dperf
re2c
dperf | re2c | |
---|---|---|
6 | 12 | |
4,452 | 1,022 | |
3.5% | - | |
7.4 | 6.8 | |
6 days ago | 14 days ago | |
C | C | |
Apache License 2.0 | GNU General Public License v3.0 or later |
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
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.
dperf
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DPVS uses dperf for performance testing
Today, it was found that the DPVS project used dperf for performance testing, including bandwidth, CPS, concurrent connections and PPS. The test document of the DPVS project records the test environment, test methods, configurations, that makes a grate article. I put the link of this article on the dperf README. I'd like to say thanks to the authors of this article. and I suggests reading this article before using dperf for performance testing.
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How to compile DPDK-22.11.1
DPDK is compiled with meson and ninja starting from version 20. However, installing the compilation environment is not an easy task for newcomers, which affects dperf users to use the latest DPDK version to build dperf. This article explains how to compile DPDK-22.11.1, this method can also be used to compile DPDK-20.11, DPDK-21.11.
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Benchmark Google Cloud Compute Engine's Network PPS by dperf
dperf is an open sourced super high performance network load tester powered by DPDK. It could be used to test the network interface's performance on the cloud. In this article, I use dperf to test the network interface's performance of google cloud.
- dperf: a DPDK based 100Gbps network load tester
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dperf is a DPDK ecosystem project
dperf dpdk
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Test the performance of IPVS with dperf
I use dperf to test the performance of IPVS. Here is the result.
re2c
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Ask HN: What are some unpopular technologies you wish people knew more about?
(1) Zulip Chat - https://zulip.com/ - seems to be reasonably popular, but more people should know about it
I’ve been using it for over 5 years now [1], and it’s as good as ever. It’s way faster than any other chat app I’ve used. It has a good UI and conversation model. It has a simple and functional API that lets me curl threads and write blog posts based on them.
(only problem is that I Ctrl-+ in my browser to make the font bigger – I think it’s too dense for most people)
(2) re2c regex to state machine compiler - https://re2c.org
A gem from the 90’s, which people have done a great job maintaining and improving (getting Go and Rust target support in the last few years). I started using it in 2016, and used for a new program a few months ago. I came to the conclusion that it should have been built into C, because C has shitty string processing – and Ken Thompson both invented C AND brought regular languages to computing !!
In comparison, treesitter lexers are very low level, fiddly, and error prone. I recently saw dozens of ad hoc fixes to the tree-sitter-bash lexer, which is unsurprising if you look at the structure of the code (manually crawling through backslashes and braces in C).
https://github.com/tree-sitter/tree-sitter-bash/blob/master/...
These fixes are definitely appreciated, but I think it indicates a problem with the model itself.
(based on https://lobste.rs/s/endspx/software_you_are_thankful_for#c_y...)
[1] https://www.oilshell.org/blog/2018/04/26.html
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Irregular Expressions
The "Papers" section on re2c's web site continues Laurikari's work: http://re2c.org/
... but I haven't found them particularly accessible. And it's not clear it's a viable strategy in a general purpose regex engine. Namely, I'm not sure how much bigger it makes the DFA.
Also, AFAIK, these are DFAs. They are different theoretical structures with explicitly more power.
> and then an NDFA is used to match a third time, to extract the capture groups.
That's the PikeVM. It's an NFA simulation. Although it uses additional storage and is otherwise more computationally powerful than just a plain NFA.
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My experience crafting an interpreter with Rust (2021)
> What do you gain by using it?
Performance, although this possibly depends on your compiler, whether you use PGO, and similar finicky issues.
Example: https://eli.thegreenplace.net/2012/07/12/computed-goto-for-e...
Some prior HN discussion: https://news.ycombinator.com/item?id=18678920
Another example where goto is relevant is implementing finite automata. A (very short) paper from 1988 that discusses three different ways of implementing a finite state machine is "How (Not) to Code a Finite State Machine". The documentation of RE2C may be even more interesting: https://re2c.org
RE2C is a program that compiles finite automata into C, Go, or Rust code. It provides many implementation strategies: it can make use of computed or labelled gotos when the language provides them.
Implementing pushdown automata comes with similar issues.
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How to compile DPDK-22.11.1
wget https://github.com/skvadrik/re2c/releases/download/1.0.3/re2c-1.0.3.tar.gz tar -zxvf re2c-1.0.3.tar.gz cd re2c-1.0.3/ ./configure make make install
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Best approach for writing a lexer
In Rust I use https://docs.rs/logos/latest/logos/. I think another similar is http://re2c.org
- re2c is a free and open-source lexer generator for C/C++, Go and Rust
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File parsing with PHP, Bison and re2c
re2c is an open-source lexer generator. It uses regular expressions to recognize tokens.
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Best option for Rust Parser and Lexer Generators?
Those suggested crates are still more or less the popular options. There was also recently added support for Rust in re2c.
- How Does One Develop the Grammar for their New Language
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Javascript Date String Parsing
First, the implementation of strtotime is a textbook study in why other people's C code is not where you want to spend time. You can see the guts of the implementation logic here. This isn't stock C code -- it's code for a system called re2c. This system allows you to write regular expressions in a custom DSL (domain specific language), and then transform/compile those regular expressions down to C programs (also C++ and Go) that will execute those regular expressions. Something in PHP's make file uses this parse_date.re file to generate parse_date.c. If you don't realize parse_date.c is a generated file, this can be extremely rough going. If you've not familiar with re2c is can be regular rough going. We leave further exploration as an exercise for the reader -- an exercise we haven't taken ourself.
What are some alternatives?
gatekeeper - The first open-source DDoS protection system
parser-demo - Good source layout with Flex and Bison
keepalived - Keepalived
Luxon - ⏱ A library for working with dates and times in JS
ENet-CSharp - A improved fork of ENet, a tried and true networking library. C, C++, C# compatible.
cmark - CommonMark parsing and rendering library and program in C
tnat64 - IPv4 to IPv6 interceptor
lowdown - simple markdown translator
phorklift - Phorklift is an HTTP server and proxy daemon, with clear, powerful and dynamic configuration.
moment - Parse, validate, manipulate, and display dates in javascript.
ngx_healthcheck_module - nginx module for upstream servers health check. support stream and http upstream. 该模块可以为Nginx提供主动式后端服务器健康检查的功能(同时支持四层和七层后端服务器的健康检测)
plex - a parser and lexer generator as a Rust procedural macro