BC INTERNET
Saved by @Alex1Powell

Hooray, my IPv6 parser is mostly working, and only missing the final cursed case.

 It's done. By god, it's done.

I mean, parseIPv6 is also awful and embarassing and much worse than the stdlib implementation right now. But is it at least faster than the stdlib?
Ope never mind, other tests are failing still. Bah.
lol, fuck. Not only is it 50% slower than the stdlib's parser, it's also not alloc-free.
oh, it's because it's benchmarking parsing a zone, and we have to intern the zone... I think.
Yess. For IPs without a zone, my parser is faster and alloc-free. Not hugely faster mind you.
I guess if you squint, it's about as good as the IPv4 parser. It has to touch 4x more bytes, so just under 4x slower isn't that bad.
That said, I'm pretty sure my code is a branch predictor's nightmare right now, not to mention it's entirely unreadable even by my low standards. Needs another round of improving, now that it passes tests.
I think it's time to checkpoint and play Elite Dangerous tonight, but the plan for tomorrow is to see if I can't turn this into a more explicit state machine, so that the code is considering fewer possibilities at any one time.
In general, I think all IPv6s parse in 4 stages:
- Hex before ellipsis
- Hex after ellipsis
- Embedded IPv4
- Zone suffix

All but the first are optional, and the conditionals to decide which new state to transition to is a bit ugly...
... But I think within each state the "happy loop" condition is simple and should keep the CPU and branch predictors pretty happy.
Current WIP, as I pack in for tonight to go play Elite: https://t.co/acwEFavxQi

WARNING: side-effects may include eye bleeding and stomach ulcers.
It also still has a bunch of debugging code in it, the comments may not match the code any more, and I haven't yet iterated on the benchmarks and SSA to see what hand-inlining was actually productive vs. harmful. So it's all hand-inlined, in the worst possible way.
The code's definitely not getting submitted like this, but that's my hacking process I guess :)

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Dave Anderson
Dave Anderson
@dave_universetf
In my quest to write a fast IPv4+6 parser, I have written a slow-but-I-think-correct parser, to use as a base of comparison.

In doing so, I have discovered more cursed IP address representations that I was previously unaware of.

A thread!

We start out simple, with IPv4 and IPv6 in what I'll call their "canonical form":

192.168.0.1
1:2:3:4:5:6:7:8

Various specs call these "dotted quad", dot-separated fields each representing 1 byte; and "colon-hex", colon-separated fields each representing 2 bytes.

The first bits of complexity come from IPv6. In canonical form, common addresses would end up with long runs of zeros in the middle. So, "::" allows you to elide 1 or more 16-bit blocks of zeros:

1:2::3:4 means 1:2:0:0:0:0:3:4

Next up, for cursed historical reasons, IPv6 permits you to write the final 32 bits of the address in dotted quad form. Effectively, you can splat an IPv4 address onto the end of IPv6 addresses!

1:2:3:4:5:6:77.77.88.88 means 1:2:3:4:5:6:7777:8888

And of course, you can combine the two!

fe80::1.2.3.4 means fe80:0:0:0:0:0:102:304
INTERNET
Pasquale "Pat" Scopelliti
Pasquale "Pat" Scopell...
@ThyConsigliori
29 December 2020 #MAGAanalysis #Overturn

Comments On @OptimisticCon Article:

The key supporting effort appears to be underway on Trump’s operational timeline

As we emphasized yesterday, J.E. Dyer commands us: "But do hold the line."
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Nat Cohen
Nat Cohen
@domainarts
I sympathize with mid-size companies seeking to acquire a premium domain name. Even if they stretch to make the maximum possible offer, it often still can't compete with what a larger company can offer. Their desired domain name remains always out of reach. /1


From the broker:

"The prospective buyer responded and explained that their absolute maximum amount they can spend is $100,000 USD. They are accountants and explained this is an extraordinary amount of money for them." /2

