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Dave Anderson
@dave_universetf 5 years, 6 months ago 567 views

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Hooray, my IPv6 parser is mostly working, and only missing the final cursed case.

It's done. By god, it's done.

I mean, parseIPv6 is also awful and embarassing and much worse than the stdlib implementation right now. But is it at least faster than the stdlib?

Ope never mind, other tests are failing still. Bah.

lol, fuck. Not only is it 50% slower than the stdlib's parser, it's also not alloc-free.

oh, it's because it's benchmarking parsing a zone, and we have to intern the zone... I think.

Yess. For IPs without a zone, my parser is faster and alloc-free. Not hugely faster mind you.

I guess if you squint, it's about as good as the IPv4 parser. It has to touch 4x more bytes, so just under 4x slower isn't that bad.

That said, I'm pretty sure my code is a branch predictor's nightmare right now, not to mention it's entirely unreadable even by my low standards. Needs another round of improving, now that it passes tests.

I think it's time to checkpoint and play Elite Dangerous tonight, but the plan for tomorrow is to see if I can't turn this into a more explicit state machine, so that the code is considering fewer possibilities at any one time.

In general, I think all IPv6s parse in 4 stages:
- Hex before ellipsis
- Hex after ellipsis
- Embedded IPv4
- Zone suffix

All but the first are optional, and the conditionals to decide which new state to transition to is a bit ugly...

... But I think within each state the "happy loop" condition is simple and should keep the CPU and branch predictors pretty happy.

Current WIP, as I pack in for tonight to go play Elite: https://t.co/acwEFavxQi

WARNING: side-effects may include eye bleeding and stomach ulcers.

It also still has a bunch of debugging code in it, the comments may not match the code any more, and I haven't yet iterated on the benchmarks and SSA to see what hand-inlining was actually productive vs. harmful. So it's all hand-inlined, in the worst possible way.

The code's definitely not getting submitted like this, but that's my hacking process I guess :)

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$\u274cHarvey Staub \U0001f4aa\U0001f1fa\U0001f1f8\U0001f5a4\u2b50\ufe0f\u2b50\ufe0f\u2b50\ufe0f$

❌Harvey Staub 💪🇺🇸🖤⭐️⭐️...
@HarveyStaub1

1) Nashville bombing theory. So let’s go with this statement: “AT&T got the contract to do the forensic audit on the Dominion machines. Many are being transported to the Nashville location this week.” 👇

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@shreyas

A thread of resources for aspiring & new Product Managers:

(should also be useful for Eng, Design, Data Science, Mktg, Ops folks who want to get better at PM work or want to build more empathy for your PM friends ☺️)

(oh, and pls also share *your* favorite resources below)

👇🏾

1/

Product Management - Start Here by @cagan
(hard to go wrong if you start with Marty Cagan’s

2/

Tips for Breaking into PM by @sriramk
(I’ve recommended this thread in my DMs more often than any other thread, by a pretty wide

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It can seem non-obvious and differs with each company but here are some patterns I've seen work. All the below assumes you have no PMing on your resume.
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3/

Top 100 Product Management Resources by @sachinrekhi
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4/

Brief interruption.

It’s important to understand your preferred learning style and go all in on that learning style (vs. struggling / procrastinating as you force a non-preferred learning

There is no One Correct Way\u2122 to learn

Don\u2019t feel pressured to read 70 books/year just becos Super-Successful Person X does that

Videos, Podcasts, Audiobooks, Discussions\u2014all are fine

What to do:
Understand your preferred learning style
Don't resist it, embrace it
Commit to it
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Dave Anderson
@dave_universetf

In my quest to write a fast IPv4+6 parser, I have written a slow-but-I-think-correct parser, to use as a base of comparison.

In doing so, I have discovered more cursed IP address representations that I was previously unaware of.

A thread!

We start out simple, with IPv4 and IPv6 in what I'll call their "canonical form":

192.168.0.1
1:2:3:4:5:6:7:8

Various specs call these "dotted quad", dot-separated fields each representing 1 byte; and "colon-hex", colon-separated fields each representing 2 bytes.

