skysight-inc/HackerNews huggingface dataset:
It was a fat fingered mutual fund who created the flash crash, not HFT's. It was HFT's who prevented it from being a disaster.

http://www.sec.gov/news/studies/2010/marketevents-report.pdf
Looks like MVP to me. But anyway funny concept.
It's an iPad, not android device.
The sense I have coming from the UK is that the US tolerates start up failures far better than we do. If you try in the US and fail, the general vibe seems to be one of, "Ok, it went wrong, brush your self down and try again, and make sure you learned the lessons". In the UK, its more like, "you evil failure, you conned every one and we will bankrupt you and stop you trying again".

So, from a UK POV, the caution this article seems to urge, seems more applicable to the UK than the US.

I highlight this because I believe failure is as useful as success, I think there is possibly more to learn from a failure. I almost feel like a few failures are essential so that lessons can be learned, and stronger new start ups emerge with stronger founders. I believe the US is way better at this than the UK, and possibly Europe.

Or perhaps I have too a rosier view of the US in this respect? Dunno.
I believe multiple exchanges do foster competition and innovation. I believe NASDAQ was one of the first computerized exchanges in an era when human traded in the pits.

Multiple exchanges allow customers to choose from better trading fees, execution times, colocation offering, etc.
Probably made him feel rich.
> It's simple really: any participant who rests an order on the book is adding liquidity. Period.

If a stock is trading at $100.00, and I put a buy order on the book at $0.01, how have I added liquidity?

> This may lead folks to believe that the liquidity is fleeting because they can cancel away before you can execute. However, that simply means they are better and faster than you, not that they are doing anything wrong.

The question is not whether it's right or wrong, but whether it is beneficial. I don't buy that HFT is intrinsically evil, but there seems to be little convincing evidence that it's actually beneficial, either. The system as you've described it basically involves scraping pennies off transactions that would have occurred anyway. That's not intrinsically evil, but it doesn't seem to actually benefit anyone except the HF trader.

> Why, then, don't we simply require them to rest their orders for a longer period of time? Simple: you want tight spreads. As spreads shrink market making becomes less profitable. When market making is less profitable market makers have to be more risk averse to avoid getting adversely selected and losing money. More intelligent models (they become more informed) and less latency (they can leverage that informedness to avoid being selected) is how market makers stay profitable in a market where the average spread is 1 penny.

What's missing here is an explanation of why we should build a system that enables HFT to be profitable. That's not something I care about. If lower profits for HFT means a better market overall, that's fine with me.

Frankly, in markets where the spread is 1 penny, it seems like there's enough liquidity already.
I remember seeing some mention that English has by far more words than most languages.

Saying "Ontology recapitulates phylogeny" in other languages is allegedly hard.
It is interesting that you believe that E(compensation in a start up) > E(compensation running a HFT strategy). The popular media is awash with reports of billions of dollars being made by HFT traders. Are they completely off?

What about HFTs that are running market taking strategies?
What were the latency statistics? How good of time sync were you able to get the EC2 instances?
You Want a Job as a Front-end Engineer?
I don't think he was complaining. I think he asked a really interesting question. What's the benefit of multiple exchanges?

It isn't obvious to me that multiple exchanges are either good or bad. If it is obvious to you, I'd love to hear a technical explanation.
That's exactly the message my summary intended to convey :-)
with a CMS you have barely any writes. Not sure your fear is well grounded in reality :)
I am just curious, contribute where?
Fight the infringement
How Curtis from Fark beat the patent troll
That's lovely and definitely sounds like the most likely explanation.

