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OmpSs-2 2023.11
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@kevinsala kevinsala released this 22 Nov 16:08
· 6 commits to master since this release
2023.11
c173c4d

Version 2023.11, Wed Nov 22, 2023

The OmpSs-2 2023.11 release includes performance and bugfixes for the runtime systems, several new features for the nOS-V tasking library, and performance improvements on the taskiter construct implementation. It also implements the ALPI (version 1.0) in the runtime systems, which provides support for task-aware libraries. The LLVM/OpenMP includes a new OpenMP runtime called OpenMP-V (libompv) that works on top of the nOS-V tasking library. A new instrumentation library called Sonar is provided to instrument MPI function calls through ovni.

General

  • The OmpSs-2 runtime systems expose the ALPI generic low-level tasking interface

Nanos6

  • Implement the ALPI interface (version 1.0)
  • Allow embedding jemalloc allocator
  • Embed hwloc and jemalloc by default
  • Add devices.cuda.prefetch config option to control CUDA prefetching of data dependencies (enabled by default)
  • Install the nanos6.toml config file in $prefix/share
  • Remove obsolete instrument.h public interface
  • Remove obsolete stats and graph instrumentations
  • Remove software dependency with libunwind and elfutils
  • Fix execution when enabling extrae instrumentation
  • Remove memory leaks
  • Various bugfixes and corrections

nOS-V

  • Implement the ALPI interface (version 1.0)
  • Add misc.stack_size config option to change the stack size of nOS-V threads
  • Add ovni.level config option for fine-grained instrumentation control
  • Change nosv_attach API to not require an explicit task type and support multiple attaches
  • Implement parallel tasks which can be executed on multiple CPUs at once
  • Allow calling nosv_init and nosv_shutdown multiple times
  • Change error handling to return custom nOS-V error codes
  • Allow early wake of deadline tasks with nosv_submit passing the NOSV_SUBMIT_DEADLINE_WAKE flag
  • Add compatibility layer for calls to sched_get/setaffinity and pthread_get/setaffinity
  • Add instrumentation points for the nosv_create and nosv_destroy APIs
  • Various bugfixes and corrections

NODES

  • Improve performance of the taskiter construct
  • Fix several bugs of the taskiter implementation
  • Ensure nOS-V library is at the first level of dependencies
  • Use the updated attach/detach from nOS-V 2.0
  • Drop support for nOS-V versions older than 2.0

LLVM/OpenMP

  • Provide OpenMP runtime named OpenMP-V (libompv) working over the nOS-V tasking library (-fopenmp=libompv)
  • Make OpenMP-V runtime compatible with task-aware libraries
  • Drop support for task-aware libraries in vanilla OpenMP runtime libomp

LLVM/Clang

  • Fix task data dependencies' calculation for long double types

Ovni

  • Add OVNI_TRACEDIR envar to change the trace directory (default is ovni)
  • Add the ovniver program to report the libovni version and commit
  • Add ovni_version_get() function
  • Add nOS-V API subsystem events for nosv_create() and nosv_destroy()
  • Add TAMPI model with T code, subsystem events and cfgs
  • Add MPI model with M code, function events and cfgs
  • Don't hardcore destination directory names like lib, to use the ones in the destination host (like lib64)

Sonar

  • Introduce the Sonar library that uses ovni for instrumenting MPI functions

Task-Aware Libraries

  • Leverage the ALPI interface instead of the Nanos6-specific interface
  • Drop support for OmpSs-2 versions older than 2023.11
  • See other features and fixes in each task-aware libraries' CHANGELOG
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