cauldron
prvhash
cauldron | prvhash | |
---|---|---|
25 | 16 | |
117 | 297 | |
- | - | |
1.2 | 7.2 | |
about 1 year ago | 4 months ago | |
C | C | |
MIT License | MIT License |
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cauldron
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Many floating-point numbers are in the interval (2017) [0,1]
I've previously written an algorithm that generates random floats in any [a,b], which can generate all possible floating point values, including subnormals, with the proper probability, and does so quickly for any choice of a and b. [0]
[0] https://github.com/camel-cdr/cauldron/blob/main/cauldron/ran...
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Let's implement buffered, formatted output
The major advantage here is that you don't need to parse a dsl, and you can still have formatting options. A final api would probably use automatic compound literal struct arguments to implement default arguments with names parameters.
Type detection should also be possible, although you would need to register all print functions in a global macro.
This is just a proof of concept: https://github.com/camel-cdr/cauldron/blob/main/ideas/fmt.c
This is just a proof of concept: https://github.com/camel-cdr/cauldron/blob/main/ideas/fmt.c
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SIMD-oriented Fast Mersenne Twister in C and non STD library discussion
It really depends on your use case, but I've written a header only PRNG library that might be interesting to you. I've also held a presentation about it, if you are interested in the specifics: "How computers generate random numbers (A guide for programmers)"
- C Posix complaint argument parsing in 42 loc, inspired by Duff's device
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Fast Approximate Gaussian Generator
I've put it through an adapted version of testgauss.c, and it passed the test.
- Single header argument parsing, inspired by plan9's arg(3), in 45 loc
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Designing a new PRNG (Jan 2021)
The entire romu-random.org family is faster than xoshiro256++, atleast in my benchmark:
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Fast (pseudo) RNG?
Now for the self promo: If you are interested in random number generation, check out my presentation on the topic: https://www.youtube.com/watch?v=VHJUlRiRDCY You can also check out my random number library: https://github.com/camel-cdr/cauldron/blob/main/cauldron/random.h
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How to Properly Benchmark C Code
For my benchmarking library, I use macros to tell the compiler not to optimize away a value, pre-running the benchmark to "warm up" the CPU/scheduler and calculate the average and deviation of multiple runs of the benchmark.
prvhash
- Proof_Math_Is_Engineered: never-seen-before mind-blowing imagery discovered, with "original sin" consonants (for a layman)
- What Are Your Thoughts on This Claim To Have Discovered Mathematical Evidence for God?
- Is this guy even talking about anything?
- Proof_Math_Is_Engineered: 24-bit color imagery obtained
- Proof Math Is Engineered?
- Proof Math Is Engineered
- New Voxengo Span Update will be transcendental!
What are some alternatives?
mersenne-twister-predictor - Predict MT19937 PRNG, from preceding 624 generated numbers. There is a specialization for the "random" of Python standard library.
komihash - Very fast, high-quality hash function, discrete-incremental and streamed hashing-capable (non-cryptographic, inline C/C++) 26GB/s + PRNG
frand - A fast userspace CSPRNG
wyhash - The FASTEST QUALITY hash function, random number generators (PRNG) and hash map.
Criterion - A cross-platform C and C++ unit testing framework for the 21st century
STC - A modern, user friendly, generic, type-safe and fast C99 container library: String, Vector, Sorted and Unordered Map and Set, Deque, Forward List, Smart Pointers, Bitset and Random numbers.
pthash - Fast and compact minimal perfect hash functions in C++.
dieharder - A fixed version of Robert G. Brown's "dieharder" tests for random number generators.
JohnTheRipper - John the Ripper jumbo - advanced offline password cracker, which supports hundreds of hash and cipher types, and runs on many operating systems, CPUs, GPUs, and even some FPGAs [Moved to: https://github.com/openwall/john]
jonesforth - Mirror of JONESFORTH
ZedmeeHash - Strong, fast, simple, non-cryptographic hash function