However, more importantly, would you like some popcorn? We had an accident with a corn silo and an industrial cyclotron, so there's loads to go around. Needs more butter though.
Darpa exploring miniature, atomic sensor systems as alternative to GPS
same for me when i try to login with my RIL account, then after reloading the url it loads. I tried removing one of my saved pages, after confirmation, the page gave a (trapped) error via javascript alert. It looks like it's a bit overloaded..
Transactions that occur in dark pools (over half the liquidity on NYSE listed stocks these days) typically get posted to the exchange after the fact. This used to cause anonymous hedge fund I used to work for all kinds of problems in the leas liquid markets as half the daily volume would suddenly post dive minutes
This explains every Final Fantasy game ever made.
Article does not pass the smell test. College is not where people go to decide if they are mathematically oriented or not. Everything that precedes it does.
Exactly. I got excited about this when I heard about it a few months back because I was in the middle of developing something that uses data from the PDS, but 1) the prize money was tiny compared to the effort and 2) TopCoder claims ownership of all submissions. As I read it, that means you give up all rights to the work. Not acceptable. I emailed some folks at NASA about it, but got no response.
Give the fast rate of growth, I am sure many others predicted this will happen. The only question in my mind is how high they'll reach before funding ends. Lets see if they can hit past $15M.
As long as they don't modify the regex library's source code, that not a GPL violation. GPL violation if they modify gnu's source but didn't share the code freely.
Open Source Enlightenment
It's also subject to poor interpretation:

http://www.dailymotion.com/video/x3gj7y_lost-in-translation_...
This was the transcript of Allison's talk on OSDC.tw last week. A Chinese translation is available here: https://gist.github.com/2400315
Carto CSS rocks my socks
No amount of fancy accounting can ever save someone from the fact that they performed one experiment one time with a treatment group of 6. Extraordinary claims require at least a replicated experiment.
Lets STOP robbing Musicians of their money
Website vulnerabilities fall, but hackers become more skilled
I am looking forward to the next 3 months.
> Sign the damn NDA, it's doing you no harm

It may give you a handicap for several years that limits what jobs you can or can not take. That is harmful.
> Discretization often leads to instability ...

> Of course, all we have are toy models and speculation

These two statements could be construed to be in conflict, especially as I haven't the faintest idea what naive discretizations of stable ODE's is, and Google isn't of much assistance in providing an explanation that I can digest.
HTC Boots CFO Responsible For Beats Audio Strategy
It's number 14 on a search for "Pocket" on the Android market, well off the first page (I see 8 rows on my phone). Not awful (I found what I was looking for, after all), but not great. Note also that they couldn't get pocket.com
Hi @rb2k_, thanks for the feedback.
About the demo link, since we do not have a stable version of the engine yet, we chose to disable our demo platform. But it'll be coming soon !

You're totally right about the installation procedure. Like the other open source projects such as Spree for instance, we miss an executable which will help users to start a new engine with ease. That could be perhaps your first contribution to the project :-)

Finally, concerning your segfault error, if you have time, please open an issue in github (https://github.com/locomotivecms/engine/issues) or on our mailing-list (https://groups.google.com/forum/?fromgroups#!forum/locomotiv...)

thanks again !
Heh, living in LA i can say the cheaper part is talent.

Half the recordings i see in the neighborhood are huge budget series. The other half is a small production where everyone is working for film credit and lousy catering lunch.
Super Recruiter of the Week 3rd April
Thank you, that talk was fascinating - and I don't use that lightly.
---------------------------------

EDIT:

It's inside my edit window and several people have asked for clarification, so I'll try to clarify. If something is unclear, ask, and if it's outside the edit window anymore I will reply.

(1) (footnote from above)
The Zynga case is here:
http://online.wsj.com/article/SB1000142405297020462190457701... (there's a search engine friendly url if ever I saw one)

this is the rare case where you get to zynga size before the "clawback", which is very formal and unusual for that reason...it's not just a couple of heated skype conversations when you're tiny. usually there is no such thing, and the collaboration breaks down around your first few sales or after the product can actually be finished by someone on a small wage. Conveniently, the founders are left holding the "bag".

