20bits - Latest Comments

Re: 10 Tips for Optimizing MySQL Queries (That don’t suck)

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Re: Data Management, Facebook-style

Clark Adams — Wed, 13 Jul 2011 11:23:59 -0000

Working for Facebook must have earned him quite a good amount of experience, dealing with so many data streams and all. I'd love to see future data management systems implement techniques from Jeff's work on FB.

Clark Adams

Re: Data Management, Facebook-style

Apu Nahasapeemapetilon — Wed, 13 Jul 2011 11:04:49 -0000

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Re: Graph Theory: Part III (Facebook)

Dharmalingam Ganesan — Sat, 09 Jul 2011 14:30:42 -0000

This is a lot of fun. One suggestion: Think the article did not explain what is the meaning of "small" and "large" here: If λ is small then the CEO has a lot of influence, if it is large then he has little.
Also, after computing the principal eigenvector, how to interpret it in terms of influence is not elaborated yet.

Re: Graph Theory: Part III (Facebook)

Dharmalingam Ganesan — Sat, 09 Jul 2011 13:42:43 -0000

Geometric interpretation of Eigenvalues: When we multiple a matrix with a vector (i.e., A.v), we are transforming the vector v into a new position. If the transformation preserves the original direction of v, then the vector v is an eigenvector. It is possible that the transformation could have scaled the vector v (either extends or squeezes the size of v). The eigenvalue just denotes the scale (lambda).

Re: Graph Theory: Part I (Introduction)

Dharmalingam Ganesan — Sat, 09 Jul 2011 13:26:31 -0000

Hi, This is a good read. Think there is a typo here: "deg+(v) = deg-(v)" should be "deg+(v) + deg-(v)" to get the degree of a undirected graph. That is, the degree of a node is the sum of out and in degrees.

Re: The Best Facebook Ad Network

John Wallis — Thu, 07 Jul 2011 17:08:31 -0000

Where does one get a list of all the networks?

Re: The Best Facebook Ad Network

Brandon Leibowitz — Fri, 01 Jul 2011 01:18:18 -0000

This is an excellent break down of the top advertising space for Facebook advertisers.

Re: Interview Questions: Loops in Linked Lists

Vidar Hokstad — Mon, 20 Jun 2011 10:44:13 -0000

Just checked my Disqus profile and found this old reply...

Reasoning out the "Tortoise and hare" solution is not that uncommon - I've not had people do it in an interview myself, but I've talked to enough people who have found the solution independently to not think that the solution requires any particularly outstanding intelligence to come up with. I did in fact have no idea that Bob Floyd invented this algorithm until just now. Once I figured it out I didn't think any more about it because of the simplicity of it; I'm used to "inventing" algorithms that turn out to have been invented a long time ago and reinvented by every CS or maths student, graduate or self taught programmers ever since. Most people who study technical subjects or work with them end up doing this sooner or later.The solution flows fairly logically from a few simple observations, and the hard part is making the first few of those observations - pure chance alone would make a reasonable number of people figure out enough of the starting points to be able to figure out that solution.(and this is a major reason why expecting the *answer* to these types of questions, regardless how hard or easy the problem is is the wrong approach to using them in interviews)Generally, for the people I've talked to who has figured out this solution, the process is generally to try to figure out what makes a cycle different, and then try realize that if you can first make sure that the node you're on is inside the cycle if there is one, then the problem is trivial. Then all that is left is to figure out how to move to a node inside the cycle without getting stuck in a loop while trying to check the node you're moving across. Finally, you need to realize that it's not a disaster if you traverse a node more than once without figuring out if there's a loop the first time around - once you do that, it all just snaps into place. Give enough people this question, and someone will eventually muddle through it without any great insight or intelligence at all, just by stumbling onto these few realizations.Your appeal to authority and assumptions of how much time they must have spent solving a problem with no justification for why they would be particularly good at solving this type of problem, nor for why you think he must have spent so much time on it speaks volumes.(oh, and it's quite distasteful to accuse someone of lying while hiding behind anonymity, and also to jump to conclusions about how I supposedly "make job candidates suffer" for it. Particularly since in this case I've never excluded any candidates for failing to solve this problem, but I have *hired* candidates in several instances where a significant part of what convinced me was the way they've answered this question despite not solving it)

