nhaliday + scaling-tech   44

Why is Software Engineering so difficult? - James Miller
basic message: No silver bullet!

most interesting nuggets:
Scale and Complexity
- Windows 7 > 50 million LOC
Expect a staggering number of bugs.

Bugs?
- Well-written C and C++ code contains some 5 to 10 errors per 100 LOC after a clean compile, but before inspection and testing.
- At a 5% rate any 50 MLOC program will start off with some 2.5 million bugs.

Bug removal
- Testing typically exercises only half the code.

Better bug removal?
- There are better ways to do testing that do produce fantastic programs.”
- Are we sure about this fact?
* No, its only an opinion!
* In general Software Engineering has ....
NO FACTS!

So why not do this?
- The costs are unbelievable.
- It’s not unusual for the qualification process to produce a half page of documentation for each line of code.
pdf  slides  engineering  nitty-gritty  programming  best-practices  roots  comparison  cost-benefit  software  systematic-ad-hoc  structure  error  frontier  debugging  checking  formal-methods  context  detail-architecture  intricacy  big-picture  system-design  correctness  scale  scaling-tech  shipping  money  data  stylized-facts  street-fighting  objektbuch  pro-rata  estimate  pessimism  degrees-of-freedom  volo-avolo  no-go  things  thinking  summary  quality  density 
may 2019 by nhaliday
How much would it cost to crawl 1 billion sites using rented AWS servers/bandwidth? - Quora
The best way IMHO to do such a crawl would be to recruit a group of say 100-1000 of your friends, and their friends, and write a simple distributed app running in background on their machines, when they sit idle or are lightly used. This way you will be amortizing their monthly broadband bills, with their monthly quotas (e.g. Comcast 250GB) largely unused anyway. I would think that you can get dozens of Mbps of cross bandwidth in such a network, which could do the job in a matter of months.

BTW, if you really meant 1 billion sites, as opposed to pages, multiply the above bills by 100x (average number of pages per site).

--

There is no need for you to crawl. Someone has already done the job for you. Common Crawl https://commoncrawl.org/ is a periodic crawl of the internet, and the results are stored in Amazon S3. You can directly use the results without any charge for any kink of analysis you want to do.
q-n-a  qra  quixotic  programming  engineering  search  minimum-viable  internet  web  huge-data-the-biggest  howto  init  advice  money  cost-benefit  strategy  scaling-tech  system-design 
may 2019 by nhaliday
Edge.org: 2017 : WHAT SCIENTIFIC TERM OR CONCEPT OUGHT TO BE MORE WIDELY KNOWN?
highlights:
- the genetic book of the dead [Dawkins]
- complementarity [Frank Wilczek]
- relative information
- effective theory [Lisa Randall]
- affordances [Dennett]
- spontaneous symmetry breaking
- relatedly, equipoise [Nicholas Christakis]
- case-based reasoning
- population reasoning (eg, common law)
- criticality [Cesar Hidalgo]
- Haldan's law of the right size (!SCALE!)
- polygenic scores
- non-ergodic
- ansatz
- state [Aaronson]: http://www.scottaaronson.com/blog/?p=3075
- transfer learning
- effect size
- satisficing
- scaling
- the breeder's equation [Greg Cochran]
- impedance matching

soft:
- reciprocal altruism
- life history [Plomin]
- intellectual honesty [Sam Harris]
- coalitional instinct (interesting claim: building coalitions around "rationality" actually makes it more difficult to update on new evidence as it makes you look like a bad person, eg, the Cathedral)
basically same: https://twitter.com/ortoiseortoise/status/903682354367143936

more: https://www.edge.org/conversation/john_tooby-coalitional-instincts

interesting timing. how woke is this dude?
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may 2017 by nhaliday

bundles : engframetechie

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