couring

C++ program that uses C++20 Corotuines and io_uring. Implementation explained in the blog series

Requirements

You will need a Linux kernel version 5.1 or higher and have liburing installed. Your C++ compiler must support C++20 and coroutines.

Build

cmake -Bbuild -DCMAKE_BUILD_TYPE=Release
cmake --build build

Usage

Preparing the data

Download any OBJ file you want from the internet and put them in folder.

To make things interesting you'll need hundreds of them, you can duplicate a OBJ file switch with a bash one-liner

for i in {1..5000} do cp my_file.obj my_file_$1.obj done

Running

Once you have all obj files on disk you can invoke the tool by passing the directory containing them.

./build/couring /folder_containing_obj_files <implementation>

There are five different implementations of the algorithm:

--trivial: Single-threaded synchronous implementation

--thread-pool Multi-threaded synchronous implementation

--iouring Single-threaded asynchronous implementation using iouring

--coroutines asynchronous implementation with coroutines with iouring, parsing single-threaded

--coro-pool asynchronous implementation with coroutines with iouring, parsing multi-threaded

There is a convenience script that runs all implementations and times them:

> ./run_all build /folder_containing_obj_files
#########
Running trivial implementation
Processed 512 files.

real	0m0.419s
user	0m0.371s
sys	0m0.046s
#########
Running multi-threading implementation
Processed 512 files.

real	0m0.177s
user	0m0.599s
sys	0m0.026s
#########
Running iouring implementation
Processed 512 files.

real	0m0.368s
user	0m0.317s
sys	0m0.050s
#########
Running couroutines implementation
Processed 512 files.

real	0m0.339s
user	0m0.305s
sys	0m0.033s
#########
Running coroutines thread pool implementation
Processed 512 files.

real	0m0.230s
user	0m0.732s
sys	0m0.047s