Re: 10 Tips for Optimizing MySQL Queries (That don’t suck)

Shashidhar Yarabati — Wed, 15 Jun 2011 08:32:24 -0000

Thank you very much for the good post!!
I am trying to use mtop for profiling my mysql server. I am bit configused here,
1. Is mytop & mtop, both are same?
2. If yes, Can I install mtop on windows servers?
3. I have been roaming over the net to locate the installers/docs for windows. Pls any one help me here to get this
4. last but not least, I am using MySQL 5.x version, in MyTop official site (http://jeremy.zawodny.com/m... they said it will support upto MySQL 4.x versions and in mTop official site (http://mtop.sourceforge.net/) they didnt' say any thing about Mysql versions.

Please suggest me, I want to tune my MySQL server on windows machine. Which tool should I use?

Thanks,
Shashi

Re: Facebook Users Just Want Entertainment

Praxis 2, Praxis 2 test scores — Sat, 11 Jun 2011 17:35:40 -0000

Title: 20bits by Jesse Farmer. Description: 20bits is the website of Jesse Farmer, a computer programmer and entrepreneur living in the San Francisco Bay Area.

Re: Facebook Users Just Want Entertainment

under counter fridge — Sat, 11 Jun 2011 11:07:38 -0000

Wouldn't you want to work out your issues in private?
Or do you just crave the attention? Announcing it to the world:
Facebook users cans now click on new relationship options to make their
status official. Noticing the growing importance relationship ...

Re: Introduction to Dynamic Programming

Jeremy Wilson — Wed, 08 Jun 2011 12:58:05 -0000

> What if all the numbers in the array are negative?

Then the "largest subarray with the maximum sum" will be an array containing just the single "largest" number (i.e. closest to zero). e.g. in the array [-5,-6,-2,-3] the result would be [-2], because it is the largest, and adding anything more to it would make it smaller (more negative). I think his python code works correctly for this case.

Re: Erlang: A Generalized TCP Server

Rolf Dergham — Wed, 01 Jun 2011 06:39:24 -0000

72> echo_server:start().
** exception error: undefined function socket_server:start/3

That's a bad start and I should stick with PHP.

Re: 10 Tips for Optimizing MySQL Queries (That don’t suck)

Nadeem Shafi — Thu, 26 May 2011 06:36:41 -0000

Very good post :)

Re: Graph Theory: Part I (Introduction)

tomspin — Tue, 24 May 2011 13:17:54 -0000

Hi
nice intro. I teach highschool math and want 2 enrich my students in G-theory, notably because of facebok. I like teaching in an "inventive thinking" approach- with some qualitative discussion preceiding any def. and especially theorems. my backgound in graphs is not so brilliant. do you have good problms with hints- 4 example how to analyse mpossibility of bi-coloting 6-gon gull fraph.
thanks
Tom

Re: linked-list

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Re: Obama, McCain, and Data-Driven Campaigning

lutyu319 — Tue, 17 May 2011 21:50:14 -0000

Re: 5 Ways to Improve the Digg App

lutyu319 — Tue, 17 May 2011 21:50:12 -0000

Re: result

lutyu319 — Tue, 17 May 2011 21:50:07 -0000

Re: The State of the Platform: Update

lutyu319 — Tue, 17 May 2011 21:49:53 -0000

Re: Appaholic and Inside Facebook

lutyu319 — Tue, 17 May 2011 21:47:08 -0000

Re: What is a word? An introduction to computational linguistics.

lutyu319 — Tue, 17 May 2011 21:47:00 -0000

Re: Erlang: A Generic Server Tutorial

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Re: Erlang: A Generalized TCP Server

lutyu319 — Tue, 17 May 2011 21:38:50 -0000