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GPU Supercomputing

Based on your speedups, I'm going to guess you're doing explicit time-stepping and that you're using elements with linear geometry & linear solutions. So your updates are equivalent to sparse matrix-vector multiplies in the heat transfer case. That's pretty much the best case for GPUs...
- eLiu
- Post #11
- Oct 16, 2013
- Forum: Programming
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Chess

I'd be happy to play. I used to play a lot of correspondence-style games on redhotpawn, but school got in the way. Now I need to shape up again b/c there's one guy at my new work who freaking rapes me. But it'll have to be on something that's not a mobile app since I don't have a smartphone...
- eLiu
- Post #21
- Dec 30, 2012
- Forum: OT Discussion Club
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De Facto standard unit testing framework for C/C++?

I've been trying to make this decision as well. Having not tried either, it looks like boost.test and googletest are the best options available right now (best in my opinion, measured by feature set & likelihood of continued future support/development). I'm leaning toward googletest but if...
- eLiu
- Post #4
- Dec 30, 2012
- Forum: Programming
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Backdoor Roths: "abuse" risks? + conversion limits?

Doh, good call. I totally forgot to check their wiki even after searching their forums! lol fail. Interesting that the bogleheads wiki doesn't even mention the "single step" policy I saw on [normal] wiki.
- eLiu
- Post #5
- Dec 27, 2012
- Forum: OT Discussion Club
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Backdoor Roths: "abuse" risks? + conversion limits?

So if I wanted to build a computer, I should talk to Dell? If I need to change my oil, I should visit a mechanic? If I want to design a workout, I should hire a personal trainer? What's wrong w/wanting to understand this stuff for myself and/or do it myself? I know there are several tax...
- eLiu
- Post #3
- Dec 26, 2012
- Forum: OT Discussion Club
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Backdoor Roths: "abuse" risks? + conversion limits?

So I was doing some reading and learned about the tax 'loophole' that allows anyone to contribute to a Roth, regardless of income. Apparently this trick has been in effect since 2010, when congress eliminated the income limit on roth conversions (used to be that you could only convert if your...
- eLiu
- Thread
- Dec 26, 2012
- Replies: 4
- Forum: OT Discussion Club
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How did you find AnandTech?

Anand went to my high school; I think he had graduated by the time I was a freshman. I saw him pull up in his red ferarri one day (to visit one of the teachers as I later found out). One of my friends recognized him + his car and pointed me to a news article about him and this website.
- eLiu
- Post #76
- Nov 27, 2012
- Forum: OT Discussion Club
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Major change with google adwords results since august for family member

I'll point out a few things about the algorithm selection process works at a high level. I work at another company dealing w/online ads. Question: is your family member a CPC or CPM customer? I cannot claim familiarity w/how adwords works, but I see those as options when I try to make an acct...
- eLiu
- Post #6
- Nov 24, 2012
- Forum: OT Discussion Club
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Zynga founder "near tears" over company

They're also known for treating employees like shit including rampant sexism. It's like a 1st world sweat shop there--go in, get paid well for a few years (as well as any other SF software company), come out hating your life. I was recently searching for jobs in SF: the one piece of advice I...
- eLiu
- Post #64
- Nov 18, 2012
- Forum: OT Discussion Club
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San Fran. proposes ban on public nudity

That'd put an end to the shirtcockers...
- eLiu
- Post #7
- Nov 18, 2012
- Forum: OT Discussion Club
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Are these plastic bins tough enough to ship?

I already own a few of them. Ns1, that is exactly what I'm afraid of. But I guess a couple others are saying it'll work fine if I tape it up like crazy? lol
- eLiu
- Post #7
- Nov 10, 2012
- Forum: OT Discussion Club
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Are these plastic bins tough enough to ship?

http://www.target.com/p/sterilite-20-gal-latch-tote-teal-set-of-6/-/A-14010891#prodSlot=medium_1_8&term=plastic%20bin Can I ship those via UPS or Fedex or whatever? Can I bring them on an airplane (checked)? I boxed my stuff up at the beginning of the summer b/c I was subletting. I never...
- eLiu
- Thread
- Nov 9, 2012
- Replies: 6
- Forum: OT Discussion Club
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2 puzzles for you

At a glance this looks like it works. I'll read/think about it in more detail on my flight tonight. Wow this is really exciting! I'd be super happy to know of a different way to solve this problem.
- eLiu
- Post #88
- Nov 6, 2012
- Forum: Programming
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2 puzzles for you

Sorry for the slow reply... been hackathon-ing at my new job XD Anyway, yes bits being the max has some good intuition behind it:
- eLiu
- Post #86
- Nov 3, 2012
- Forum: Programming
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flying during the storm: chance of cancellation?

