libraries. Use this flag to override this assumption.
`--with-extrae=dir`
	Directory of Extrae installation. This is mandatory if you want instrumentation. Make sure you have already installed Extrae first. See Installation of Extrae (optional)
`--with-mpitrace=dir`
	This is a deprecated name for `--with-extrae`
`--with-nextsim=dir`
	Directory of NextSim installation
`--with-ayudame=dir`
	Directory of Ayudame installation
`--with-hwloc=dir`
	Directory of Portable Hardware Locality (hwloc) installation. This is highly recommended for NUMA setups
`--with-chapel=dir`
	Directory of Chapel installation
`--with-mcc=dir`	Directory of Mercurium compiler. This is only for testing Nanos++ itself and only useful to Nanos++ developers.

2.1.4. Installation of Mercurium C/C++/Fortran source-to-source compiler¶

You can find the build requirements, the configuration flags and the instructions to build Mercurium in the following link: https://github.com/bsc-pm/mcxx/blob/master/README.md

Once you complete all the steps listed in the link above you should be ready to Compile OmpSs programs.