COMPSs 2.1 Release


The COMPSs software was updated to version 2.1 earlier this year.

Dear colleagues,

we are proud to announce the new release 2.1 of PyCOMPSs/COMPSs, codename Bougainvillea.

This release updates PyCOMPSs/COMPSs with the following main features:

New features:

  • Runtime:
    – New annotations to simplify tasks that call external binaries
    – Integration with other programming models (MPI, OmpSs,..)
    – Support for Singularity containers in Clusters
    – Extension of the scheduling to support multi-node tasks (MPI apps
    as tasks)
    – Support for Grid Engine job scheduler in clusters
    – Language flag automatically inferred in runcompss script
    – New schedulers based on tasks’ generation order
    – Core affinity and over-subscribing thread management in multi-core
    cluster queue scripts (used with MKL libraries, for example)
  • Python:
    – @local annotation to support simpler data synchronizations in
    master (requires to install guppy)
    – Support for args and kwargs parameters as task dependencies
    – Task versioning support in Python (multiple behaviors of the same task)
    – New Python persistent workers that reduce overhead of Python tasks
    – Support for task-thread affinity
    – Tracing extended to support for Python user events and HW counters
    (with known issues)
  • C:
    – Extension of file management API (compss_fopen, compss_ifstream,
    compss_ofstream, compss_delete_file)
    – Support for task-thread affinity
  • Tools:
    – Visualization of not-running tasks in current graph of the COMPSs
    Monitor

Improvements
– Improved PyCOMPSs serialization
– Improvements in cluster job scripts and supercomputers configuration
– Several bug fixes

Known Limitations:
– When executing Python applications with constraints in the cloud
the <InitialVMs> property must be set to 0
– Tasks that invoke Numpy and MKL may experience issues if tasks use
a different number of MKL threads. This is due to the fact that MKL
reuses threads in the different calls and it does not change the number
of threads from one call to another.

For further information, please refer to “COMPSs User Manual:
Application development guide”.

For more details and downloads please visit our webpage:

compss.bsc.es

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