Code-used-on-Daniel-Lemire-s-blog
miri
Code-used-on-Daniel-Lemire-s-blog | miri | |
---|---|---|
24 | 122 | |
799 | 4,026 | |
- | 4.0% | |
9.4 | 10.0 | |
12 days ago | 4 days ago | |
C | Rust | |
- | Apache License 2.0 |
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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.
Code-used-on-Daniel-Lemire-s-blog
- Estimating Your Memory Bandwidth
- First 96-Core AMD Zen 4 Threadripper Tests Show Utter Domination over Intel
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Parsing time stamps faster with SIMD instructions
It's not bad at all https://github.com/lemire/Code-used-on-Daniel-Lemire-s-blog/...
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Under Linux, libSegFault and addr2line are underrated
A newline is missing in the example code. As given there's a segfault at line 5 not line 6.
However, the code at https://github.com/lemire/Code-used-on-Daniel-Lemire-s-blog/... shows it's indeed at line 6, because it has an extra newline after the '#include '.
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Best Websites For Coders
Daniel Lemire's Blog : Daniel Lemire's blog
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Technical Blogs You Recommend?
Dr. Daniel Lemire's blog: https://lemire.me/blog, covers lots of technical items on optimizations in various programming languages, Lemire's work is currently in use across a number of projects and he consistently delivers fantastic improvements, he usually accompanies these improvements with a blog post describing what he did. He also occasionally posts interesting Science and Technology links on various topics not limited to tech, but health and education as well.
- suggest some c language blogs....
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What are some cool modern libraries you enjoy using?
Nope, simdjson is originally from Daniel Lemire who also often blogs about fancy low level optimizations: https://lemire.me/blog/ I'm just a happy user :)
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Escaping strings faster with AVX-512
Added this pull request with some interesting results.
There's a copy of the loop used on the escape function inside the avx512_escape function [0]. Is it needed or just a copy and paste mistake? (I know nothing about vector instructions)
0: https://github.com/lemire/Code-used-on-Daniel-Lemire-s-blog/...
miri
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Rust: Box Is a Unique Type
>While we are many missing language features away from this being the case, the noalias case is also magic descended upon box itself, with no user code ever having access to it.
I'm not sure why the author thinks there's magic behind Box. Box is not a special case of `noalias`. Run this snippet with miri and you'll see the same issue: https://play.rust-lang.org/?version=stable&mode=debug&editio...
`Box` _does_ have an expectation that its inner pointer is not aliased to another Box (even if used for readonly operations). See: https://github.com/rust-lang/miri/issues/1800#issuecomment-8...)
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Bytecode VMs in Surprising Places
Miri [0] is an interpreter for the mid-level intermediate representation (MIR) generated by the Rust compiler. MIR is input for more processing steps of the compiler. However miri also runs MIR directly. This means miri is a VM. Of course it's not a bytecode VM, because MIR is not a bytecode AFAIK. I still think that miri is a interesting example.
And why does miri exist?
It is a lot slower. However it can check for some undefined behavior.
[0]: https://github.com/rust-lang/miri
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RFC: Rust Has Provenance
Provenance is a dynamic property of pointer values. The actual underlying rules that a program must follow, even when using raw pointers and `unsafe`, are written in terms of provenance. Miri (https://github.com/rust-lang/miri) represents provenance as an actual value stored alongside each pointer's address, so it can check for violations of these rules.
Lifetimes are a static approximation of provenance. They are erased after being validated by the borrow checker, and do not exist in Miri or have any impact on what transformations the optimizer may perform. In other words, the provenance rules allow a superset of what the borrow checker allows.
- Mir: Strongly typed IR to implement fast and lightweight interpreters and JITs
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Running rustc in a browser
There has been discussion of doing this with MIRI, which would be easier than all of rustc.
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Piecemeal dropping of struct members causes UB? (Miri)
This issue has been fixed: https://github.com/rust-lang/miri/issues/2964
- Erroneous UB Error with Miri?
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I've incidentally created one of the fastest bounded MPSC queue
Actually, I've done more advanced tests with MIRI (see https://github.com/rust-lang/miri/issues/2920 for example) which allowed me to fix some issues. I've also made the code compatible with loom, but I didn't found the time yet to write and execute loom tests. That's on the TODO-list, and I need to track it with an issue too.
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Interested in "secure programming languages", both theory and practice but mostly practice, where do I start?
He is one of the big brains behind Miri, which is a interpreter that runs on the MIR (compiler representation between human code and asm/machine code) and detects undefined behavior. Super useful tool for language safety, pretty interesting on its own.
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Formal verification for unsafe code?
I would also run your tests in Miri (https://github.com/rust-lang/miri) to try to cover more bases.
What are some alternatives?
FastPFor - The FastPFOR C++ library: Fast integer compression
cons-list - Singly-linked list implementation in Rust
farmhash - Automatically exported from code.google.com/p/farmhash
sanitizers - AddressSanitizer, ThreadSanitizer, MemorySanitizer
rust - Empowering everyone to build reliable and efficient software.
simonwillisonblog - The source code behind my blog
Rust-Full-Stack - Rust projects here are easy to use. There are blog posts for them also.
developer-roadmap - Interactive roadmaps, guides and other educational content to help developers grow in their careers.
rfcs - RFCs for changes to Rust
cheatsheets - Cheatsheets for web development - devhints.io
nomicon - The Dark Arts of Advanced and Unsafe Rust Programming