The distribution of how much a domain name is worth to a particular company may look approximately like the right half of a bell curve, with values increasing along the X-axis and the # of companies for which the domain name has that value on the y-axis. /3


Since each domain name is unique, a domain owner wishing to maximize the value of that asset will often wait for an offer in the (light green) rightmost tail of the distribution, from that small percentage of companies for whom the domain name will deliver the most value and /4

as a result can justify making the highest value offers for the domain name. But that means that the domain name will remain out of reach for the vast majority of companies that would benefit from owning the domain name. For even a company at the 80th percentile, in the /5
INTERNET
Sir Aaron
Sir Aaron
@SirAaron_
I’m going to riff on this for a bit about how this works in the real world.

—-Every Deleted Parler Post, Many With Users' Location Data, Has Been Archived

Law enforcement generally doesn’t use work by hackers i their investigations because 𝒉𝒂𝒄𝒌𝒊𝒏𝒈 𝒊𝒔 𝒊𝒍𝒍𝒆𝒈𝒂𝒍. And while it’s permissible for law enforcement to use evidence that was illegally obtained by a private citizen, the government doesn’t like to do it.

The first reason for this is because the government doesn’t want to be perceived as encouraging illegal activity. In fact, if the government goes over the line the court might and has in many cases said the private party was acting on behalf of the government.

If the evidence is thrown out then you risk losing the evidence and everything you leaned from that evidence.

The second reason is that LE doesn’t need somebody else to archive the data during an active investigation. Law enforcement does this all day everyday with the company

It’s called a preservation letter and it requires the company to keep all data it has at that moment for the length of time stated in the letter (usually 90 days).
INTERNET
Andy Pavlo
Andy Pavlo
@andy_pavlo
If you're interested in DB internals, stop what you're doing and watch @CMUDB Quarantine Talk from Nico+Cesar about @SQLServer's Cascades query optimizer: https://t.co/FCdsbHHEaD

Many talks this semester were good. This one is the best. My thread provides key takeaways

[6:50] Microsoft hired Goetz Graffe in the 1990s to help them rewrite original Sybase optimizer into Cascades. This framework is now used across all MSFT DB products (@SQLServer, @cosmosdb, @Azure_Synapse).

[14:43] The optimizer checks whether it has stats it will need before cost-based search. If not, it blocks planning until the DBMS generates them. This is different than other approaches we saw this semester where DBMS says "we'll do it live!" with whatever stats are available.

[21:05] Their Cascades' search starts small/simple and then they make decision on the fly whether to expand search based on the expected query runtime and performance benefit from more search.

[26:33] They explicitly have a property for Halloween Problem. Operators specify whether they protect from it and then optimizer ensures property is satisfied. This is mindblowing. I have never thought about using the optimizer for this but it makes sense.
INTERNET

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Rani Jindan Kaur, wife of Maharaja Ranjit Singh had illegitimate relations with Lal Singh (PM of Ranjit Singh). Along with Lal Singh, she attacked Jammu, burnt - https://t.co/EfjAq59AyI


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https://t.co/yOGZ0pLfHG 5/
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Antonio Garc\xeda Mart\xednez
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I've been a @23andMe customer for a while, and have followed their ancestry updates closely.

All is more or less as expected....except for this bit about Native American.


The family is almost completely composed of Spanish peasants (from various regions) who emigrated, along with a massive wave in the late 19th-cent./early 20th-cent., to Cuba back when it was a booming economy (richer than Spain's) and worth emigrating to (Communism killed that).

Also, the native population of Cuba was annihilated early on---was the first place the Spanish colonized after all. Having a native background in Cuba would be like having the same in, say, Massachusetts, particularly if you're (say) mostly Irish. Just really, really unlikely.

(Note: the North African/Arab background is less mysterious. The Iberian peninsula was part of the Muslim world for centuries. It would be odd *not* to have some Arab/Middle Eastern background coming from Spain. Given the family is mostly from Northern Spain, it's small though.)

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Did you know?
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