pypy
SortingNetworks | pypy | |
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7 | 6 | |
20 | 436 | |
- | - | |
5.2 | 9.0 | |
over 2 years ago | 4 months ago | |
C# | Python | |
MIT License | GNU General Public License v3.0 or later |
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For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
SortingNetworks
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NSA Cybersecurity Information Sheet remarks on C and C++.
On a side-note: I did an experiment to see whether C# could match C++ for vector-intensive computing: https://github.com/zvrba/SortingNetworks
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What are the hardest topics in C#/.NET you would like to know more/better?
Here's a concrete example of using pointers to access raw array memory and use SIMD intrinsics: https://github.com/zvrba/SortingNetworks
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i made std::find using simd intrinsics
And now, for the fun of it, you can try with sorting. I've already done the hard work in C# (AVX2 intrinsics): https://github.com/zvrba/SortingNetworks
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Show HN: Fast(er) Sorting with Sorting Networks
> I can't read C#
Not much different than C++...
> Do you generate the sorting network at compile time
No, except for power of two sizes up to 32. I experimented with run-time code generation (and compilation) for given sizes, but... the generated machine code has too long prologue and epilogue for that to be worth-while (though the sorting code itself is well optimized, as if directly compiled from source). That's also mentioned in "Benchmarks" section.
> What's your sorting network template?
See References.
> And probably related: how is vectorization used?
See the code. There's no template, the code is fully "dynamic" and adapts itself to array size. As for vectorization... it compares/swaps 8 ints/floats at once, with some swizzles to rearrange the elements. For sizes that are not power of 2, I use masked loads and stores and some extra logic for deciding which comparisons to skip. (I treat non-existing elements "as if" they were set to intmax or float infinity.)
This file https://github.com/zvrba/SortingNetworks/blob/master/Sorting... has it all.
> this week-end project
Sorry, can't read Rust. (Though it reminds me of days spent coding in Perl.) Most networks are not SIMD-friendly and the code as it's now is the 3rd iteration where I figured out how to best leverage SIMD to exploit the recursiveness and regularity in the network. (Not the least, no random memory accesses: only forward and backward loads and stores.)
Without SIMD, I don't think it'll be worth it, because network will also access the memory randomly (just as "standard" sort), and in addition it has worse algorithmic complexity.
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Fast(er) sorting with sorting networks, part 2
So recently I posted a link with code for fast sorting of int arrays. People wondered how they'd perform for large arrays (1M elements), and I conjectured they'd be way slower because of their algorithmic complexity. Turns out I was wrong, they're 3-6x faster for arrays of length up to 1M elements. Updated code and benchmarks are now available at https://github.com/zvrba/SortingNetworks
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Fast(er) sorting with sorting networks
The code (MIT license) is available here: https://github.com/zvrba/SortingNetworks
pypy
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NSA Cybersecurity Information Sheet remarks on C and C++.
Not always, for instance GraalVM or PyPy. Nowadays C is quite avoidable.
- ¿Es C++ inútil?
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Quoting - Advantages and Disadvantages
Python's AST is wildly complicated. Here is the AST for PyPy. There are 78 different classes. Each Python keyword has an AST class dedicated to it. So there's an If class, and there's an Import class, and there's a TryExcept class, etc. In Lisp, these concepts would all be represented by a single type, the cons cell, with different symbols in the car position.
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A Developer's Guide to Dogfooding
Meanwhile, the best know 'fast' Python jit is written in Python: https://github.com/mozillazg/pypy
- Broo you're still using C?? What do you use to program, a rock? LoL I can do whatever your code does, in just two lines. What do you say? Your 1947284 lines code is faster than my 2 lines code? Well, you should respect other people's preferences.
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Why are True and False integers in Python?
https://github.com/mozillazg/pypy/blob/py3.8/pypy/objspace/std/boolobject.py#L13
What are some alternatives?
static-sort - compile-time sorting networks in rust
Pyjion
std_find_simd - std::find simd version
Pyston - A faster and highly-compatible implementation of the Python programming language.
ikos - Static analyzer for C/C++ based on the theory of Abstract Interpretation.
Cython - The most widely used Python to C compiler
ASP.NET Core - ASP.NET Core is a cross-platform .NET framework for building modern cloud-based web applications on Windows, Mac, or Linux.
Stackless Python
JDK - JDK main-line development https://openjdk.org/projects/jdk
PyBoy - Game Boy emulator written in Python
temp-webapi-monolith-architecture
github-gitea-mirror - Simple Python Script To Mirror Repository From Github To Gitea