(2)
Hollywood accounting:
http://en.wikipedia.org/wiki/Hollywood_accounting

e.g.
http://en.wikipedia.org/wiki/Forrest_Gump#Author_controversy

clarification on "search engine friendly URL" - I meant I think the wall street journal should put the title in the URL so that it's matched in pages such as this one, and so Google gives the article more weight!).

(3)
Under marxist theory, anyone who actually owns the means of production (e.g. the web server hosting the content let's say) makes money off of "surprus profit" that workers contribute. If the workers owned the means of production, they would be better off. So, this part of my comment was that it sounds like marxist to talk about ripping off workers, who are voluntarily contributing their labor under capitalist laws. But it only sounds that way -- critics of hollywood accounting do not criticize capitalism, nor that a film distributor can make 500,000,000 worldwide after spending 100,000,000 all told, with the rest being the retained profit. The analogy with marxist discontent is only superfluous, not deep.
XP系统下载
57:43 = ~33% more women get a BS degree than men which is a fairly large gap IMO.

As to the gender gap in the hard sciences 52% of undergraduate Chemistry degrees go to women which arguably makes them under represented, but only relative to their overall dominance. Chemistry is often looked at as a gateway to Medicine so it's arguably a great choice for an undergraduate degree. However, I would argue getting a PHD in Astronomy or Physics is a poor economic choice which is one of the reasons why so few women do so.

PS: Any argument that women can't hack / are unprepared for the hard sciences falls apart based on chemistry numbers.
Ask HN: Which is more important for a startup's location?
A friend and I were discussing the following this morning: if the only determining factor in deciding where to locate a startup were a choice between amenities like a nicer environment and better food/drink choices vs. proximity to home, where there is a large pool of talent having to commute 30-45 min or more, which wins? He thinks that a longer commute is ok if it means better amenities, and I think that this proximity to home is important because the opportunity to commute less can be a significant draw and an untapped market for talent.

What has been your experience?
Show HN: CollabFinder, find developers and designers for your next great project
There's also this for even better performance: https://gist.github.com/2113359

Don't forget to set your envvars!
Counter Terrorism Guidelines Give Authorities Vast Access to Info
Without getting into whether we're paying too much of a premium to the financial industry to make the economy more efficient (for instance, by enabling you to get a 15 year mortgage on a house with 20% down instead of a 5-year mortgage with a balloon payment):

HFT makes a profit off the trading spread. The spread is "friction" in the market. It's the gap between what one person wants to spend and another wants to take in for the same good. Every time you make a trade, you cross the spread and thus pay a fee; you're "buying liquidity".

HFTs compete with everyone else trying to make a profit from the spread. The people being harmed most directly by HFTs are themselves trying to extract a fee from normal market participants. Moreover, by competing very effectively, the HFTs are narrowing the spread. They are effectively bidding the price of liquidity down.

It would make sense to be mad at HFTs if the participants they were replacing were mom's and pop's just trying to make a reasonable living while looking out for the good of the whole market. But that's not who HFTs are displacing. The human traders who profited from spreads in the 1980s were often crooked as a carton full of fish hooks. The markets before automation (and the OTC markets today) are riven with people running strategies to skim money off real buyers and sellers.

The more you know about how the markets work and what the incentives of all the players are, the harder it becomes to feel any outrage about HFT.
The system as you've described it basically involves scraping pennies off transactions that would have occurred anyway.

Could you explain how to "scrape pennies" (as in specific mechanics, your explanation should involve limit orders or whatever), and why this strategy doesn't benefit the speculators the HFT is trading with?
Local storage is a bad fit for caching. You can compose the document from smaller fragments and leverage the browser cache. It’s simple AJAX. That’s what I meant by gradual caching.

I thought a bit about your solution, and I guess it’s doable using existing technology AND leveraging gradual caching without JS.

Browsers would just have to support Xinclude[1].

