HPX

HPX is a general purpose C++ runtime system for parallel and distributed applications of any scale. Even if that's quite a mouthful, we mean every word of it!

The goal of HPX is to create a high quality, freely available, open source implementation of the ParalleX model for conventional systems, such as classic Linux based Beowulf clusters or multi-socket highly parallel SMP nodes. At the same time, we want to have a very modular and well designed runtime system architecture which would allow us to port our implementation onto new computer system architectures. We want to use real world applications to drive the development of the runtime system, coining out required functionalities and converging onto a stable API which will provide a smooth migration path for developers. The API exposed by HPX is modelled after the interfaces defined by the C++11 ISO standard and adheres to the programming guidelines used by the Boost collection of C++ libraries.

What's so special about HPX?

• HPX exposes an uniform, standards-oriented API for ease of programming parallel and distributed applications.
• It enables programmers to write fully asynchronous code using hundreds of millions of threads.
• HPX provides unified syntax and semantics for local and remote operations.
• HPX makes concurrency manageable with dataflow and future based synchronization.
• It implements a rich set of runtime services supporting a broad range of use cases.
• It is designed to solve problems conventionally considered to be scaling-impaired.
• HPX has been designed and developed for systems of any scale, from hand-held devices to very large scale systems.
• It is the first fully functional implementation of the ParalleX execution model.
• HPX is published under a liberal open-source license and has a open, active, and thriving developer community.

The documentation for the latest release of HPX (currently V0.9.5) can be found here.

Additionally, we regularily upload the current status of the documentation (which is being worked on as we speak) here.

If you plan to use HPX we suggest to start with the latest released version (currently HPX V0.9.5) which can be downloaded here.

If you would like to work with the cutting edge version from this repository we suggest following the current health status of the master branch by looking at our contiguous integration results website. While we try to keep the master branch stable and usable, sometimes new bugs trick their way into the code base - you have been warned!

In any case, if you happen to run into problems we very much encourage and appreciate any issue reports through the issue tracker for this Github project.

Build Instructions

All of HPX is distributed under the Boost Software License, Version 1.0 (See accompanying file LICENSE_1_0.txt or an online copy available here).

Before starting to build HPX, please read about the prerequisites.

Linux

1. Clone the master HPX git repository (or a stable tag):

   $ git clone git://github.com/STEllAR-GROUP/hpx.git
   

2. Create a build directory. HPX requires an out-of-tree build. This means you will be unable to run CMake in the HPX source directory:

   $ cd hpx
   $ mkdir my_hpx_build
   $ cd my_hpx_build
   

3. Invoke CMake from your build directory, pointing the CMake driver to the root of your HPX source tree:

   $ cmake -DBOOST_ROOT=/your_boost_directory \
        -DHWLOC_ROOT=/your_hwloc_directory \
        [other CMake variable definitions] \
        /path/to/hpx/source/tree
   

4. Invoke GNU make. If you are on a machine with multiple cores (very likely), add the -jN flag to your make invocation, where N is the number of cores on your machine plus one:

   $ gmake -j5
   

5. To complete the build and install HPX:

   $ gmake install
   

Mac OSX

1. Install a recent version of LLVM and Clang. In order to build hpx you will need a fairly recent version of Clang (at least version 3.2 of Clang and LLVM). For more instructions please see http://clang.llvm.org/get_started.html.

   If you're using Homebrew, brew install llvm --with-clang will do the trick. This will install Clang V3.2 into /usr/local/bin.

2. Visit http://libcxx.llvm.org/ to get the latest version of the "libc++" C++ standard library. You need to use the trunk version; what's currently bundled with XCode or OS X aren't quite there yet. You can follow the steps in http://libcxx.llvm.org/ if you choose, but here's briefly how it could be built:

   cd /path/to
   git clone http://llvm.org/git/libcxx.git
   cd libcxx/lib
   CXX=clang++-3.2 CC=clang-3.2 TRIPLE=-apple- ./buildit
   

   The library is then found in /path/to/libcxx/include and /path/to/libcxx/lib, respectively.

3. Build (and install) a recent version of Boost, using Clang and libc++:: To build Boost with Clang and make it link to libc++ as standard library, you'll need to set up the following in your Boost ~/user-config.jam file:

   # user-config.jam (put this file into your home directory)
   # ...
   # Clang 3.2
   using clang
     : 3.2
     : "/usr/local/bin/clang++"
     : <cxxflags>"-std=c++11 -stdlib=libc++ -isystem /path/to/libcxx/include"
       <linkflags>"-stdlib=libc++ -L/path/to/libcxx/lib"
     ;
   

   You can then use this as your build command:

   b2 --build-dir=/tmp/build-boost --layout=versioned toolset=clang-3.2 install -j5
   

4. Clone the master HPX git repository (or a stable tag):

   $ git clone git://github.com/STEllAR-GROUP/hpx.git
   

5. Build HPX, finally:

   $ cd hpx
   $ mkdir my_hpx_build
   $ cd my_hpx_build
   

   To build with Clang 3.2, execute:

   $ cmake /path/to/hpx/source/tree \
        -DCMAKE_CXX_COMPILER=/usr/local/bin/clang++ \
        -DCMAKE_C_COMPILER=/usr/local/bin/clang-3.2 \
        -DBOOST_ROOT=/your_boost_directory \
        -DCMAKE_CXX_FLAGS="-isystem /path/to/libcxx/include" \
        -DLINK_FLAGS="-L /path/to/libcxx/lib"
   $ make -j5
   

6. To complete the build and install HPX:

   $ make install
   

Windows

1. Clone the master HPX git repository (or a stable tag). You can use TortoiseGIT, or the git client that Cygwin provides. The git repository can be found at:

   git://github.com/STEllAR-GROUP/hpx.git
   

2. Create a build folder. HPX requires an out-of-tree-build. This means that you will be unable to run CMake in the HPX source folder.

3. Open up the CMake GUI. In the input box labelled "Where is the source code:", enter the full path to the source folder. In the input box labelled "Where to build the binaries:", enter the full path to the build folder you created in step 2.

4. Add CMake variable definitions (if any) by clicking the "Add Entry" button. Most probably you will need to at least add the directories where Boost is located as BOOST_ROOT and where Hwloc is located as HWLOC_ROOT.

5. Press the "Configure" button. A window will pop up asking you which compiler to use. Select the x64 Visual Studio 10 compiler (x64 Visual Studio 2012 is supported as well). Note that while it is possible to build HPX for x86 we don't recommend doing so as 32 bit runs are severely restricted by a 32 bit Windows system limitation affecting the number of HPX threads you can create.

6. If the "Generate" button is not clickable, press "Configure" again. Repeat this step until the "Generate" button becomes clickable.

7. Press "Generate".

8. Open up the build folder, and double-click hpx.sln.

9. Build the INSTALL target.