nOS-V 3.1.0 (OmpSs-2 2024.11)

Version 3.1.0, Fri Nov 15, 2024

This version corresponds to the OmpSs-2 2024.11 release. It contains performance and instrumentation improvements, support for RISC-V and coroutines, and a new topology API.

Changelog

• Introduce support for breakdown model implementation, supported through the use of ovniemu -b.
• Refactor shutdown mechanism, using a coordinated approach to prevent contention during runtime shutdown.
• Introduce a Memory Pressure API, to query the current occupancy of the nOS-V shared memory segment.
• Allow re-initialization of nOS-V, permitting the call to nosv_init() after nosv_shutdown().
• Enable turbo setting by default, and add correctness checking to detect changes to FPU flags from outside of nOS-V.
• Add support for coroutines and similar constructs through the nosv_suspend() API.
• Add support for RISC-V.
• Introduce a Topology API, which allows the configuration of system topology through the nosv.toml file.
• Allow submitting tasks as NOSV_SUBMIT_IMMEDIATE from a task's run callback.
• Introduce nosv_cond_t and related calls, as a replacement for pthread condition variables.
• Other miscellaneous fixes and improvements.

nOS-V 2.2.0 (OmpSs-2 2024.05)

Version 2.2.0, Wed May 15, 2024

This version corresponds to the OmpSs-2 2024.05 release. It contains batch task submission, a new barrier and mutex API and ovni instrumentation for parallel tasks.

Changelog

• Implement a batch submission API, which can accumulate tasks to submit them in batch once a certain threshold has been reached.
• Add nosv_mutex_t and nosv_barrier_t as nOS-V aware alternatives to their pthread counterparts, improving interoperability.
• Add instrumentation points for the nosv_attach and nosv_detach calls.
• Add instrumentation for parallel tasks.
• Activate the turbo.enabled configuration option by default, which enables flush-to-zero in x86-64 and aarch64.
• Perform safety checks when the turbo.enabled configuration option is set to verify FPU flags are not modified by external libraries.
• Split instrumentation events for the scheduler to allow them to be more granularly controlled.
• Allow nOS-V programs to call fork() without leaving the forked process in an incoherent state.
• Various refactors and bugfixes.

nOS-V 2.1.2

Version 2.1.2, Fri Apr 12, 2024

This version is a bugfix release, containing only compatible fixes with the previous patch versions.

Changelog

• Allow nested calls to nosv_init and nosv_shutdown.
• Add compatibility with newer versions of the ovni library.
• Bypass calls to the pthread library when using nOS-V fake affinity support.
• Fix an assert that could trip under specific conditions when using parallel tasks.

nOS-V 2.1.1 (OmpSs-2 2023.11)

Version 2.1.1, Fri Nov 17, 2023

This version corresponds to the OmpSs-2 2023.11 release. It contains changes to the attach API, support for the ALPI tasking interface, and support for parallel tasks.

Changelog

• Add misc.stack_size config option to change the stack size of nOS-V threads
• Allow calling nosv_init and nosv_shutdown multiple times
• Change error handling to return custom nOS-V error codes
• Implement nosv_cancel API to wake up blocked tasks before their timeout expires
• Add compatibility layer for calls to sched_get/setaffinity and pthread_get/setaffinity
• Implement ovni.level configuration option and fine-grained instrumentation control
• Add instrumentation points for the nosv_create and nosv_destroy APIs
• Implement parallel tasks which can be executed on multiple CPUs at once
• Change nosv_attach API to not require an explicit task type and support multiple attaches
• Implement ALPI (Async Lowlevel Programming Interface) support
• Various bugfixes and corrections

nOS-V 1.0.0

Version 1.0.0