Implement Caching

[jan-janssen]

Summary by CodeRabbit

Release Notes

• New Features

  • Introduced a cache_directory parameter for the Executor class and create_executor function, allowing users to specify a directory for caching files.
  • Enhanced task execution with caching capabilities in the ExecutorBase and its subclasses.

• Bug Fixes

  • Improved error handling during task execution.

• Tests

  • Added new tests to evaluate caching behavior and performance in MPI operations.

[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

The changes introduce a new optional parameter, cache_directory, to the Executor class and related functions across multiple files in the executorlib module. This parameter allows users to specify a directory for storing cache files, enhancing the caching functionality of the executors. The modifications include updates to method signatures and the integration of the new parameter into existing logic, ensuring that caching is effectively utilized during task execution and executor creation.

Changes

File	Change Summary
executorlib/__init__.py	- Added cache_directory parameter to Executor class's __init__ and __new__ methods.
	- Updated method signatures to include cache_directory: Optional[str] = None.
executorlib/interactive/__init__.py	- Added cache_directory parameter to create_executor function.
	- Updated executor_kwargs to include cache_directory.
executorlib/shared/executor.py	- Modified execute_parallel_tasks to include cache_directory parameter.
	- Added _execute_task and _execute_task_with_cache functions for task execution with caching.
	- Streamlined error handling in task execution.
tests/test_executor_backend_mpi.py	- Added mpi_funct_sleep function for simulating delays in MPI context.
	- Introduced TestExecutorBackendCache class with tests for caching behavior.

Possibly related PRs

• Automatically set hostname_localhost #433: Modifies the hostname_localhost parameter in the Executor class, relevant due to updates in the constructor and __new__ method.
• Move cache functionality to shared #434: Introduces modifications related to caching functionality, aligning with the main PR's addition of the cache_directory parameter.

🐇 In a world of tasks and queues,
A cache directory we now choose!
With every run, our time we save,
In rabbit holes, we boldly brave.
So hop along, let’s execute,
With caching magic, we’ll compute! 🐇✨

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