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COMPSs @ 1a77a86

TANGO Programming Model and Runtime Abstraction Layer

© Barcelona Supercomputing Center 2016 - 2018


The TANGO Programming Model and Runtime Abstraction Layer is a combination of the BSC's COMPSs and OmpSs task-based programming models, where COMPSs is dealing with the coarse-grain tasks and platform-level heterogeneity and OmpSs is dealing with fine-grain tasks and node-level heterogeneity.

Installation Guide



  • Supported platforms running Linux (i386, x86-64, ARM, PowerPC or IA64)
  • Apache maven 3.0 or better
  • Java SDK 8.0 or better
  • GNU C/C++ compiler versions 4.4 or better
  • CNU GCC Fortran
  • autotools (libtool, automake, autoreconf, make)
  • boost-devel
  • python-devel 2.7 or better
  • GNU bison 2.4.1 or better.
  • GNU flex 2.5.4 or 2.5.33 or better. (Avoid versions 2.5.31 and 2.5.34 of flex as they are known to fail. Use 2.5.33 at least.)
  • GNU gperf 3.0.0 or better.
  • SQLite 3.6.16 or better.

--with-monitor option:

  • xdg-utils package
  • graphviz package

--with-tracing option

  • libxml2-devel 2.5.0 or better
  • gcc-fortran
  • papi-devel (sugested)

Installation script

To install the whole framework you just need to checkout the code and run the following command

$ git clone --recursive

$ cd programming-model-and-runtime/

$ ./ <Installation_Prefix> [options]


#User local installation

$./ $HOME/TANGO --no-monitor --no-tracing

#System installation

$ sudo -E ./ /opt/TANGO

If you want to re-install only one part (COMPSs or OmpSs) you have to define the PM_BUILD environment variable before running the script. Values for the variable are ONLY_COMPSS, ONLY_OMPSS or ALL. Not defining de variable has the same effect as ALL

#User local installation

$ PM_BUILD=ONLY_COMPSS ./ $HOME/TANGO --no-monitor --no-tracing

#System installation


User Guide

Application Development Overview

To develop an application with the TANGO programming model, developers has to at least implement 3 files: the application main workflow in appName.c/cc, the application functions which are going to be coarse-grain tasks in appName.idl, and the implementation of the functions in Other application files can be included in a src folder providing the building configuration in a Makefile

  • appName.c/cc -> Contains the main coarse-grain task workflow
  • appName.idl -> Coarse-grain task definition
  • appName-functions.c/cc -> Implementation of the coarse grain tasks

To define a coarse-grain task which contains fine-grain tasks, developers have to annotate the coarse-grain fucntions with the OmpSs pragmas.

More information about how to define coarse-grain tasks and other concerns when implementing a coarse-grain task workflow can be found in

More information about how to define fine-grain tasks and other considerations when implementing a fine-grain task workflow can be found in

Application Compilation

To compile the application use the compss_build_app script. The usage of this command is the following

$ compss_build_app --help
Usage: /opt/COMPSs/Runtime/scripts/user/compss_build_app [options] application_name
Usage: /opt/COMPSs/Runtime/scripts/user/compss_build_app [options] application_name application_arguments

* Options:
    --help, -h                              Print this help message

    --opts                                  Show available options

    --version, -v                           Print COMPSs version
  General Options:
    --only-master                           Builds only the master part
                                            Default: Disabled
    --only-worker                           Builds only the worker part
                                            Default: Disabled
  Tools enablers:
    --ompss                                 Enables worker compilation with OmpSs Mercurium compiler
                                            Default: Disabled
    --cuda                                  Enables worker compilation with CUDA compilation flags
                                            Default: Disabled
    --opencl                                Enables worker compilation with openCL compilation flags
                                            Default: Disabled
  Specific compiler and linker flags:
    --CXX=<C++ compiler>                    Defines an specific C++ compiler (cross_compiling)
    --CC=<C compiler>                       Defines and specific C compiler (cross_compiling)
    --CFLAGS="-cFlag_1 ... -cFlag_N"        Defines C compiler flags
    --CXXFLAGS="-cxxflag_1 ... -cxxflag_N"  Defines C++ compiler flags
    --CPPFLAGS="-cppflag_1 ... -cppflag_N"  Defines C pre-processor flags
    --LDFLAGS="-ldflag_1 ... -ldflag_N"     Defines Linker flags
    --LIBS="-L<libPath> -l<lib> <stLib.a>"  Define libraries in the compilation
                                            Default: -lpthread /home/jorgee/Shared/Projects/Tango/apps/libjpeg/lib64/libjpeg.a

 Specific tools flags:
    --MCC="Mercurium C compiler"            Specifies the mercurium C compiler profile (cross-compiling OmpSs)
                                            Default: mcc
    --MCXX="Mercurium C++ compiler"         Specifies the mercurium compiler profile (cross-compiling OmpSs)
                                            Default: mcxx
    --with_ompss=<ompss_installation_path>  Enables worker compilation with OmpSs Mercurium compiler installed in a certain location
                                            Default: Disabled
    --mercurium_flags="flags"               Specifies extra flags to pass to the mercurium compiler
                                            Default: Empty
    --with_cuda=<cuda_installation_path>    Enables worker compilation with CUDA installed in a certain location
                                            Default: Disabled
    --with_opencl=<ocl_installation_path>   Enables worker compilation with openCL installed in a certain location
                                            Default: Disabled
    --opencl_libs="libs"		    Specifies extra opencl libraries locations
					    Default: Empty

To compile with only COMPSs application use the following command:

$ compss_build_app appName

To compile with a COMPSs application with fine-grain managed by OmpSs tasks use the following command:

$ compss_build_app --ompss appName

If there are fine-grain tasks which can be run in CUDA devices use the following command:

$ compss_build_app --ompss --cuda appName

Application Execution

An application implemented with the TANGO programming model can be easily executed by using the COMPSs execution scripts. It will automatically starts the Runtime Abstraction Layer and execute transparently either coarse-grain and fine-grain tasks in the selected resources.

