Hacker News: raviolo

New comment by raviolo in "I built a 516-panel financial terminal in 3 weeks using AI"

raviolo — Thu, 02 Apr 2026 00:22:21 +0000

As someone who never worked anywhere: what’s IB?

New comment by raviolo in "Storing Solar Energy as Ice for Air Conditioning"

raviolo — Mon, 23 Mar 2026 22:35:37 +0000

Don’t many CRE buildings do exactly this, and have been for years? As a notable example, Goldman building built in NYC over 10 years ago:

https://chenected.aiche.org/2014/08/goldman-sachs-new-deep-f...

New comment by raviolo in "Ultra-Low-Latency Trading System"

raviolo — Thu, 25 Dec 2025 23:16:57 +0000

CTO of an HFT firm here. My opinion: repo (and probably author’s comments) are LLM-generated. That said, many questions and techniques touched upon are real. So even though I certainly would not use any of these verbatim (as I wouldn’t do with any other LLM code), as a list of pointers for someone relatively new to the field this is actually pretty useful.

Saves you a “generate low-latency trading system” prompt anyway.

New comment by raviolo in "Ultra-Low-Latency Trading System"

raviolo — Thu, 25 Dec 2025 23:00:23 +0000

It does not. If this was the case, round trip wire to wire latency below 1.0-1.2 microseconds in software would’ve been impossible. But it clearly is possible - see benchmarks by Solarflare, Exablaze, and others.

New comment by raviolo in "A supersonic engine core makes the perfect power turbine"

raviolo — Wed, 10 Dec 2025 15:37:29 +0000

Is it a coincidence it’s 42 megawatts and not 41 or 43?

New comment by raviolo in "Ryanair flight landed at Manchester airport with six minutes of fuel left"

raviolo — Sat, 11 Oct 2025 13:16:24 +0000

They were most definitely IFR. Not because of the weather but because IFR is required above certain altitude 18,000 ft in the U.S. and typically lower in Europe (depends on a country). Jets including small private jets are almost always on IFR. Airliners with passengers - always.

Sinkclose Flaw in AMD Chips Allows Infections

raviolo — Fri, 09 Aug 2024 13:57:32 +0000

Article URL: https://www.wired.com/story/amd-chip-sinkclose-flaw/

Comments URL: https://news.ycombinator.com/item?id=41201892

Points: 21

# Comments: 2

Apple iCloud data loss – any suggestions?

raviolo — Fri, 13 Oct 2023 14:49:23 +0000

TLDR: lost large amounts of data in iCloud storage following frozen "iCloud Settings" window on Mac Sonoma 14.0.

Setup: two MacBooks, two iPads, and one iPhone all logged in to iCloud with the same ID, and all set up to sync "desktop & documents folders". Convenient - I can review code, documents, etc. while traveling and work from either MacBook (one is large, one is travel size).

Yesterday I notice that passwords are not syncing across devices - password change on macbook was not reflected on iPhone. I go it to iCloud settings on MacBook to check if sync is turned ON. For some reason it (iCloud Passwords & Keychain > Sync this Mac) shows sync turned OFF (it was definitely ON before). I move the slider to turn the sync ON; at this point the entire settings window just freezes. First time ever I had the window completely freeze on MacBook. I wait about 5 minutes and reboot the MacBook (reboot seems to work normally). After reboot, passwords do sync up and I think "all good".

Today I realize large amounts of data is gone from all iCloud on all devices. For example, here's all that's left of a large CPP project:

project_name cpp src CMakeLists.txt tools Dockerfile.el7

That's it - two files. Out of hundreds. I check all devices, also check iCloud Drive via web browser - same. Luckily this one's also in Git. But many other documents are not. I've been completely relying on iCloud for storage of personal documents for about a year now.

Google and ChatGPT seem to not be of much help. Apple support in progress but not much so far. I would greatly appreciate any suggestions. And in general, thoughts on reliability of iCloud primary (only?) storage of important documents?

Comments URL: https://news.ycombinator.com/item?id=37871251

Points: 4

# Comments: 1

New comment by raviolo in "Incident: Airbus A330 at Taipei, primary computers failed on touchdown (2020)"

raviolo — Sun, 05 Sep 2021 22:56:30 +0000

Don’t call me Shirley!

