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A deep dive into Rust and C memory interoperability

news.ycombinator.com Unknown 2025-12-13 23:12:20

“Memory oppresses me.” - Severian, The Book of the New Sun Interviewer: “What happens if you allocate memory with C’s malloc and try to free it with Rust’s dealloc, if you get a pointer to the memory from C?” Me: “If we do it via FFI then there’s a possibility the program may continue working (because the underlying structs share the same memory layout? right? …right?)” Now if you have any experience working with memory management, you know that this is a dangerous answer. But I didn’t know it a

Topics: 00 bytes free memory size

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Part 1: A Deep Dive into Rust and C Memory Interoperability

news.ycombinator.com Unknown 2025-12-14 23:12:20

“Memory oppresses me.” - Severian, The Book of the New Sun Interviewer: “What happens if you allocate memory with C’s malloc and try to free it with Rust’s dealloc, if you get a pointer to the memory from C?” Me: “If we do it via FFI then there’s a possibility the program may continue working (because the underlying structs share the same memory layout? right? …right?)” Now if you have any experience working with memory management, you know that this is a dangerous answer. But I didn’t know it a

Topics: 00 bytes free memory size

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Writing memory efficient C structs

news.ycombinator.com Tom Scheers 2025-12-23 03:32:23

29 July 2025 Writing memory efficient C structs by Tom Scheers A struct in C is the best way to organize your data so that you can easily use the data later in your program. However, there are a few caveats to C structures, mainly how their memory works. Our struct struct Monster { bool is_alive ; // Used to see whether or not the monster is alive int health ; // Health of the monster int damage_hit ; // Damage they deal per hit char name [ 64 ]; // Name of the monster with a max of 63 char

Topics: bool bytes health monster struct

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What's the Difference Between Megabits and Megabytes? Here's What You Need to Know

cnet.com See Full Bio 2025-12-26 03:00:00

Knowing how your home internet works may rely on understanding these two key terms: Megabits and Megabytes. Internet terminology is often maddeningly confusing. Case in point: Megabits and megabytes. Both refer to units of digital information, but the difference is subtle enough to cause plenty of confusion. Knowing the difference between the two terminologies can make all the difference when picking out an internet plan or figuring out how quickly you can download a file. Don’t worry -- we’ll c

Topics: internet mb megabits megabytes second

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Breaking the WASM/JS communication performance barrier

news.ycombinator.com Unknown 2025-12-25 04:11:31

In sledgehammer every operation is encoded as a sequence of bytes packed into an array. Every operation takes 1 byte plus whatever data is required for it. Each operation is encoded in a batch of four as a u32. Getting a number from an array buffer has a high constant cost, but getting a u32 instead of a u8 is not more expensive. Sledgehammer bindgen reads the u32 and then splits it into the 4 individual bytes. It will shuffle and pack the bytes into as few buckets as possible and try to inline

Topics: bytes getting operation reads u32

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I wasted weeks hand optimizing assembly because I benchmarked on random data

news.ycombinator.com Unknown 2025-12-29 06:40:01

Once upon a time I worked in the field of Java Optimizations. The target system was a distributed data processing platform that ran across hundreds of thousands of machines. At such scales, a 0.5% improvement would easily make up my salary going forward, and 2% was a good result for the half. That doesn’t mean it was easy. Never have I ever seen such a highly optimized Java codebase. Not before, not since. Every low hanging fruit had long since been picked clean. For example, there was minima

Topics: bit bytes need numbers use

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Making a Speedrun Timer in D

news.ycombinator.com Unknown 2026-01-20 15:14:02

How I made a speedrun timer in D I semi-recently played through the original Deus Ex, and enjoyed my time with it so much that I felt like getting into speedrunning it, which ended up with me having to create a custom speedrun timer that “injects” itself into the game in order to implement features such as auto-splitting and load time removal. This article details the rough journey I went through. It’s not super well structured, but I was sorely lacking resources such as this when I was implem

Topics: 00 bytes game map memory

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Serving a half billion requests per day with Rust and CGI

news.ycombinator.com Unknown 2026-01-31 06:16:36

In my previous post Serving 200 million requests per day with a cgi-bin, I did some quick performance testing of CGI using a program written in Go. Go works excellently for CGI programs, for many of the same reasons it works so well for CLI programs and system daemons. But, out of curiosity, I decided to do a bit more CGI testing with other languages. CGI is good technology, actually# There’s a misconception that because CGI is old or because many CGI scripts had security vulnerabilities, CG

Topics: 00 bytes cgi mean total

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Can an email go 500 miles in 2025?

news.ycombinator.com Unknown 2026-01-31 02:49:27

Once upon a time, there was a university president who couldn’t send an email more than 500 miles, and the wise sysadmin said that’s not possible, so the president said come to my office, and lo and behold, the emails stopped before going 500 miles. Has technology improved? Can we send an email farther than 500 miles in 2025? There’s a lot to the story that’s obviously made up, but if we fix the details so that it can happen, we can reproduce it. connect We need some code to do a nonblocking

Topics: bytes connect edu ping time

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Malwarebytes Antivirus Review 2025: Decent Software, Terrible Customer Service

cnet.com See Full Bio 2026-03-01 14:00:00

CNET’s expert staff reviews and rates dozens of new products and services each month, building on more than a quarter century of expertise. 7.0 / 10 SCORE Malwarebytes Antivirus Buy at Malwarebytes Score Breakdown Performance 8 /10 Security 9 /10 Customer Support 4 /10 Usability 7 /10 Value 5 /10 Features 9 /10 Pros Free malware scanning and browser safety tools Decent VPN Impressive privacy policies Excellent dark web monitoring tools Cons Free version doesn’t provide real-time protection

Topics: 10 antivirus data malwarebytes vpn

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Address bar shows hp.com. Browser displays scammers’ malicious text anyway.

arstechnica.com Unknown 2026-03-12 12:10:45

Not the Apple page you're looking for “If I showed the [webpage] to my parents, I don't think they would be able to tell that this is fake,” Jérôme Segura, lead malware intelligence analyst at Malwarebytes, said in an interview. “As the user, if you click on those links, you think, ‘Oh I'm actually on the Apple website and Apple is recommending that I call this number.’” The unknown actors behind the scam begin by buying Google ads that appear at the top of search results for Microsoft, Apple,

Topics: apple fake injected malwarebytes number

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Latest Tech News

A deep dive into Rust and C memory interoperability

Part 1: A Deep Dive into Rust and C Memory Interoperability

Writing memory efficient C structs

What's the Difference Between Megabits and Megabytes? Here's What You Need to Know

Breaking the WASM/JS communication performance barrier

I wasted weeks hand optimizing assembly because I benchmarked on random data

Making a Speedrun Timer in D

Serving a half billion requests per day with Rust and CGI

Can an email go 500 miles in 2025?

Malwarebytes Antivirus Review 2025: Decent Software, Terrible Customer Service

Address bar shows hp.com. Browser displays scammers’ malicious text anyway.

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