Yeah can't say I was really paying attention. Hurricanes in the NE (in city areas anyway) are usually pretty boring--cat 1 or 2, whatever. I mean the work event I need to be in CA for is mainly Thurs/Fri. To avoid the storm I would've had to have left by like Sat or Sun which I guess...
- eLiu
- Post #24
- Oct 29, 2012
- Forum: OT Discussion Club
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flying during the storm: chance of cancellation?

Well American Airlines still has flights out of Logan scheduled for tomorrow. No cancellations yet... is at all possible that this will come through or are they just gonna wait till the last minute?
- eLiu
- Post #22
- Oct 29, 2012
- Forum: OT Discussion Club
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flying during the storm: chance of cancellation?

I just want a refund. I rebooked thru AA b/c they still have flights for Tues. I do not want to rebook. I did get travel insurance though; the prev poster sounds like that will help me out here. edit: and that kind of refund policy is total BS! wtf, fuck airlines
- eLiu
- Post #19
- Oct 29, 2012
- Forum: OT Discussion Club
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flying during the storm: chance of cancellation?

So far American airlines hasn't cancelled yet so I guess I can just pray that pulls through. When flights are cancelled due to weather, do I need to call the airline (and wait 10yrs on hold) to get a refund? Or is it automatic if I don't do anything? I mean, they can't just keep my money can...
- eLiu
- Post #16
- Oct 29, 2012
- Forum: OT Discussion Club
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flying during the storm: chance of cancellation?

Yeah I'm not going TO boston, I'm trying to get OUT OF boston. US Airways is still listing a bunch of flights leaving BOS on Tuesday (mostly connecting in PHL). Almost all of them are now sold out. Does US Airways wait till the very last second to cancel? Or do I have a chance of not...
- eLiu
- Post #13
- Oct 29, 2012
- Forum: OT Discussion Club
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2 puzzles for you

Sure, why not. First, some intuition about XOR for those who don't know it well: And now the SOLUTION TO PROBLEM 2:
- eLiu
- Post #84
- Oct 29, 2012
- Forum: Programming
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flying during the storm: chance of cancellation?

Hi all, I was originally booked to fly to SF from Boston on Virgin America this Tuesday... so right in the middle of hurricane Sandy. I didn't think this would be that big of a deal BUT that flight was just cancelled, fuck! I really need to be there by Wednesday evening although it would be...
- eLiu
- Thread
- Oct 29, 2012
- Replies: 24
- Forum: OT Discussion Club
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2 puzzles for you

Yeah and that would've been fine. Unless the problem is very easy (and more meant to see how you code), it's totally ok to have to ask some questions, get help, and otherwise back & forth w/the interviewer. For this problem, it's also probably ok to not know how to analyze the result. You...
- eLiu
- Post #82
- Oct 28, 2012
- Forum: Programming
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2 puzzles for you

Should I just post the solution to the 2nd problem? Is anyone even still paying attention? lol At the risk of sounding like a dick, I'm going to respond to this: So you have no idea how to solve the problem, but you're willing to claim that: 1) All software dev jobs are the same (you haven't...
- eLiu
- Post #78
- Oct 28, 2012
- Forum: Programming
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Virgin America seat selection

Ok, thanks guys! Yeah there's no way I'm paying an extra $500... that's more than double the cost of the ticket!
- eLiu
- Post #5
- Oct 25, 2012
- Forum: OT Discussion Club
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Virgin America seat selection

Hey guys, I'm trying to book a flight on Virgin America. They're letting me select a regular 'coach' fare but then the only seats available are main cabin select. If I choose one of those, they want to bill me an extra $500. It also leaves me the option of moving forward without selecting...
- eLiu
- Thread
- Oct 24, 2012
- Replies: 4
- Forum: OT Discussion Club
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2 puzzles for you

They cannot use time as a factor. Your linked list idea is very promising; I'm impressed you got to that point so quickly. But I don't know how you could arrange so that each successful selection improves the odds of future inmates. Remember, there can be no information transferred between...
- eLiu
- Post #67
- Oct 24, 2012
- Forum: Programming
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tax question

