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DotMP Pre-Release v1.6.0-pre1

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@computablee computablee released this 09 Nov 07:15
· 240 commits to main since this release
v1.6.0-pre1
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Learn about vigilant mode.

DotMP v1.6.0 isn't planned to incorporate a ton of new features (though there are some!). Rather, it aims to provide a wide plethora of well-needed performance improvements across the board.

This is the first pre-release of v1.6.0.

Licensing Changes

The project license has been changed from MIT to LGPL 2.1.

Changes to the Scheduler API

The schedule parameter in Parallel.For and its derivatives now take implementations of the IScheduler interface instead of a DotMP.Schedule enum. The changes are fully source-compatible with previous versions, but breaks API and ABI compatibility. There are not only performance benefits to doing this, but in addition, the code is simpler, more modular, more maintainable, more readable, has less duplication, and is expansible by the user.

The IScheduler interface is public-facing and permits users to implement their own custom schedulers. Details are outlined in the new wiki!

We also introduce a new work-stealing scheduler. The work-stealing scheduler can be accessed via DotMP.Schedule.WorkStealing, and has been seamlessly integrated into the rest of DotMP. Details are also outlined in the new wiki.

Performance Improvements

There have been minor performance improvements across the board with parallel-for loops. However, collapsed for loops in 2D and 3D see substantial performance improvements, over 3x in some of my benchmarks. Static scheduling sees a performance bump as well from better avoidance of false sharing issues.

Bug Fixes

Prior to this release, if an exception was thrown from inside a parallel region, it could not be caught from outside the region. Now, exceptions thrown inside parallel regions are properly caught and re-thrown in serial space, allowing for try/catch blocks to be thrown around a parallel region and catch exceptions that happen in parallel space.

Planned Improvements

Before DotMP v1.6.0 is fully released, some more improvements are planned:

  • Fix issue where tasks can't call taskwait without a deadlock, which limits opportunities for recursive parallelism.
  • Optimize 4+ dimensional collapsed for loops.
  • Do in-depth performance tuning across the entire tasking subsystem.

What's Changed

Full Changelog: v1.5.0...v1.6.0-pre1

Contributors

computablee and dependabot
Assets 6
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