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Saved by @Alex1Powell

Porting vanilla (minimal external API usage, no SIMD, no threading) C++ code to work in the browser with emscripten and WebAssembly is amazingly simple now. The Emscripten docs are excellent, but here are some things that could speed up the process of getting started:

 1. Beware of code which does unaligned memory reads/writes (which "may be slow on some CPU architectures")
2. Test with -fsanitize=undefined -fsanitize=address
3. Link with "-s ALLOW_MEMORY_GROWTH=1" and "-s INITIAL_MEMORY=X", X is a multiple of 64k, allows the C++ heap to grow.
(I completely avoid unaligned memory reads/writes because when compiled to asm.js they "can fail silently".)
4. Link with "-s MALLOC=emmalloc" to reduce compiled size.
5. I usually test with -O1 because -O0 can take very long to load/execute.
6. For debugging link with -s DEMANGLE_SUPPORT=1 and -s ASSERTIONS=1
7. C++ printf() outputs to the Developer Console: Chrome Settings->More tools->Developer tools
8. If something crashes, try running in Firefox which may explain the error differently.
9. I use Web Server for Chrome for development:
https://t.co/3drLehhSlL
The C FILE I/O functions work, but on a virtual file system:
https://t.co/iyJyAAVBiu

You can package up individual files from a directory that gets preloaded before your module executes.
To wrap C++ functions, classes, types etc. to expose them to Javascript code, look for "EMSCRIPTEN_BINDINGS". It's quite slick and mostly automatic.
Reading an integer property on a Javascript object from C++:

const emscripten::val& srcBuffer;

unsigned int length = srcBuffer["length"].as();
Copying from a Javascript Uint8Array to a std::vector:
And the reverse: copying from a std::vector to a Javascript Uint8Array (which was sized in Javascript to be >= the size you want to copy):
To JavaScripte/WebAssembly wizards all of this is probably the most basic beginning stuff. However, to native C++ coders not very familiar with these technologies (like me), all of this takes a while to figure out.
I use "emcmake cmake ../" in my build directory, with my CMakeLists.txt file in the parent folder. It sets environment variables that CMake needs to use emcc (the compiler).
All the heavy lifting that I do (data compression, decompression, transcoding)- stuff that doesn't require external API access - is in C/C++. Pretty much everything else, like the UI, WebGL usage, etc. is written in Javascript.
WebAssembly SIMD is the tech you want to use for SIMD in the web world. Personally, I use the intrinsic function wrappers. Functionality wise it seems vaguely somewhere in between SSE v2 and v4.
Multithreading support is still the wild west. I wouldn't depend on it being available yet in all browsers:
https://t.co/hyK6E6Pvso
#emscripten #webassembly

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David Kaplan
David Kaplan
@depletionmode
Linux code injection paint-by-numbers.

Can we launch a process that looks one way to (superficial) auditors but is, in fact, entirely different? (Think process hollowing and the like on Windows).

Firstly, how are processes created and what does related auditing look like?

The most common pattern is fork() → execve(). Where the fork() syscall create a duplicate of the running process context and execve() overlays a copy of the target program onto that context.

After calling fork(), we’ll have two processes, the original one and a new - duplicated - one (with a new pid).

Control will return from fork() to both process instances. In the child process, the return value will simply by 0, in the parent it will hold the pid of the child.

Thus we can determine whether we are running in the child context and call execv() accordingly, while allowing the parent to continue.


Now, let’s take a look at where the auditing hooks lie. From calling execve(), we’ll eventually land up in exec_binrpm().
INTERNET
Alberto Gimeno \U0001f3f3\ufe0f\u200d\U0001f308\U0001f1ea\U0001f1f8\U0001f49c\U0001f90e
Alberto Gimeno 🏳️‍🌈🇪🇸💜...
@gimenete
I'm going to tell you a little bit how we work on features at GitHub. It's simple, but very powerful in my opinion. At GitHub we have a high performance culture.

We are deploying changes almost all the time while keeping the service running and the deployment failure ratio needs to be super low! We are constantly working on new medium/big features, we have frequent deploys and required peer reviews.

How do we know that big features are not conflicting with each other in functionality and in version control. How do we merge the work done in these non-trivial features? How do we do prevent peer reviews slow down our productivity?

With basically two things: split the work in small batches and feature flags. We don't have long-lived feature branches. We do very small changes all the time and deploy them.

We could split a feature in tens or hundreds of PRs, but until it is beta or GA, we don't expose it to users by using feature flags.
INTERNET
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Carlos E. Perez
Carlos E. Perez
@IntuitMachine
Chess may be a good analogy for explaining the difference between a descriptive model of reality and a generative model of reality.

A descriptive model of chess will describe the rules (i.e. initial setup, allowed moves, points per piece, objectives). This tells you how a chessboard might evolve and also narrows the combinations of realistic chess positions.

In contrast, a generative model involves the actual gameplay between competing players that follow the rules. It generates new styles and patterns. It establishes new strategies and tactics. It generates new openings, middle gameplay, and end game tactics.

A generative model is an evolutionary model that leads to emergent behavior. As a consequence, a master of chess is able to recall the layout of chess positions in a real game in an instant, yet is unable to remember pieces placed in random positions.

That is because causality is present in the movements of pieces in a chessboard. An intuitive system like the human mind is able to capture that causality as a means to understanding and recall.
INTERNET
Dusk @ it's 2021
Dusk @ it's 2021
@nekoromancy
I am seeing a ton of confusion about protecting yourself on the Internet. So as a retired bastard genius kid, I wanted to share my own experiences and knowledge in this.