New comment by raviolo in "How fighter jets lock on, and how the targets know (2014)"

raviolo — Sat, 12 Jun 2021 22:53:27 +0000

For the confused (or to get more confused!):

https://youtu.be/bZe5J8SVCYQ

New comment by raviolo in "Yuri Gagarin: Sixty years since the first man went into space [video]"

raviolo — Tue, 13 Apr 2021 02:26:08 +0000

Russian propaganda does not say that. Putin himself said on multiple occasions that any theories of staging moon landings are silly. Don’t have a reference at the moment but I have seen several Putin’s interviews to that effect.

Russian propaganda is alive and well on many topics but denying American moon landings is not one of them.

New comment by raviolo in "Intruder at the top of the 20 meter amateur band?"

raviolo — Mon, 11 Jan 2021 22:50:52 +0000

One does not need a lot of bandwidth to trade successfully. In fact, a limited number of signals agreed upon ahead of time is enough. E.g. signal “A” could mean “buy 10 contracts”, signal “B” - “sell 100 contracts”, etc. And you can of course wrap 256 such signals into one byte. So transmitting a single byte at an opportune time let’s you control your trading on the other continent in a quite precise fashion. If you make such transmission, say, 10 times per day your bandwidth utilization is technically 10 bytes per day or about 0.001 bps - yet you can make a ton of money.

New comment by raviolo in "Intruder at the top of the 20 meter amateur band?"

raviolo — Mon, 11 Jan 2021 22:41:55 +0000

Could be these guys - they are publicly advertising Chicago to Europe data link via HF radio (for traders, of course):

https://www.raft-tech.com/

New comment by raviolo in "The Economics of Christmas Trees"

raviolo — Sun, 06 Dec 2020 21:39:59 +0000

Could be the same pilots who do cherry drying: https://youtu.be/UBe9GEhc7pE

New comment by raviolo in "How I Collected a Debt from an Unscrupulous Merchant"

raviolo — Sun, 06 Dec 2020 14:38:43 +0000

Respect and courtesy are nice but I think the reason this style is so effective is different. It makes the counterparty believe that you are collecting the paper trail to file a lawsuit. And behaving like you are preparing to file a lawsuit is much more effective than just claiming you will be filing a lawsuits.

I imagine that when presented with a choice of $88 payment or having to deal with a lawsuit, 100% of decision-makers will chose the former. And it’s not about the lawsuit outcome. Even if some complete garbage is filed which has no chance of success, the burden it creates on the business is clearly much higher than $88.

New comment by raviolo in "Show HN: Ugliest.app – Ugly but good app platform"

raviolo — Wed, 04 Nov 2020 21:27:21 +0000

Oh man. No protections against abuse for sure!

Google Chrome does not open files with spaces in name

raviolo — Thu, 22 Oct 2020 14:32:56 +0000

Article URL: https://support.google.com/chrome/thread/76204149?hl=en

Comments URL: https://news.ycombinator.com/item?id=24858426

Points: 1

# Comments: 0

New comment by raviolo in "Searchable PPP Loan Data"

raviolo — Wed, 08 Jul 2020 12:32:56 +0000

And I know a business owner who is shopping for a new house after getting a PPP “loan”. Sure, PPP money is supposed to be used for payroll. No problem, one can indeed use PPP money for payroll 100%. But then use the business revenue, 90% of which would normally be used for payroll, to take out a nice bonus and buy a house.

New comment by raviolo in "Searchable PPP Loan Data"

raviolo — Wed, 08 Jul 2020 02:28:54 +0000

Why do we pay taxes then if the government can just borrow that money?

New comment by raviolo in "Searchable PPP Loan Data"

raviolo — Wed, 08 Jul 2020 02:16:33 +0000

So, what if a business was successful, not impacted by covid, and wasn’t planning to lay off any employees anyway? Say, technology consulting company with 100 employees. Took out a PPP “loan”, which will be promptly forgiven since they keep the staff, who gets to keep the money? Something tells me 100% goes to business owner and 0% to employees.

I think there are quite a few companies like this. Hence “money goes to those who least need it”.