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Minor cleanup

release-the-gil-pt2
Bradlee Speice 2020-06-30 14:23:33 -04:00
parent 1b24d3d092
commit 44a314a401
1 changed files with 10 additions and 10 deletions
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_posts/2020-06-29-release-the-gil-pt.-2.md
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@ -22,12 +22,12 @@ techniques below for managing the GIL in a Python extension.
# Pybind11
The motto of [Pybind11](https://github.com/pybind/pybind11) is "seamless operability between C++11
and Python", and they certainly deliver on that. My experience was that it was relatively simple to
set up a hybrid project where C++ (using CMake) and Python (using setuptools) were able to
peacefully coexist. We'll examine a simple Fibonacci sequence implementation to demonstrate how
Python's threading model interacts with Pybind11.
and Python", and they certainly deliver on that. Setting up a hybrid project where C++ (using CMake)
and Python (using setuptools) could coexist was straight-forward, and the repository also works as
[a template](LINK HERE) for future projects.
The C++ implementation is very simple:
Just like the previous post, we'll examine a simple Fibonacci sequence implementation to demonstrate
how Python's threading model interacts with Pybind11:
```c++
#include <cstdint>
@ -61,9 +61,9 @@ std::uint64_t fibonacci_gil(std::uint64_t n) {
}
std::uint64_t fibonacci_nogil(std::uint64_t n) {
// Because the GIL is held by default, we need to explicitly release it here.
// Note that like Cython, releasing the lock multiple times will crash the
// interpreter.
// Because the GIL is held by default, we need to explicitly release it here
// to run in parallel.
// WARNING: Releasing the lock multiple times will crash the process.
py::gil_scoped_release release;
return fibonacci(n);
@ -74,8 +74,8 @@ Admittedly, the project setup is significantly more involved than Cython or Numb
those steps here, but the full project is available at [INSERT LINK HERE].
```python
# This number will overflow, but that's OK; our purpose isn't to get an accurate result,
# it's simply to keep the processor busy.
# The billionth Fibonacci number overflows `std::uint64_t`, but that's OK;
# our purpose is keeping the CPU busy, not getting the correct result.
N = 1_000_000_000;
from speiceio_pybind11 import fibonacci_gil, fibonacci_nogil