DOXXING, PERSONAL CYBERSECURITY, ANONYMITY for the average revolutionary. A thread:

If you're a regular user of huge Internet services like Amazon, Google, Twitter, Facebook, etc., as well as over the age of 18, it's wise to assume that your personally identifiable information IS attainable and IS out there. These services all collect and save info --

to varying degrees, and to varying levels of security. And this information is VALUABLE. Data breaches occur frequently, retroactively, and unknowingly, and the data from said breaches are circulated around and cached in all kinds of easy-to-access places online.

Why does this matter? A (simplified) hypothetical: while someone probably can't find your street address from just your Twitter bio, if your handle is the same as your e-mail, and that e-mail is in a publicly available data breach with a street address attached, you're screwed.

Usually when doxxing happens, a much more elaborate version of said case happens. Doxxing really comes down to investigating all of an individual's available info and digital footprints, and narrowing it down to a single identity.
INTERNET
Francesco Ciulla
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.
INTERNET

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Shaun Russell
Shaun Russell
@_ShaunRussell
"I really want to break into Product Management"

make products.

"If only someone would tell me how I can get a startup to notice me."

Make Products.

"I guess it's impossible and I'll never break into the industry."

MAKE PRODUCTS.

Courtesy of @edbrisson's wonderful thread on breaking into comics – https://t.co/TgNblNSCBj – here is why the same applies to Product Management, too.


There is no better way of learning the craft of product, or proving your potential to employers, than just doing it.

You do not need anybody's permission. We don't have diplomas, nor doctorates. We can barely agree on a single standard of what a Product Manager is supposed to do.

But – there is at least one blindingly obvious industry consensus – a Product Manager makes Products.

And they don't need to be kept at the exact right temperature, given endless resource, or carefully protected in order to do this.

They find their own way.
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David Rothkopf
David Rothkopf
@djrothkopf
Pretending that voting for Trump or denying climate change or suggesting the solution to every problem is more guns is a legitimate point of view, worthy of respect is not "how America works." It is how it dies.

People in a free society are entitled to any point of view no matter how obviously wrong or outlandish or destructive provided they do not impose their views on others.

But suggesting that something ignorant or divorced from reality warrants the same kind of treatment in public debate as something based in fact or at least credible is absurd and when done on behalf of a society in public media or academic settings it is self-destructive.

We would not grant media coverage or much bandwidth at all to a group that argued that unicorns exist or that there was a pot of gold at the end of the rainbow. Yet views like denying climate change or basing policy decisions on sweeping, obvious lies, are just as unsound.

Somewhere, somehow, judgments must be made. Some behaviors are wrong and must be condemned. Someone must challenge lies and demand facts. Coddling people who embrace idiocies does not help them no matter how loudly they demand to be coddled.
POLITICS
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Andrey \uf8ff Azimov
Andrey  Azimov
@AndreyAzimov
The best way to know if people like your product is NOT:

- Have a lot of emails in the waiting list
- Become #1 on PH
- Become #1 of HN or Reddit
- Have people that saing "I'll pay"
- Have a lot of free users

The best way to know if they're actually pay for it.

The only thing that matters is your product providing a value, and you can't know this until people will pay money for it.

We can have a first signal of a product/market fit after the launch by check how many sales we've got in the first 24h. Some scale:

200+ This has a high potential.
100+: This has a potential.
50+: Some people need it.
10+: People almost don't need it.
0+: People don't need it.

This is for a single time payment product. For a subscription probably it should be less because people hate subscription.

And obviously, you should have a lot of traffic like 3-5k+.

Here is a stat for my products (macOS apps) for the first 24h after the launch:
STARTUPS
\u092c\u094d\u0930\u093e\u0939\u094d\u092e\u0923\u094b\u0902 \u0915\u093e \u0907\u0924\u093f\u0939\u093e\u0938\U0001f441\ufe0f\U0001f441\ufe0f
ब्राह्मणों का इतिहास👁️...
@BRAHMIN_0052
MOHIYAL_BRAHMIN_KING
RAJA_PORUS
King_Porus_History

1)King Porus was a famous Indian king, his real name was #Purushotama. He belonged to PURU tribe mentioned in #RIG_VEDA, the Ancient books of India.


2) Porus ruled the Punjab region and expanded his kingdom between the Jhelum River and Chenab River in the Indian Subcontinent. He was a legendary warrior and more war skills. He made the army most powerful with war skills. Even Alexander had also made difficulty to defeat Porus.

3)Word of Mouth Oral tradition in #Mohyal_Brahmin families since ancient times has kept the Great Saga of their Great Elder known to them as Maharaja “ #Puru” alive.

4) When #Alexander the Great invaded India in 326 BC he was challenged near Taxila by a mere chieftain of the Area. He was King #Porus, a #Vaid_Mohyal. After his encounter with Porus, Alexander met with more resistance near Multan where the forces were predominantly #Mohyal.

5)The Bali rulers of Multan fiercely engaged with Alexander's army in skirmishes in which many senior Generals died. Later during the long and bitter fighting in #Multan, Alexander got hurt by an arrow which pierced his chest ,
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Nikita Poojary
Nikita Poojary
@niki_poojary
One of the most successful stock trader with special focus on cash stocks and who has a very creative mind to look out for opportunities in dark times

Covering one of the most unique set ups: Extended moves & Reversal plays

Time for a 🧵 to learn the above from @iManasArora

What qualifies for an extended move?

30-40% move in just 5-6 days is one example of extended move

How Manas used this info to book


Post that the plight of the


Example 2: Booking profits when the stock is extended from 10WMA

10WMA =


Another hack to identify extended move in a stock:

Too many green days!

Read
SCREENERS , A SCREENER