Users can use the runcompss script to run the application in interactive nodes.

Usage: runcompss [options] application_name application_arguments  

An example to run the application in the localhost (interesting for initial debugging)

$ runcompss --lang=c appName appArgs...

To run an application in a preconfigured grid of computers you have to provide the resource description in a resources.xml file and the application configuration in these resources in the project.xml. Information about how to define this files can be found in

runcompss --lang=c --project=/path/to/project.xml --resources=/path/to/resources.xml appName app_args

More information about other possible arguments can be found by executing

$ runcompss --help       

To queue an application in a cluster managed by the SLURM resource manager, users has to use the enqueue_compss command.

Usage: enqueue_compss [queue_system_options] [rucompss_options] application_name application_arguments

The following command show how to queue the application by requesting 3 nodes with at least 12 cores, 2 gpus and 32GB of memory (approx.)

$ enqueue_compss --num_nodes=3 --cpus-per-node=12 --gpus-per-node=2 --node-memory=32000 --lang=c appName appArgs

Other options available for enqueue_compss can be found by executing

$ enqueue_compss --help

Supporting Sigularity

To run applications distributed in singularity containers, the user have to specify the image of this container with the container_image flag when submitting the application with the enqueue_compss command. The following lines show an example of this command:

$ enqueue_compss --num_nodes=3 --cpus-per-node=12 --gpus-per-node=2 \
          --node-memory=32000 –container_image=/path/to/container.img  \
          --lang=c appName appArgs

Enabling elasticity

When submitting an execution users must indicate the number of fixed nodes requested in the enqueue_compss command. To enable node elasticity users should indicate with the –elasticity flags, the number of extra nodes that an application can request according to its load. An example of this option is shown below.

$ enqueue_compss --num_nodes=3 --cpus-per-node=12 --gpus-per-node=2 \
          --node-memory=32000 --elasticity=2 --lang=c appName appArgs

In this case, the runtime automatically will calculate the optimal number of resources between 3 and 5. This option can be also be be combined with singularity by setting the elasticity and container_image options.

$ enqueue_compss --num_nodes=3 --cpus-per-node=12 --gpus-per-node=2 \
          --node-memory=32000 --elasticity=2 \
          --container_image=/path/to/container.img \
          --lang=c appName appArgs

In the case that, users want to let another component such as the Self-Adaptation Manager/ALDE the responsibility to scale up/down the resources, the application must be submitted with the enable_external_adaptation option of the enqueue_compss command as indicated in the example below.

$ enqueue_compss --num_nodes=3 --cpus-per-node=12 --gpus-per-node=2 \
       --node-memory=32000 --elasticity=2 --enable_external_adaptation=true \
       --container_image=/path/to/container.img --lang=c appName appArgs

Then, when the application is running, the adaptation of the nodes can be performed by means of the adapt_compss_resources command in the following way

$ adapt_compss_resources <master_node> <master_job_id> CREATE SLURM-Cluster default <singularity_image>

This command will submit another job requesting a new resource of type "default" (the same as the requested in the enqueue_compss) running the COMPSs worker of the singularity_image.

$ adapt_compss_resources <master_node> <master_job_id> REMOVE SLURM-Cluster <node_to_delete>

The same command can be used event without Slurm. In this case, the application will be started with runcompss with the flag --enable_external_adaptation=true and a project and resources file with a Direct Cloud conector defined. This conector will provide the capability of starting and stoping working nodes according to the adapt_compss_resources with the following arguments.

$ adapt_compss_resources <master_node> <AppName_execNum> CREATE Direct <node_to_start> default

The same changes apply to the remove command:

$ adapt_compss_resources <master_node> <AppName_execNum> REMOVE SLURM-Cluster <node_to_delete>

The following lines show an example of direct configuration in the resources.xml where we describe all the resources available in the insfrastructure.

<CloudProvider Name="Direct">
            <Image Name="default">
                        <Adaptor Name="es.bsc.compss.nio.master.NIOAdaptor">
                        <AttachedDisk Name="gpfs">
            <InstanceType Name="ns51">
                <Processor Name="MainProcessor">
                <Processor Name="GPU">



In the project.xml, we specify the resource we can add or remove in each execution. An example of project.xml is shown in the following lines

        <CloudProvider Name="Direct">
                        <Image Name="default">
                <InstanceType Name="ns51"/>
                <InstanceType Name="ns55"/>
                <InstanceType Name="ns56"/>
                <InstanceType Name="ns57"/>

Known Limitations

C++ Objects declared as arguments in a coarse-grain tasks must be passed in the task methods as object pointers in order to have a proper dependency management. We are evaluating how to support other possibilities.

Relation to other TANGO components

TANGO Programming Model and the Runtime Abstraction Layer components must be used together as explained above. It can be combined with other TANGO components to achive more complex features:

  • ALDE - TANGO Programming Model and Runtime will use ALDE to submit the code for compilation and packetization. Also it could be intereact with ALDE to submit the application directly to a TANGO compatible device supervisor.
  • Device Supervisor - The TANGO Programming Model Runtime can interact directly with SLURM which is one TANGO Device Supervisor. Other device supervisors will be supported by means of ALDE.
  • Self-Adaptation Manager - The TANGO Programming Model Runtime will interact with the Self-Adaptation Manager to optimize application execution in a TANGO compatible testbed.
  • Monitor Infrastructure - The TANGO Programming Model Runtime will interact with TANGO Monitor Infrastructure to obtain the energy consumption metrics in order to take runtime optimization decisions.