dima-quant
Joined 5 months ago
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26
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18
Member since
May 16
Recent submissions
Comment · 4 months ago
indeed, as far as I know, at this moment nimic is the only package that provides systems language functionality running in CPython, while the corresponding code also compiles AOT to an efficient native binary.
Comment · 4 months ago
Nice language with many built in features! Do you gain much in comparison to languages, where these concepts are implemented as frameworks? Not clear, how the memory management is implemented? Is it manual?
Comment · 4 months ago
The comparison with Cython is indeed very relevant as it is currently the standard for making Python modules and it has greatly improved support for the standard Python syntax over the last few years, e.g. the type hints. However, it still can not produce an executable independent from the Python runtime. Besides the manual memory management available in Cython, Nimic also provides deterministic memory management (ARC/ORC) rather than the Python's reference counting for the compiled code. Nim intermediate code is easier to debug than Cython produced C and the code can also compile to LLVM IR. I'm not an expert on Cython, does it have the modern systems language functionality at level it is present in Nim?
Comment · 4 months ago
Currently, Nim fits quite well with Python but there is a project to directly emit LLVM IR from Nim and MIR might be relevant there: https://github.com/arnetheduck/nlvm
Comment · 4 months ago
Your explanation is completely correct. There are Nim implementations of BigInt, but the foremost focus of Nimic is enabling as many standard Nim features as possible. In general, there is another parallel stream, which aims at implementing many Python features in Nim (both approaches can be combined, extending the Python subset covered by Nim implementation): https://github.com/nimpylib/nimpylib/wiki
Comment · 4 months ago
Fully fair, I'd need to spend more time on the text. The nimic was mostly tested on the raytracer project dima-quant/ndsl_raytracer, and the performance was indeed quite near the C-level.
Comment · 4 months ago
Not quite "all valid Python." Just to be clear: nimic is a strict, statically typed subset of Python. At this stage, the downside of having Nim as an intermediate step is not really a slower compilation, as Nim compiler is very fast, but more like:
debugging executable, might involve line numbers of the intermediate Nim or C source code;
the need to install Nim compiler for development;
memory management (currently it is ORC/ARC or manual in Nim, no borrow checker yet)
Comment · 4 months ago
Yeah, indeed, I actually read about mypyc a few years ago before starting nimic. Though the goal is very similar, mypyc does not support compilation to a native executable and the performance gains were somehow limited to 2x-4x, as reported in https://sichard.ca/blog/2022/05/compiling-black-with-mypyc-p...
Comment · 4 months ago
True, nimic is a statically typed Python subset without much of its dynamism with the aim to be foremost an efficient systems language. Though in nimic, without using isinstance, the instance-based dispatch is realised via variant types. Yes, emulating the Nim constructions in Python was the hardest part, while making the transpiler was straightforward.
Indeed, the AOT compilation leads to great speed-ups for heavy custom numeric calculations that cannot be easily vectorized in numpy, such as the raytracing logic. In cases when most of calculations are performed in an external module (written in e.g. C, Rust or Cython etc) the performance gain might be much less, but the added value here is that the high performance module itself can be written in nimic, keeping the codebase purely in Python and consolidating the codebase.
When starting with a "pythonic" code, rewrites in nimic can be substantial but so would be a rewrite in a systems language like C or Rust. Besides allowing to optimise the fast path, nimic provides low level functionality, such as pointers to pointers and bitwise operations that actually executes within CPython, for example, as in mp4 muxer implementation in dima-quant/ndsl_raytracer/src/nraytracer/minimp4.py
Comment · 4 months ago
Good suggestion, now I recall I heard about this project before. Good to see it is in active development.
Comment · 4 months ago
Yeh, indeed, the README was mostly generated, though the introduction is largely human-written :-) Is some specific description missing? I can provide more practical code examples directly in README. The benchmarks are mostly on runtime performance I assume?
Comment · 4 months ago
This is great, nice concept! Good use of coding agents. Now I can make diagrams much faster.
Comment · 4 months ago
nimic is a lightweight pure Python package that emulates Nim types and constructions, making it straightforward to transpile to Nim and compile AOT. Key principle: nimic code is valid Python that runs unmodified in CPython and also transpiles to equivalent Nim code.
Because nimic code is just standard Python with type hints and ctypes shims, it is a fully valid CPython script, so you can use the Python REPL during development, drop a breakpoint in the middle of a heavy algorithmic loop and inspect the variables natively.
Zero Lock-In: You don't need a special runtime engine. If the Nim compiler is not available, your script still runs (albeit slower than standard Python due to some emulation overhead) on any machine with Python installed.
Seamless Distribution: You can use this to develop high-performance logic natively in Python, debug it with Python tooling, and then compile to a native executable or C-extension via Nim.
Why Nim? Its syntax maps well to Python, it is rather clear how to emulate its constructions in Python, and its performance is comparable to C (as it compiles to C). Port of the "trace-of-radiance" Nim project to nimic can be found in "ndsl_raytracer" in my GitHub repo (dima-quant). With the compiled executable the render time for a single 512x288 scene dropped from many hours in Python to just 10 minutes on a single M1 CPU core. The repo also includes nimic ppm to mp4 converter.
Similar projects: - Pyccel (https://github.com/pyccel/pyccel): Python extension language using accelerators - SPy (https://github.com/spylang/spy) is a variant of Python specifically designed to be statically compilable while retaining a lot of the "useful" dynamic parts of Python. - Codon (https://github.com/exaloop/codon) is a high-performance Python implementation that compiles to native machine code without any runtime overhead.
It is still work in progress, e.g. there is no JIT and multiprocessing support yet, but now I'm not sure what functionality would be best to implement next. Any suggestions?