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virtuallynathan

1,282 karma · joined November 6, 2012

Starlink @ SpaceX; ex-Netflix, AWS. Software, systems, data, networking. Bike rides, hikes, nutrition/longevity, home servers, and more.

[ my public key: https://keybase.io/virtuallynathan; my proof: https://keybase.io/virtuallynathan/sigs/IDOpwbH4gBukWjVazS0iNXczg2eC5rN5j5R_OLORS94 ]

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virtuallynathan··on Nvidia Hopper GPU Architecture and H100 Accelerator
How does a DGX Pod w/ the new 3.2Tbps per machine NVLINK switch compare to Tesla Dojo?
virtuallynathan··on Xtraceroute (2009)
RIPE Atlas tries to do this using their IP Map. It sorta works. https://ipmap.ripe.net/
virtuallynathan··on A beginner's guide to intermittent fasting (2012)
> The surprising part was that it took the science guy 10 hours to calculate the calories for 5 food items ? Would be nice if we could get that down to minutes and accessible to personal consumers.

Bomb Calorimetery is a PITA, I almost did a startup around this. The researcher in the video has a fairly manual one, there are automated setups that reduce this time, but they still cost $40k+ and require oxygen tanks, etc.

The even more difficult case for calories is something like a steak: how marbled is it? I could see some computer vision approach working.

virtuallynathan··on A beginner's guide to intermittent fasting (2012)
I'm a nerd with more money than sense, what can I say! I trust the output of the device I have, and I do truly believe I am burning 3300kcal/day just standing at my desk, walking to the bathroom, etc. I eat 3500kcal/day pretty regularly, and maintain weight.

If you can target enough of a deficit and not be hungry, good for you. It's hard for most people. The input data is wrong, the output data is wrong/unknown, and one can only be hungry for so long.

virtuallynathan··on A beginner's guide to intermittent fasting (2012)
Do you know how many calories you burn? Do you actually know how many calories are in your food?

I have a metabolic cart, and the answer surprises me sometimes on the former - just standing at my desk all day I burn >3300kcal. I actually went to talk to the guy in the Casey Neistat video about food labels, and almost bought a bomb calorimeter. Calorie counting, while not useless, is not very helpful.

https://youtu.be/hE2lna5Wxuo

virtuallynathan··on Starlink uplink transmissions become beacons for airstrikes
Yes, the dish tends to change satellites every 15 seconds, targeting would probably be a nightmare.
virtuallynathan··on RIPE NCC executive board resolution on provision of critical services
RIPE doesn't really have the power to withdraw assigned IPs, the Russian ISPs can just keep announcing them. Perhaps they could break their RPKI data so their prefixes would be dropped as invalid by those checking signatures (I would consider this a misuse of RPKI), but they would still mostly work.
virtuallynathan··on Phenethylamines I have feared and loathed (2020)
Hamilton Morris has commented on this paradox of drugs...

People who take Amphetamines because they want more energy end up tired, etc.

virtuallynathan··on Phenethylamines I have feared and loathed (2020)
There's no other way to know what they'll do.
virtuallynathan··on Meta shares drop 20% on Q4 earnings miss, weak outlook
Now there's a real source! "Amazon Web Services owns 11.9 million square feet of property, leases 14.1 million square feet"

That's 26 million sq ft vs Facebook's 40.5 million.

virtuallynathan··on Meta shares drop 20% on Q4 earnings miss, weak outlook
Personal intel, I maintain a map and spreadsheet, combined with publicly available information and press releases.
virtuallynathan··on Starlink adds another 100Gbps connection to the SeattleIX
I follow Starlink's IP space and connectivity closely, if anyone is interested, see this: https://old.reddit.com/r/StarlinkEngineering/comments/ofly6k...
virtuallynathan··on Starlink adds another 100Gbps connection to the SeattleIX
Not anymore, customers are being migrated to AS14593. I'm one of em.. I'm in 170.203.91.0/24.
virtuallynathan··on Meta shares drop 20% on Q4 earnings miss, weak outlook
Based on my calculations, Facebook has more DC space/power than Google/Amazon/Microsoft. They have around 40 million sq ft of DC space, and likely ~5GW of power. They have 48 buildings in 18 locations, with 47 more under construction.

AWS Data centers are fairly small, ~180,000 sq ft or so generally, us-east-2 is about 900,000 sq ft. us-east-1 perhaps 8 million sq ft.

Google likely has more network capacity, but FB is catching up.

virtuallynathan··on Add 10 GbE to your system with an M.2 2280 module
100GbE NICs are <$500, and 100GbE switch ports are $100-150.
virtuallynathan··on Add 10 GbE to your system with an M.2 2280 module
I’ve never had this as a problem, and I use 50-100ft of Cat5e + 10GBaseT SFP+’s… it’s well within the thermal limits of the SFP, which probably uses 2-5W.
virtuallynathan··on Portable replacement for a $60k VO2 Max machine
The actual machines aren’t $60k anymore - I have a portable one, it was $5500. This is a very cool project to bring that down even more.
virtuallynathan··on We handle 80TB and 5M page views a month for under $400
Yep! All TLS.

The production boxes are 2U, but it can be done in a 1U box.

virtuallynathan··on We handle 80TB and 5M page views a month for under $400
At Netflix we’re doing close to 400Gbps on 1U commodity hardware, and pretty inexpensive.
virtuallynathan··on Subsea Cable to Connect Asia, Europe, and North America Through the Arctic
Arctic routes have been proposed for a long time, I hope this finally happens.

2014: https://spectrum.ieee.org/arctic-fibre-project-to-link-japan...

virtuallynathan··on The Amazon Empire Strikes Back
I’m not sure where he got the idea that these don’t exist… I see them all the time: https://containertech.com/container-sales/53ft-high-cube-sto...
virtuallynathan··on In 1930 the Indiana Bell building was rotated 90°
It came up on Joe Rogan #1742 last week, probably why it made it here.
virtuallynathan··on Graviton2 and Graviton3
Hard to track for other people’s VMs, but they probably have (or can sample) that data for every AWS-operated service (dynamo, S3, redshift, etc..)
virtuallynathan··on Cache warming at Netflix: Leveraging EBS for moving petabytes of data
No, this isn’t for video data, those tend to just be stored on S3. EVCache is like memcached for small data.
virtuallynathan··on PiHKAL: “Phenethylamines I Have Known and Loved”
http://isomerdesign.com/PiHKAL/ Has a copy of the book, basically.
virtuallynathan··on A concept that took hold in the ’70s haunted everything from seat belts to masks
I would say very few in the medical community would even agree to that
virtuallynathan··on Mandate is hereby stayed pending further action by this court [pdf]
There are plenty of risky activities one can legally partake in… are we just going to let those people die when they are injured?
virtuallynathan··on SpaceX shut down part of Dishy's API
They aren’t all public globally — there seems to be at least one in Austria based on this data, the location of which is presently unknown.
virtuallynathan··on YouTube is banning anti-vaccine activists and blocking all anti-vaccine content
I think its fine for this to occur, and we should expect it, but how long should it take to reverse a bad practice? Is a decade or more acceptable?
virtuallynathan··on YouTube is banning anti-vaccine activists and blocking all anti-vaccine content
Sure, in an ideal world we’d have some kind of review, but what we have now seems largely ineffective.
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