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OmpSs-2 Release Notes

All notable changes to the OmpSs-2@Clusters programming model, the Nanos6 runtime system, the Mercurium source-to-source compiler will be documented in this file.

Version 2022.12, Wed Dec 21, 2022

General

  • Several important performance improvements and bug fixes.
  • Integrating the DLB library for Dynamic Load Balancing with the Nanos6@Cluster runtime [1].
  • Introducing the auto and none clauses permitting productive development of programs with nested tasks [2].

Instrumentation

  • Improved STATS instrumentation report enhancing readability.

[1] Jimmy Aguilar Mena, Omar Shaaban, Victor Lopez, Marta Garcia, Paul Carpenter, Eduard Ayguade, and Jesus Labarta. Transparent load balancing of MPI programs using OmpSs-2@Cluster and DLB. ICPP2022.

[2] Omar Shaaban, Jimmy Aguilar Mena, Vicenç Beltran, Paul Carpenter, Eduard Ayguade and Jesus Labarta Mancho. Automatic aggregation of subtask accesses for nested OpenMP-style tasks. SBAC-PAD 2022.

Version 2022.02, Mon Feb 28, 2022

The OmpSs-2@Clusters 2022.02 contains several improvements and fixes.

General

  • Remove over-subscription of leader-thread and fix load imbalance with task for.
  • task for now respects the priority clause.
  • Improve communication performance by grouping messages by destination.
  • Reduce redundant communications and data transfers.
  • Fix multiple leaks of memory in the messages and dependencies.

Instrumentation

  • Fix instrumentation toml variable list parse
  • Add instrumentation events for task for

Version 2021.05, Thu May 06, 2021

The OmpSs-2@Clusters 2021.05 release is the first release diverged from the OmpSs-2 for smp systems..

General

  • new node annotation clause to control nodes to offload or other hints.
  • Several important performance improvements.
  • Fix wait clause to control early release.
  • Polling services on LeaderThread
  • New scheduling infrastructure for clusters.
  • Nodes namespaces.
  • Fixed compatibility with some older machines and compilers.
  • Fixed message size limit issue when dependencies were > 2GB.
  • Grouped granular data fetches messages per node.

Instrumentation

  • Optional instrumentation for the dependency system stages.
  • New function nanos6_instrument_event to create instrumentation events from the user code when using instrumentation.