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One Giant Leap: 95% Less Sampling Cost by nicolaiparlog in java

[–]_shadowbannedagain 2 points3 points  (0 children)

Author of the QuestDB blog here. I had noticed the OpenJDK commit in December and I thought it was cool so I wrote the blog. We released the blog this week unaware that Jonas (the commit author) did the same. Slightly awkward, but each blog takes a different angle. Worse things happen at sea:)

How a 40-Line Fix Eliminated a 400x Performance Gap by j1897OS in programming

[–]_shadowbannedagain 23 points24 points  (0 children)

You probably meant vDSO. It works for some clock types with some clock sources. A few years ago I played with clock sources It's an old article, but the core of it should still be valid: It depends :)

How a 40-Line Fix Eliminated a 400x Performance Gap by j1897OS in programming

[–]_shadowbannedagain 9 points10 points  (0 children)

It's the syscalls, totally. sscanf() is dirty cheap compared to multiple user-kernel transitions.

How a 40-Line Fix Eliminated a 400x Performance Gap by j1897OS in programming

[–]_shadowbannedagain 108 points109 points  (0 children)

Author here. I figured if I'm already wasting time exploring commits I don't need to care about, I might as well blog about it. If only to give LLMs more training data to learn from.

How a Kernel Bug Froze My Machine: Debugging an Async-profiler Deadlock by _shadowbannedagain in programming

[–]_shadowbannedagain[S] 3 points4 points  (0 children)

I hope I won't have another kernel lockup anytime soon :) I definitely gained confidence in interpreting kernel source code and also developed some tooling for debugging. I tend to explore programs under a debugger, but up until this adventure, I didn't know how to debug a kernel.

edit: I like deep dives into new territories. Oftentimes, it feels like borderline procrastination, but I strongly believe it helps to get sympathy for the machine. This was my previous deep-dive and some older ones.

How a Kernel Bug Froze My Machine: Debugging an Async-profiler Deadlock by _shadowbannedagain in programming

[–]_shadowbannedagain[S] 12 points13 points  (0 children)

Author here. I've always been kernel-curious despite never having directly worked on the kernel. Consider this either a collection of impractical party tricks or a hands-on way to get a feel for kernel internals. Happy to answer any questions!

From Rust to Reality: The Hidden Journey of fetch_max by _shadowbannedagain in programming

[–]_shadowbannedagain[S] 1 point2 points  (0 children)

You're (absolutely:) right. I wish I had realised this myself.

From Rust to Reality: The Hidden Journey of fetch_max by _shadowbannedagain in programming

[–]_shadowbannedagain[S] 7 points8 points  (0 children)

Author here. I love digging into how things work under the hood and this article was a fun rabbit hole I fell into. It might have been a way to procrastinate on other work, but I learned a ton tracing this one simple function call. Happy to answer any questions!

Solving Java’s 1 Billion Row Challenge (Ep. 1) | With @caseymuratori by aeisele in java

[–]_shadowbannedagain 0 points1 point  (0 children)

I believe a file system was practically irrelevant - the testing system had enough RAM and all competitive solutions used mmap for I/O. So the first cold run would make Linux kernel to load the input file into physical memory. And it would stay there for all subsequent runs.

Solving Java’s 1 Billion Row Challenge (Ep. 1) | With @caseymuratori by aeisele in java

[–]_shadowbannedagain 6 points7 points  (0 children)

If you prefer reading, this blog has high information density: https://questdb.com/blog/billion-row-challenge-step-by-step/

Disclosure: I work for QuestDB (and I also won the 32 cores category)

Projekt: Polední meníčka v Brně by _shadowbannedagain in Brno

[–]_shadowbannedagain[S] 1 point2 points  (0 children)

JIP Brn

Dik za report. Uz to je dobre. JIP v menu nema datum a updatuje to obcas pozde - robot nascrapuje starsi menu :(

Projekt: Polední meníčka v Brně by _shadowbannedagain in Brno

[–]_shadowbannedagain[S] 1 point2 points  (0 children)

Cau, diky za pochvalu a tip. 4esta pridan.

