hashmash

12 ms·

91.
by hashmash 5y ago
I'm trying to find a good use case for records, but the best I can come up with is using it for composite hashmap keys. I suppose when combined with sealed classes and pattern matching features at some point it might be more useful, bu
92.
by hashmash 5y ago
Concurrency issues are a challenge, but a bigger problem is when designing a copy-on-write B-Tree, which is what I did. With such a design, any change to a node causes a replacement to be allocated, and then the pointer into it must be chan
93.
by hashmash 5y ago
The default limit is usually 25% of total physical memory. Should the default limit be the maximum? I think it's fine to have the default limit where it's at, to force me to think about what the actual requirements are. When you m
94.
by hashmash 5y ago
After watching this video, how many of us wrote a program to see if we could just randomly find a case which didn't converge? I wrote one, but of course, the program didn't prove the 3x+1 problem wrong.
95.
by hashmash 5y ago
What did you get nerve damage from? I assume it wasn't from the vaccines, but someone might infer this and point out a reason why we should avoid them.
96.
by hashmash 5y ago
The next blog post goes into more detail regarding possible optimizations. https://renato.athaydes.com/posts/how-to-write-slow-rust-cod... The JVM startup time is discussed, and it mentions that a pre-compiled version
97.
Show HN: Cojen/Maker – lightweight Java class generator designed for ease of use(github.com)
1 points by hashmash 5y ago|0 comments
98.
by hashmash 5y ago
Really? Why? It looks like a static image in the movie.
99.
by hashmash 5y ago
I don't think the Scanimate was used for this. This video shows a digital computer being used to create the animated trench sequence: https://www.youtube.com/watch?v=yMeSw00n3Ac
100.
by hashmash 5y ago
Not quite. The original green threads were seen as more of a hack until Solaris supported true threads. Green threads could only support one CPU core, and so without a major redesign, it was a dead end.
101.
by hashmash 5y ago
Even more amazing is that OS-9 was available for the "toy" Color Computer 15 years before multitasking became available for Windows or MacOS. The only thing preventing the CoCo from supporting safe multi-user interaction is an MMU
102.
by hashmash 6y ago
The inclusion of Java in the title is misleading: "For those coming from the Java world: there's no garbage collector in Ada, so objects allocated by the new operator need to be expressly freed." So really, you first need a
103.
by hashmash 6y ago
I'd like to understand what you mean by this. I'm no expert on Rust lock-free designs, but what are the "amortization guarantees" that you refer to? Is there something that I can read that explains this in greater detail
104.
by hashmash 6y ago
And even more misunderstood is the cost of exchanging state between CPU cores. A lockless algorithm can be just as slow (or even slower sometimes) than a lock based design simply because of contention at the hardware level.
105.
by hashmash 6y ago
Having direct control over this type of thing is important when updating the fields of a persistent data structure. I've had to deal with mistake before, where the original developer thought the layout matched what they specified, but
106.
by hashmash 6y ago
I guess beauty is in the eye of the beholder. When the iMac came out, my opinion was the same as yours -- absolutely beautiful design. Unfortunately, everyone copied the look (often quite badly), and now the original iMac looks tacky and d
107.
by hashmash 6y ago
The mRNA vaccines aren't currently being produced at a high enough volume. Having more types of vaccines available means more vaccinations are possible in a shorter period of time.
108.
by hashmash 8y ago
The LMDB test is a bit contrived. By choosing a key of 16 bytes and a value of 4000 bytes, it's nearly optimal. The underlying block device wants 4KiB aligned writes for best performance, and that's pretty much what this test is d