For example:

> GET /foo

< 200 OK HTTP/1.1
< ETag: 1
<?xml version="1.0"?>
<html xmlns="http://www.w3.org/1999/xhtml
xmlns:xi="http://www.w3.org/2001/XInclude>
<head>...</head>
<body>
...
<p><xi:include href="fragment" parse="text"/></p>
</body>
</html>

Using standard HTTP/1.1 session protocol this would require additionally requesting /foo/fragment, SPDY can just use SS push.

> GET /foo/fragment

< 200 OK HTTP/1.1
< Etag: 1
[…]

Now on refresh conditional GET for /foo hits cache, and conditional GET for /foo/fragment doesn’t. Abracadabra: partial caching.

> GET /foo
> If-None-Match: 1

< 304 Not Modified HTTP/1.1

> GET /foo/fragment
> If-None-Match: 1

< 200 OK HTTP/1.1
< Etag: 2
[…]

While it looks like some new technology, it’s simple really. Browsers already compose pages by fetching scripts, images, embedded objects, iframes. This is not that different.

Moreover, this approach provides backwards compatibility, because if the browser doesn’t resolve XInclude, you can just do that yourself using AJAX.

This solves your problem, but requires changes only on the client side.

[1] https://en.wikipedia.org/wiki/XInclude
Coding Horror: What's Worse Than Crashing?
Meta: This article is just silly. It is a bunch of quotes from discussion forums (this one included) that are in fact comments to a simple blog post (referring to another blog post of roughly equal content). Is this supposed to be professional journalism these days?
http://versioneye.com/ is a community around Software Libraries. They will release a news wall with comments and statuses in the next weeks.
I have to give the faavoriteapp crew a big thumbs up vote. Excellent for those of us who use Twitter to track things & people we want to bookmark for later reference. Great design, use it often.
I actually agree with the OP in general. I have a mistrust of MongoDB overall, and avoid using it in big, data-intensive situations...

BUT, in LocomotiveCMS and a few others, it make brilliant sense. Like you mentioned, it's very lightweight in terms of DB-writes, and allows for a flexibility that when put together the way the the Locomotive team has done makes a CMS a wonderful thing for end users.

So I think you guys are both right in the this case. Choose the right tool for the job and all that... and the Locomotive team definitely chose the right tool.
> What if my hard drive crashes when it loses power? At that point I'm in the same position as when I lose RAM.

Oh sure, except that the probability of losing your hard drive when you lose power is about 1 in a very big number. Whereas, the probability of losing the contents of your RAM when you lose power is 100%.

Now, MySQL (and in fact, most RDBMS outfits) provide tools for fixing corrupt data. But you actually need corrupt data to fix. That's the entire point of a hard drive.

I'm sure VoltDB would be perfect for a chat application or something of that nature. It would be terrible for anything that involved the transfer of $$$ (banking, ecommerce, etc).
VoltDB maintains a total perfect ordering to transactions as well.
CUORE DI FOCACCIA
CollabFinder is a network of geeks like you looking for collaborators. No recruiters. No MBAs.

It's the place to go when you're looking for someone to help you with your next big idea. Browse developers, designers, illustrators and writers by skill, interest, location and how many friends you have in common. Then chat with anyone with one click.

And if you're looking to do a new startup tag yourself with "Y Combinator" or "Summer Camp" or "TechStars" to get pitched by people like you. Want to see Python developers in San Francisco who want to do a Y Combinator company related to education? No problem.

Try it out now at CollabFinder.com and let us know what you think.

Saha, Gil and Simon.
The iPhone is as much a music player as a phone, so every iPhone comes with a special microphone headset with some external controls in the chord. Many iPhone users (myself included) prefer to talk on the phone via this headset. Using the headset you get better sound quality for both parties, can hear with both ears, can move more freely and be more comfortable and can use the phone to take notes or check your calendar or look something up on the internet while you talk. So when you talk on an iPhone, the phone might be in your pocket or in your lap or on the desk in front of you or just about anywhere. This presumption that people who are talking on the phone must be holding the phone by its base against their head is frankly a relic of an earlier time when phones weren't also good music players.