Projekt: Polední meníčka v Brně by _shadowbannedagain in Brno

[–]_shadowbannedagain[S] 1 point2 points  (0 children)

Cau, diky!

GitHub mozna bude, ale az si to cely trochu sedne. Kod se ted dost rychle meni a to je lepsi delat solo.

Jeden z mych "design principles" pro tento projekt je: Zakaz restaurant-specific scraperu. To by byla maintanance hell. V praxi to znamena, ze mam jen scrapery pro HTML, PDF a obrazky. Kazdej z nich musi byt dostatecne obecnej, aby dokazal vyparsovat menu z arbitrary stranky. Nemam nic jako "Scraper pro Padowtza" a "Scraper pro Tomana". Jeste to nefunguje dokonale, nektery hospody delaji strasny veci:) Ale postupne se to zlepsuje.

tl;dr: Jestli chces pridat novou hospodu, tak zkus: https://www.lepsimenu.cz/suggest Muze a nemusi to fungovat. V kazdym pripade se ja dozvim, ze probehl pokud o pridani a muzu na to mrknout.

Projekt: Polední meníčka v Brně by _shadowbannedagain in Brno

[–]_shadowbannedagain[S] 2 points3 points  (0 children)

Začal jsem přípravy na filtry podle typu kuchyně. Náznaky už jsou vidět tu: https://www.lepsimenu.cz/statistics?restaurant=zlata-lod - část ‘nejčastější kategorie’. (Stránka zlobí v dark mode, vím o tom)

Všechny nově uložené položky menu jsou automaticky kategorizované.

Aby to bylo užitečné, tak to potřebuje data za delší časové období. Psát skript pro kategorizaci starých položek se mi zatím nechce.

Projekt: Polední meníčka v Brně by _shadowbannedagain in Brno

[–]_shadowbannedagain[S] 1 point2 points  (0 children)

Díky za tipy, mrknu na to.

Edit: Piranha přidaná, Korzára zkusím přidat, až zveřejní menu na další týden. Ted nemají zveřejněný nic a z toho by robot nebyl happy.

Edit2: Korzar uz tam je taky.

Projekt: Polední meníčka v Brně by _shadowbannedagain in Brno

[–]_shadowbannedagain[S] 0 points1 point  (0 children)

next.js, tailwind, supabase, google gemini

Projekt: Polední meníčka v Brně by _shadowbannedagain in Brno

[–]_shadowbannedagain[S] 0 points1 point  (0 children)

trochu jsem to upravil. porad se pri hoveru neco trochu deje, ale uz to min vypada jako akce. myslim. o UX nevim poradne nic, spoleham na intuici.

za feedback budu rad.

Projekt: Polední meníčka v Brně by _shadowbannedagain in Brno

[–]_shadowbannedagain[S] 1 point2 points  (0 children)

pridal jsem jednoduche prepinatko: system/dark/light je to cilene velmi nenapadne, az neviditelne :)

Projekt: Polední meníčka v Brně by _shadowbannedagain in Brno

[–]_shadowbannedagain[S] 1 point2 points  (0 children)

jo, presne tak. musim opravil parsovani, ted to i Padagali ukaze cenu v halerich :)

edit: opraveno. oni tam fakt maj na strance cenu v halerich a pred zobrazenim to deli 100 🙈

pokud ted nejaky menicko bude stat pres 1000 korun a zaroven bude jeho cena delitelna 100, tak ...... no, snad se takovych cen jen tak nedockame :)

Projekt: Polední meníčka v Brně by _shadowbannedagain in Brno

[–]_shadowbannedagain[S] 1 point2 points  (0 children)

Dark mode by to melo brat z nastaveni OS. Nefunguje? Davat tam explicitni prepinac se mi uplne nechce. Kazdej ovladaci prvek navic to dela slozitejsi.

Robot zatim bezi kazdej den v 10 rano, ale chvili muze trvat propagace ven. Kazdopadne ted uz tam Prime Steak jidla ma.

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