Feature/task bench support

[guptapratykshh]

Fixes #4274

Proposed Changes

• added the full task-bench benchmark suite under examples/task_bench to evaluate runtime performance
• implemented the hpx driver using hpx::experimental::for_loop and fork_join_executor for efficient task graph execution
• integrated the benchmark into the main cmake build system so it builds with HPX_WITH_EXAMPLES=ON

Any background context you want to provide?

Checklist

Not all points below apply to all pull requests.

• I have added a new feature and have added tests to go along with it.
• I have fixed a bug and have added a regression test.
• I have added a test using random numbers; I have made sure it uses a seed, and that random numbers generated are valid inputs for the tests.

[StellarBot]

Can one of the admins verify this patch?

[hkaiser]

@guptapratykshh Did you implement the HPX version of task_bench?

[guptapratykshh]

Yes, i am working on HPX implementation, utilizing hpx::execution::experimental::fork_join_executor to efficiently handle intra node parallelism for task graph

[hkaiser]

Yes, i am working on HPX implementation, utilizing hpx::execution::experimental::fork_join_executor to efficiently handle intra node parallelism for task graph

Thanks! The only thing I'm unsure of is whether we really should add the whole task_bench code base to our repository. Wouldn't it be better to upstream your changes to them?

[guptapratykshh]

@hkaiser, you are right, i have upstreamed the implementation to task bench - StanfordLegion/task-bench#101
once that is merged, i will update this pr to remove duplicated task bench code from HPX and add minimal example that uses task bench as an external dependency

[hkaiser]

@guptapratykshh I'm going to close this without merging. Please re-open if you feel that we will pursue this PR any further.

[guptapratykshh]

@hkaiser now we should re-open this PR as this StanfordLegion/task-bench#101 is merged as well as the race condition(StanfordLegion/task-bench#94 (comment)) has also been fixed in that PR

[hkaiser]

@guptapratykshh when pushing to this PR, please remove the task-bench code by force-pushing to remove it completely from the git history.

[codacy-production]

Up to standards ✅

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[Copilot]

Pull request overview

Adds TaskBench benchmark support to the HPX examples by integrating an external TaskBench checkout and building HPX TaskBench driver executables as part of the examples build.

Changes:

• Introduces examples/task_bench CMake logic that fetches TaskBench and builds the core library + HPX driver executables.
• Adds task_bench to the top-level examples subdirectory list so it is built when examples are enabled.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 8 comments.

File	Description
examples/task_bench/CMakeLists.txt	Fetches upstream TaskBench and defines build targets for TaskBench core + HPX drivers.
examples/CMakeLists.txt	Registers task_bench as an examples subdirectory.

[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 5 comments.

[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.