Eh... I fully intend to write down 30 allowances. Sorry, overpaying my tax liability by a factor of 2 is not acceptable, ever. But thanks for the clarification on bonuses. I had assumed that if something is taxed as regular income at the end of the year, it would be consistently treated as...
- eLiu
- Post #9
- Oct 23, 2012
- Forum: OT Discussion Club
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tax question

I will ask HR what the tax status of the bonus is. My friend swears it was regular income for him but HR will know for sure. And yeah, I know asking for > 9 allowances requires some kind of extra interaction with the IRS. I'm asking HR what the deal there is. I don't want to get the $$...
- eLiu
- Post #7
- Oct 23, 2012
- Forum: OT Discussion Club
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2 puzzles for you

Minor:
- eLiu
- Post #63
- Oct 23, 2012
- Forum: Programming
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tax question

The bonus is considered income (this has been verified w/several parties b/c I thought it was weird too). It is earned over the course of the first year insofar as if I quit before the first year is up, I have to pay it back (pro-rated). So the 25% won't apply. (This was a motivating factor...
- eLiu
- Post #5
- Oct 22, 2012
- Forum: OT Discussion Club
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tax question

Do you know where the precise language is? The stuff I'm seeing online talks about if you were/will be refunded all taxes *withheld* this year & last year. I had 0 taxes withheld last year and I'd like to have 0 taxes withheld this year. So technically I will be refunded everything that was...
- eLiu
- Post #4
- Oct 22, 2012
- Forum: OT Discussion Club
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tax question

Hi all, From 1 Jan to 31 Aug of this year, I was paid by a fellowship program; it expired at the end of August. They did not do withholding, so I have been using form 1040-ES to pay estimated taxes each year (so for all of last year & 3/4 of this year, I have had $0 withheld and have paid...
- eLiu
- Thread
- Oct 22, 2012
- Replies: 8
- Forum: OT Discussion Club
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2 puzzles for you

Answer to the last question...
- eLiu
- Post #59
- Oct 21, 2012
- Forum: Programming
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2 puzzles for you

Eliminating lockers in the manner you suggest would be akin to transferring information between inmates. But interestingly, even with this little bit of information transfer, the performance is still way worse than the optimal strategy. Additionally, the problem requires that each inmate...
- eLiu
- Post #54
- Oct 20, 2012
- Forum: Programming
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2 puzzles for you

Damnit, I knew I was missing an obvious technique (i wanted to disallow all the strategies except the one that uses cycles) but for the life of me I couldn't remember what, haha. It does seem silly to post the XOR strategy but miss the summation! >< But here's a hint for using something...
- eLiu
- Post #53
- Oct 20, 2012
- Forum: Programming
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2 puzzles for you

Nope. You can find a strategy where they succeed with a double digit percentage of success. For any problem size even (as long as it's N prisoners opening N/2 lockers, N even.) 0.5^100 is the naive solution for this problem and you can do way better. Yes, the prisoners cannot communicate...
- eLiu
- Post #50
- Oct 20, 2012
- Forum: Programming
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B-Wing or R2-D2?

omg. That is freaking amazing. Where were these when I was a kid?!?!?! Star Wars would've beaten the shit out of the "Space Police" (Lego Space-themed toys in the early 90s) any day! I'm SO tempted to buy all the starfighters. $60 for an X-wing? SOLD!
- eLiu
- Post #10
- Oct 20, 2012
- Forum: OT Discussion Club
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2 puzzles for you

Ok, now to address your question. This is actually a pretty subtle point and I didn't even realize how subtle it is until I started trying to explain it. Actually, Cerb's concern is different from yours. And finally, to anyone questioning WHY each locker is a member of exactly 1 cycle...
- eLiu
- Post #38
- Oct 20, 2012
- Forum: Programming
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2 puzzles for you

Pertaining to the value of puzzle 1 as an interview problem... Yes, most tech interview questions assume you have a certain level of background. I mean I was asked things like "determine if a binary tree is a BST" or "give a dynamic data structure that can return the median in O(1) time" or...
- eLiu
- Post #33
- Oct 19, 2012
- Forum: Programming
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2 puzzles for you

Not 100% sure what "That" refers to in the first sentence. If you mean prisoners being able to pre-arrange a fixed strategy, then yes, depending on your solution, that information can be useful. I guess that wasn't noted clearly in the OP? I updated it so that it's hopefully more clear...
- eLiu
- Post #22
- Oct 19, 2012
- Forum: Programming

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