spsc_queue
glibc
spsc_queue | glibc | |
---|---|---|
2 | 25 | |
35 | 1,228 | |
- | - | |
10.0 | 0.0 | |
over 4 years ago | almost 6 years ago | |
C++ | C | |
BSD 2-clause "Simplified" License | GNU General Public License v3.0 or later |
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spsc_queue
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Low latency queues in Rust ecosystem
I've been researching how low latency I can get with Rust and if there's anything already built. If I limit the question only to SPSC queues, it looks like crossbeam-channel is the most performant one and needs around 20ns per item. In comparison to e.g. https://github.com/Deaod/spsc_queue with almost 1ns/item (the linked queue is not implemented in Rust and only used as an example of what's physically possible). I don't see why we couldn't have something like that in the Rust ecosystem and am wondering if there are any other places to look for perf structures like that, other than Github or crates.io (or they live under a different tag). Also if I would go for a c++ queue, can somebody share the perf impact of calling it from Rust? Haven't done that yet.
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A collection of lock-free data structures written in standard C++11
Should be benchmarked against ->
https://github.com/Deaod/spsc_queue
If proven faster OK.. If not.. Well.. back to the drawing board.
glibc
- `Strlen` in Glibc
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How does sqrt() work in glibc?
I am writing a short paper for school and the topic is Fast Inverse Square Root and alternatives. One of the questions is how the sqrt-function is implemented in glibc. Here is the code of that function.
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A collection of lock-free data structures written in standard C++11
The code isn't the easiest to read but in glibc it seems that the syscall is only performed if waiter are detected in userspace during an unlock operation
https://github.com/lattera/glibc/blob/master/nptl/pthread_mu...
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Converting my new code (Bytearray2Float64) into 19 Programming Language
You might still not realize, but floats are a large topic. Have a look at eg. this implementation here: https://github.com/lattera/glibc/blob/master/stdlib/strtod_l.c
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Honest question about this "The byte order fallacy" blog post.
This is a nice write up, thank you. However, I'm stilling interpreting this as a "fun trick" rather than the common sense method for solving the problem. For example, looking at the source code for htonl() from glibc: https://github.com/lattera/glibc/blob/master/inet/htonl.c
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Dio deleted the tweet shortly after
Second of all: The horrifying truth is that there is no such thing as a canonical text representation for IPv4 (source) (and yes... I am indeed citing the failed attempt to standardize this as my source for it not being standardized). Authoritatively speaking, all possible (non-binary) representations are equally invalid. In fact, text address resolution is typically delegated to the OS kernel, so what constitutes a "usable" address is liable to vary depending on if you're using Linux, OSX, Windows, or Other.
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Discussion Thread
Optimized code gets really weird. The creators of strlen, for example, decided that iterating over each character to find the end was far too slow. So instead, they convert the character pointer into an int pointer and do bitwise manipulation with the int on two different magic numbers so they can check four/eight characters at once.
- Tengo una duda en algo C/C++
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How does jvm deal with syscalls
If you're using a cross-platform C compiler like gcc or clang, you're usually expected to switch to assembly. Here's the syscall instruction in glibc
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Math Functions with -nostdlib
Maybe you should include the math part of a libc statically with your code. glibc is one option, or dietlibc if you want it to be as small as possible.
What are some alternatives?
tlaplus - TLC is a model checker for specifications written in TLA+. The TLA+Toolbox is an IDE for TLA+.
DirectXMath - DirectXMath is an all inline SIMD C++ linear algebra library for use in games and graphics apps
fastapprox - Approximate and vectorized versions of common mathematical functions
openlibm - High quality system independent, portable, open source libm implementation
libjxl - JPEG XL image format reference implementation
nixpkgs - Nix Packages collection & NixOS
illumos-gate - An open-source Unix operating system
crux - General purpose bitemporal database for SQL, Datalog & graph queries. Backed by @juxt [Moved to: https://github.com/xtdb/xtdb]
Configurations - Configurations for Marlin Firmware
Cello - Higher level programming in C
multiversion-concurrency-control - Implementation of multiversion concurrency control, Raft, Left Right concurrency Hashmaps and a multi consumer multi producer Ringbuffer, concurrent and parallel load-balanced loops, parallel actors implementation in Main.java, Actor2.java and a parallel interpreter
concise-encoding - The secure data format for a modern world