The first bits of complexity come from IPv6. In canonical form, common addresses would end up with long runs of zeros in the middle. So, "::" allows you to elide 1 or more 16-bit blocks of zeros:

1:2::3:4 means 1:2:0:0:0:0:3:4

Next up, for cursed historical reasons, IPv6 permits you to write the final 32 bits of the address in dotted quad form. Effectively, you can splat an IPv4 address onto the end of IPv6 addresses!

1:2:3:4:5:6:77.77.88.88 means 1:2:3:4:5:6:7777:8888

And of course, you can combine the two!

fe80::1.2.3.4 means fe80:0:0:0:0:0:102:304

Francesco Ciulla
@FrancescoCiull4

One of my purposes for 2021 is to simplify Docker for beginners.

Let's start with some definitions:

🏠Docker host
⚙️Docker engine
❓ Docker client
📝Dockerfile
📑Docker Image
🐳Docker Container
🐙Docker Compose
🪣 Docker Registry
🐳🐳🐳Docker Swarm

Definitions Below 👇

🏠Docker (Active) Host

A computer with Docker installed and the daemon running.

It can process Docker and non-Docker workloads.

⚙️Docker Engine

A Client-Server application. It has 3 components:

- "daemon process": A server that is a type of long-running program.

- "Rest API": to specify interfaces that programs can use to talk and interact with the daemon.

- "CLI": A command-line interface client

❓Docker Client

It sends commands to dockerd, using the Docker API.
It can communicate with multiple daemons.

📝Dockerfile

It's a text document that contains all the commands a user could call on the command line to assemble an image.

Alex Kaplan
@AlKapDC

New from me, & my final piece of 2020:

In 2020, a false message board conspiracy theory harmed the pandemic response, significantly impacted our political process, & destroyed lives & families.

A deep dive into how QAnon's breakout year harmed us all:

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Rig Ved 1.36.7

To do a Namaskaar or bow before someone means that you are humble or without pride and ego. This means that we politely bow before you since you are better than me. Pranipaat(प्राणीपात) also means the same that we respect you without any vanity.

1/9

Surrendering False pride is Namaskaar. Even in devotion or bhakti we say the same thing. We want to convey to Ishwar that we have nothing to offer but we leave all our pride and offer you ourselves without any pride in our body. You destroy all our evil karma.

2/9

We bow before you so that you assimilate us and make us that capable. Destruction of our evils and surrender is Namaskaar. Therefore we pray same thing before and after any big rituals.

3/9

तं घे॑मि॒त्था न॑म॒स्विन॒ उप॑ स्व॒राज॑मासते ।
होत्रा॑भिर॒ग्निं मनु॑षः॒ समिं॑धते तिति॒र्वांसो॒ अति॒ स्रिधः॑॥

Translation :

नमस्विनः - To bow.

स्वराजम् - Self illuminating.

तम् - His.

घ ईम् - Yours.

इत्था - This way.

उप - Upaasana.

आसते - To do.

स्त्रिधः - For enemies.

4/9

अति तितिर्वांसः - To defeat fast.

मनुषः - Yajman.

होत्राभिः - In seven numbers.

अग्निम् - Agnidev.

समिन्धते - Illuminated on all sides.

Explanation : Yajmans bow(do Namaskaar) before self illuminating Agnidev by making the offerings of Havi.

5/9

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12 TRADING SETUPS which experts are using.

These setups I found from the following 4 accounts:

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2. @sourabhsiso19
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Share for the benefit of everyone.

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#OpenDrive #intradaySetup

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Few conditions needs to be met
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(1/n)
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Bactesting results of Open Drive

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#nifty

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See this thing that @lymanstoneky wrote:

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Here is a special thread introducing our series on “The Making of the Islamic World.” It offers 10 episodes about the transformation of Islamicate societies between the 7th and 17th centuries. You can find the series page here: https://t.co/7mL9eWmMmz

This is Chris Gratien posting. I created this series during Fall 2020 for my students as asynchronous material supported by readings and discussion. This is going to be a long thread, but it will be a great shortcut for those looking to make similar use of these materials.

There are two items worth pointing out: 1. This is an overview of the political, social, and cultural history of Islamicate societies. It does not deal with the origins of Islam or many theological questions. It does discuss Islam’s spread and the transformation of Islamic law.

2. This is the first part of a two-part sequence that takes the history of the Islamic world into the present. It emphasizes developments and themes that have particular relevance for later periods.

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