If you're listening to music and receive a call, one squeeze to the headphone chord answers the call, then the music comes back up where it left off when you or the other party hangs up. It's really convenient.

The AT&T network was kind of crappy for a while because they had trouble keeping up with demand. This perception issue only affected people who didn't use headphones and held the phone in a certain way and had unusually poor local signal strength...but even then, it wasn't appreciably worse than the situation those same people would have faced with the prior model, the 3GS.
The article is in the Chronicle of Higher Education.

It's speaking to an audience of Educators at the University level.

Naturally, the context of their solutions will be one in which those Educators operate.
I recall reading in another article, I believe the New Yorker profile of her, that she also begins around 5:30.

The article assumes she is starting work at nine, whereas if she is in fact starting at 5 or 6, she is still working at least ten hour days.
I think you're right, but I guess some people thought your comment didn't add to the discussion.

It did answer the original question. I wouldn't have downvoted it, but I wouldn't have upvoted it either.

That said, I do believe it's not the best suggestion (especially since pud seems engaged and interested in growing the site).
Testing/Debugging can be achieved by running your own mock exchange with historical or generated data.
Also, most exchanges provide a simulated environment where you can do fake trades and make/loose fake money.
I think if you read his comment just a little more carefully you'll see what I was responding to. I don't have a "side" in this particular debate.
I'm honored, you're asking us... ?
I'd like to add an independent voice too. I tried VoltDB out around a year ago. Ran it on 3 servers, with k=1 (all data replicated on 2 nodes). Servers were Dell PowerEdge 860 - only 8GB RAM, and a Q6600 quad-core processor. They cost maybe $500 or so. Even with a low-end buildout, I was able to hit around 110k TPS. This wasn't one of VoltDB's sample apps; it was a small proof-of-concept for a telecom application. They don't seem to be riding the hype train.

As far as open source: I was using the .NET client, and fixed a few issues with it. The folks at VoltDB were really responsive about working with me and accepting my patches. They also took time to explain the inner workings, sorta give me a launching point to investigating the core code. Pretty good experience for a commercial open source project.
I don't think this is going to be a game changer, but it think it will be a success. It competes against the Canon 5D mk III. It will do well because of the RAW which Canon seems to be unable / unwilling to put in anything but the new C500. The main problem is the sensor size. It is not FF35 or even S35. This bucks the current trend. Black Magic is well known for its hardware and bought into software nicely, but this is their first camera.
It seems anti-competitive that exchanges can be private at all

"Anti-competitive" is a false (i.e. nonsensical) concept. I mean, if I am a really good golf player, and I just keep getting more and more competitive, do I suddenly cross a bright red line that makes me "anti-competitive" because I'm just too competitive?

It's just a made-up term used to attack business that lots of people have unknowingly bought into.

If it were to actually mean something, it would mean using the government to grant a monopoly. That's the opposite of any kind of private business where two or more parties are voluntarily agreeing to trade. Like, for example, a private exchange.
While I admire your intentions, I think you should first look at the actual number of transgender people starting companies before drawing a conclusion that they "don't get funded". For all I know (and I don't know the numbers, I'm speculating here) we could use the same argument about Latinos and African Americans (jeez, do I hate those stupid terms).

It'd be interesting if you could backup your intentions with some numbers. I think you'll find the startup community, specially in San Francisco and the Bay Area, is specially open to all cultures and sexual orientations.

In any case, the best of lucks! :)
Tests were run on the same machine, and the database HD was a single 300 GB 7200 RPM drive. Was the drive partitioned such that the

What about running on 24-48 SSDs with two BBWC controllers w/ 128 GB of RAM?

I've never really been impressed by database testing on these small IO constrained workloads. Also what database is it being tested against and is the pKey an int or a UUID?
It is also a good example of cooperation. The Huygens probe was done by the ESA.
Research - Election 2012: Political Candidates in Search and Social | Conductor