pmjordan

37 ms·

421.
by pmjordan 15y ago
Here's the disassembly for objc_msgSend on ARMv6, iOS4.2.1 (sorry no ARMv7 devices on my desk at the moment). I'll try to annotate it: 0x32d98f0c <objc_msgSend+0>: teq r0, #0 ; 0x0 0x32d98f10 <objc_msgSend+4>: moveq r1
422.
by pmjordan 15y ago
Only in the same way that nobody can explain gravity. However there exists a widely accepted model which accurately describes the phenomenon.
423.
by pmjordan 15y ago
Velocity is part of the wave function, but varying it shouldn't affect the qualitative result of the experiment. It will change the specific intensity pattern on the detector side.
424.
by pmjordan 15y ago
As soon as you know where the particle is, you're collapsing the wavefunction (the photons are interacting with the particle), so that won't work.
425.
by pmjordan 15y ago
Slightly more info (and fewer distasteful ads) here: http://www.livescience.com/19268-quantum-double-slit-experim...
426.
Largest Molecules Yet Behave Like Waves in Quantum Double-Slit Experiment(livescience.com)
1 points by pmjordan 15y ago|0 comments
427.
by pmjordan 15y ago
You must be extremely good at predicting any challenges in your designs. I'll sketch out my data structures in advance, but implementing the algorithms for processing them is rarely as straightforward as anticipated. Sketching it out helps
428.
by pmjordan 15y ago
Even where the GPL is fine, LZO consists of some pretty scary code. Though at this point, I think probably enough people smarter than me have understood it and deemed it safe (it's part of the Linux kernel). Snappy is fine as long as you ca
429.
by pmjordan 15y ago
That kind of metaprogramming is just a manual substitute for deep constant propagation. Your optimiser needs to work across functions and compilations, however. It's also tricky for the optimiser to decide how deep to pursue this propagatio
430.
by pmjordan 15y ago
Not at the clock speeds that nvidia chips run at.
431.
by pmjordan 15y ago
I wonder if we'll see chip vendors going out of their way to improve performance and invalidation when using atomic ops. They already put a lot of effort into making this stuff as efficient as possible - the fact that Intel is going in th
432.
by pmjordan 15y ago
Reference counting is nothing new. Visual Basic used it before the transition to .NET. Python uses it, if I remember correctly (with occasional GC to avoid leaks due to cycles). There are probably countless other examples. Reference countin
433.
by pmjordan 15y ago
Pardon my ignorance, but being in Europe means I've never used a 2G CDMA network - the iPhone4S supposedly works for both GSM and CDMA; if you don't get a SIM, does the CDMA module only work if you bought the phone from a CDMA network opera
434.
by pmjordan 15y ago
I don't think the quality of their writing is the problem. Their "apology" comes across as the same kind of apology a child gives when their parent forces them to apologise for something, but they don't really think what they did was wrong.
435.
by pmjordan 15y ago
I suspect that by "I run the proprietary ATI drivers on my laptop" , franciscoapinto does indeed mean he's running catalyst/fglrx.
436.
by pmjordan 15y ago
Samsung and WD are selling 9mm (standard height) 1TB drives, and have done so for almost a year. I think Toshiba or Hitachi recently released a 7mm (extra slim) 750GB drive. Seagate has been selling extra thick (15mm) 1.5TB drives, but only
437.
by pmjordan 15y ago
Do you think the subject matter of the question is off-limits, or do you object to the way it's being asked?
438.
by pmjordan 15y ago
I think the effectiveness of lectures might depend on the student as much as the lecturer. I can remember some lectures (6-10 years ago) and their content quite vividly, even if they were fairly unidirectional and to large audiences. I find
439.
by pmjordan 15y ago
So have they basically disabled the intel GPU then?
440.
by pmjordan 15y ago
"Ultrabook" currently specifically refers to a system with a Sandy Bridge or Ivy Bridge based ULV CPU, all of which have integrated on-die GPUs. Re the announced system: interesting - does Optimus work on Linux these days then? Last time I
441.
by pmjordan 15y ago
Nit-pick: the "Ultrabook" brand specifically means an Intel CPU with built-in GPU. Even outside the brand, there aren't many laptops with that form factor with a non-Intel GPU these days. Having said that, for window compositing the open-so
442.
by pmjordan 15y ago
Similar problem in Vienna/Austria. They actually used to make their data available upon request, which meant proper Google Maps integration, etc. Via some backroom deal, the data is now only available to one company which has done a terribl
443.
by pmjordan 15y ago
You're right, I'm able to make out the effect on my desktop screen when dragging windows from side to side. I guess we only scroll vertically most of the time, not horizontally, so it doesn't come up. That suddenly is no longer true when yo
444.
by pmjordan 15y ago
I find it fascinating that the human eye can pick up on that kind of effect, considering the screen is driven at 60Hz (16.7ms). I haven't noticed it on the first-gen iPad [1], but it suddenly becomes apparent when turning some desktop scree
445.
by pmjordan 15y ago
Tangent: If the 'reply' link below a comment is missing, please click the 'link' permalink to reply (you may need to wait a minute and reload it for the input box to appear). Please don't post replies as sibling comments as they won't nec
446.
by pmjordan 15y ago
Each subpixel needs a transistor (hence TFT - thin film transistor) to drive it, along with the addressing conductors to drive it. I suspect the transistors have to have a certain minimum size to be reliable enough, so their relative size t
447.
by pmjordan 15y ago
I don't think the Core Graphics vector stuff is in any way GPU accelerated, so the Infinity Blade comparison isn't appropriate. The SoCs in iOS devices are shared-memory systems, so system memory is GPU memory.[1] But you're right, the en
448.
by pmjordan 15y ago
Unless you used the raw Objective-C runtime API, which is pure C, to call into the Cocoa Touch libraries. But that would be insane .
449.
by pmjordan 15y ago
You seem to either be defining "culture" very narrowly in terms of work ethic, or you haven't spent any significant amount of time in the countries mentioned. Or maybe both. Even with the narrow definition of culture, I can't say I agree. A
450.
by pmjordan 15y ago
Putting the info about your startup experience from the above comment on your part of the 'people' page would help. The reason people trusted YC early on was because everyone knew pg, rtm and tlb did Viaweb together, so they'd been through

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