| Taskflow: A General-purpose Task-parallel Programming System

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Release 3.7.0 (2024/05/07)

Taskflow 3.7.0 is the 8th release in the 3.x line! This release includes several new changes, such as exception support, improved scheduling algorithms, documentation, examples, and unit tests.

# Download

Taskflow 3.7.0 can be downloaded from here.

# System Requirements

To use Taskflow v3.7.0, you need a compiler that supports C++17:

- GNU C++ Compiler at least v8.4 with -std=c++17
- Clang C++ Compiler at least v6.0 with -std=c++17
- Microsoft Visual Studio at least v19.27 with /std:c++17
- AppleClang Xcode Version at least v12.0 with -std=c++17
- Nvidia CUDA Toolkit and Compiler (nvcc) at least v11.1 with -std=c++17
- Intel C++ Compiler at least v19.0.1 with -std=c++17
- Intel DPC++ Clang Compiler at least v13.0.0 with -std=c++17

Taskflow works on Linux, Windows, and Mac OS X.

# Release Summary

This release introduces a new exception interface to help identify C++ errors in taskflow programs.

# New Features

## Taskflow Core

- Improved scheduling performance of dependent asynchronous tasks
- Improved scheduling performance of module task by removing busy looping
- Improved tf::Executor::wait_for_all using C++20 atomic wait
- Improved tf::Notifier using C++20 atomic wait
- Improved worker-thread ID mapping performance using C++20 atomic wait
- Added `-Wshadow` to the compilation check
- Added tf::AsyncTask::is_done to query the completion status of an async task
- Added tf::Taskflow::remove_dependency to remove dependencies from the graph
- Added support for exception in tf::Taskflow and tf::Executor

tf::Executor executor;
tf::Taskflow taskflow;
taskflow.emplace([](){ throw std::runtime_error("exception"); });
try {
executor.run(taskflow).get();
}
catch(const std::runtime_error& e) {
std::cerr << e.what() << std::endl;
}
tf::Executor
class to create an executor
Definition executor.hpp:62
tf::Executor::run
tf::Future< void > run(Taskflow &taskflow)
runs a taskflow once
tf::FlowBuilder::emplace
Task emplace(C &&callable)
creates a static task
Definition flow_builder.hpp:1738
tf::Taskflow
class to create a taskflow object
Definition taskflow.hpp:64

- Modified the CI to exclude exception test under sanitizers
- Modified the tf::PartitionerBase to allow defining custom closure wrappers

std::atomic<int> count = 0;
tf::Taskflow taskflow;
taskflow.for_each_index(0, 100, 1,
[](){
printf("%d\n", i);
},
tf::StaticPartitioner(0, [](auto&& closure){
// do something before invoking the partitioned task
// ...
// invoke the partitioned task
closure();
// do something else after invoking the partitioned task
// ...
}
);
executor.run(taskflow).wait();
tf::FlowBuilder::for_each_index
Task for_each_index(B first, E last, S step, C callable, P part=P())
constructs an index-based parallel-for task
tf::StaticPartitioner
class to construct a static partitioner for scheduling parallel algorithms
Definition partitioner.hpp:262

## Utilities

# Bug Fixes

- Fixed compilation error of CUDA examples caused by not including `for_each.hpp`
- Fixed the runtime error of tf::Taskflow::for_each_index when the range invalid

# Breaking Changes

- Renamed tf::Runtime::join to tf::Runtime::corun_all
- Removed tf::WorkerInterface due to the support of exception

# Documentation

- Revised Asynchronous Tasking with Dependencies
- Revised Exception Handling
- Revised Executor
  - Removed the section of tf::WorkerInterface
- Revised Partitioning Algorithm

# Miscellaneous Items

We have published Taskflow in the following venues:

- Cheng-Hsiang Chiu, Zhicheng Xiong, Zizheng Guo, Tsung-Wei Huang, and Yibo Lin, "An Efficient Task-parallel Pipeline Programming Framework," ACM International Conference on High-performance Computing in Asia-Pacific Region (HPC Asia), Nagoya, Japan, 2024
- Cheng-Hsiang Chiu, Dian-Lun Lin, and Tsung-Wei Huang,, "Programming Dynamic Task Parallelism for Heterogeneous EDA Algorithms," IEEE/ACM International Conference on Computer-aided Design (ICCAD), San Francisco, CA, 2023

Please do not hesitate to contact Dr. Tsung-Wei Huang if you intend to collaborate with us on using Taskflow in your scientific computing projects.