rostayob

12 ms·

31.
by rostayob 4y ago
It could be that when splicing to /dev/null (which I'm doing), the kernel knows that they their content is never witnessed, and therefore no copy is required. But I haven't verified that
32.
by rostayob 4y ago
Yes, this all makes sense, although like everything splicing-related, it is very subtle. Maybe I should have mentioned the subtleness and dangerousness of splicing at the beginning, rather than at the end. I still think the man page of vmsp
33.
by rostayob 4y ago
Actually, from re-reading the man page for vmsplice, it seems like it _should_ depend on SPLICE_F_GIFT (or in other words, it should be safe without it). But from what I know about how vmsplice is implemented, gifting or not, it sounds like
34.
by rostayob 4y ago
(I am the author of the post) I haven't digested this comment fully yet, but just to be clear, I am _not_ using SPLICE_F_GIFT (and I don't think the fizzbuzz program is either). However I think what you're saying makes sense
35.
by rostayob 4y ago
It's not written in perl, it's written in C, and it uses splice() (one of the syscalls discussed in the post).
36.
How fast are Linux pipes anyway?(mazzo.li)
698 points by rostayob 4y ago|200 comments
37.
Xournalpp++ – closs-platform, open source note taking software(xournalpp.github.io)
199 points by rostayob 4y ago|87 comments
38.
Programming Parallel Computers(ppc.cs.aalto.fi)
15 points by rostayob 5y ago|2 comments
39.
Since 2021-09-15 Nixpkgs has merged ~17k PRs(twitter.com)
1 points by rostayob 5y ago|1 comments
40.
How Goedel's Proof Works(quantamagazine.org)
3 points by rostayob 5y ago|0 comments
41.
Building a quality USB-C microphone(youtube.com)
1 points by rostayob 5y ago|1 comments
42.
Epic Megagrant to Develop SDL Next-Gen Rendering API(patreon.com)
4 points by rostayob 5y ago|0 comments
43.
How to Build an Igloo(youtube.com)
1 points by rostayob 5y ago|0 comments
44.
Factorio in Lieu of Resumes(twitter.com)
3 points by rostayob 5y ago|0 comments
45.
by rostayob 5y ago
I've been using this script for years, and it works great: https://mazzo.li/posts/autoscreen.html It's very much like eternal terminal, but requires no upfront setup apart from having screen installed on the
46.
Mimalloc: Free List Sharding in Action [pdf](microsoft.com)
3 points by rostayob 5y ago|0 comments
47.
Backing up WhatsApp data through the multi-device web client(mazzo.li)
3 points by rostayob 5y ago|0 comments
48.
Remote, encrypted ZFS storage server with NixOS(mazzo.li)
5 points by rostayob 5y ago|1 comments
49.
by rostayob 5y ago
Thanks for the info. By the way, your writing on floating point arithmetic is very informative -- I even cite a message of yours on FMA in the post itself!
50.
by rostayob 5y ago
Ah, regarding edge cases: the only edge cases I do not handle are infinities and the origin. In my case these are both uninteresting: we deal with points from panoramic images, so those both make no sense. I did want to deal with 0s in eith
51.
by rostayob 5y ago
(I'm the author) You're right, I should have specified -- it is glibc 2.32-48 . This the source specifying how glibc is built: https://github.com/NixOS/nixpkgs/blob/97c5d0cbe76901da0135b0... . I&#x2
52.
Speeding up atan2f(mazzo.li)
245 points by rostayob 5y ago|103 comments
53.
Beating the L1 cache with value speculation(mazzo.li)
157 points by rostayob 5y ago|53 comments
54.
by rostayob 5y ago
> The only option is when all TU are given at the same time to the compiler Exactly -- which is the case here. But implementing such a cross cutting implementation would probably be annoying, which is what I wanted to convey with > I
55.
by rostayob 5y ago
I am not advocating static. I'm advocating for looking at what the compiler outputs when surprising behavior is encountered. The example is extracted from a larger piece of code, and I reported the minimal case as-is. If anything, the
56.
by rostayob 5y ago
Thanks, that's good to know!
57.
by rostayob 5y ago
Yes, see last few paragraphs of the post, in which I also speculate why GCC doesn't infer that there is only one compilation unit.
58.
by rostayob 5y ago
Author here -- just to be clear, I agree that marking the variable as const is the "right" thing to do here. I reported the investigation as-is because removing a static declaration made the code slower, which I then narrowed down
59.
by rostayob 5y ago
Author here -- I agree that const is better. The perf difference I encountered was due to the static keyword though, which is why the blog post talks about that specific issue.
60.
When static makes your C code 10 times faster(mazzo.li)
201 points by rostayob 5y ago|108 comments

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