swift-corelibs-libdispatch VS ThreadPool

GCD/libdispatch is a fantastic approach to concurrency and you can build and install support for non-Apple operating systems:

https://github.com/apple/swift-corelibs-libdispatch

Here’s a simple echo server:

https://github.com/williamcotton/c_playground/blob/master/sr...

Here’s a simple multithreaded database pool:

https://github.com/williamcotton/express-c/blob/master/src/d...

One of the reasons is that libdispatch's I/O functions introduce extra dynamic allocations for internal queueing via `dispatch_async` ([0],[1],[2]) and from an API perspective of realloc-ing ([3]) an internally owned ([4]) buffer.

TigerBeetle, on the other hand, statically allocates all I/O buffers upfront ([5]), treats these buffers as intrusively-provided typed data ([6]) (no growing/owned buffers), and does internal queueing without synchronization or dynamic allocation ([7]).

[0]: https://github.com/apple/swift-corelibs-libdispatch/blob/469...

If you want iOS in particular, read the source of GCD itself.

And in C++ can also use this dead-simple header file for a nice high-level, modern threadpool using function objects (lambdas) for very easy parallelization of arbitrary tasks: https://github.com/progschj/ThreadPool

Depending on how sophisticated you are with C++ you might want to try to impress him by using multithreading. I like this simple library. It's only like a 100 lines of code in a single header, and it is very simple to use.

#!/usr/bin/env bash if [ ! -d kenlm ]; then git clone https://github.com/kpu/kenlm.git echo -e "\n" fi if [ ! -d openfst-1.6.3 ]; then echo "Download and extract openfst ..." wget http://www.openfst.org/twiki/pub/FST/FstDownload/openfst-1.6.3.tar.gz tar -xzvf openfst-1.6.3.tar.gz echo -e "\n" fi if [ ! -d ThreadPool ]; then git clone https://github.com/progschj/ThreadPool.git echo -e "\n" fi echo "Install decoders ..." python setup.py install --num_processes 4

For point 2, just use this if you're lazy: https://github.com/progschj/ThreadPool