Disclaimer: I'm one of the authors of sneller core. We have been working on this project for more than a year. It's has got neat AVX512-centered architecture and many neat tricks inside.
Readit Newswmu commented on Accelerated SQL for JSON with AVX512 (Golang) github.com/SnellerInc/sne... · Posted by u/wmu
There are many scary things in the world. But the scariest is the line "Hi, I have a quick question". :)
It's definitely going to be merged. Of course not in the RFC version, but Molnar didn't work on this for a year in three revisions for it to be thrown away.
It was already said by the author, that approx ~70% of patches can be applied independently in various part of the source tree. The rest has to be synchronised.
DuckDuckGo is also not good. Last week I switched to Bing and its results are surprisingly good.
wmu commented on You can't copy code with memcpy devblogs.microsoft.com/ol... · Posted by u/hyperrail
- It looks like a virus...
- But it's the antivirus!
:)
wmu commented on Bit Test and Reset vs. Compilers 0x80.pl/notesen/2021-12-2... · Posted by u/gbrown_
I took that into account, although it may not have been clear because I tried to describe it in words rather than code.
What I was suggesting was something like this (in pseudocode):
int previous_leftmost = 64;
while (mask != 0) {
leftmost = find_leftmost(mask);
mask ^= 1u << leftmost;
while (--previous_leftmost > leftmost)
func_false(previous_leftmost);
func_true(leftmost);
}Thanks, that's a really elegant approach.
wmu commented on Bit Test and Reset vs. Compilers 0x80.pl/notesen/2021-12-2... · Posted by u/gbrown_
Most architectures seem to have an instruction for finding the leftmost set bit in a word [1] and most major C/C++ compilers/libraries have a function for it [2].
I wonder how using that would compare?
You'd find the leftmost bit, invoke the func_true for that, and clear the leftmost bit.
Then loop finding the leftmost bit, invoking the func_false for the bits between the current leftmost bit and the previous leftmost bit, func_true for the leftmost bit, and then clear that bit.
I wouldn't expect it to be dramatically different, but it is trading test and clear on the off bits and a conditional branch off of the result for a loop calling func_false a predetermined number of times. One of those options might be a little faster than the other.
[1] https://en.wikipedia.org/wiki/Find_first_set#Hardware_suppor...
[2] https://en.wikipedia.org/wiki/Find_first_set#Tool_and_librar...
Author here. I cannot use BSR, because have to execute code for all bits, regardless their value. The range is: the last bit to the first with value 1. It's a non-obvious iteration schema. :)
wmu commented on English has been my pain for 15 years (2013) antirez.com/news/61... · Posted by u/Tomte
In continental Europe I have often been in a room with people from 10 different countries say Germany, France, Italy, Russia, Poland, India, China, Korea, England.
Everyone could understand each other's broken English with the exception that half of the people couldn't understand English guy.
What always puzzle me is the fact that the English doesn't consider that the room language isn't their mother tongue and they should also try to speak this universal dialect that everyone understands.
> In continental Europe I have often been in a room with people from 10 different countries say Germany, France, Italy, Russia, Poland, India, China, Korea, England. Everyone could understand each other's broken English with the exception that half of the people couldn't understand English guy.
The problem is that most people are not exposed to real-life English. It's either quite artificial language during classes or well spoken lines in movies. Words are spoken slower and clearer. Native speakers speak fast, use linking, colloquial language, multitude of idioms, phrasal verbs, and tons of stuff never ever touched during classes.
I use my own, simple CLI tool* (not only to track working hours, but also to track open source or hobby activiets). For many years I used Toggl, which is great and powerful - I just needed something that works offline.