Hacker News: deletes

New comment by deletes in "StoreDot’s Bio-Organic Battery Tech Can Charge From Flat to Full in 30 Seconds?"

deletes — Mon, 07 Apr 2014 13:47:41 +0000

It reckons the speedy charging battery technology could be on the market within three years.

According to this chart it really works: https://xkcd.com/678/

New comment by deletes in "Speed memory access by arranging data to take advantage of CPU caching"

deletes — Mon, 07 Apr 2014 07:41:58 +0000

Of course that doesn't apply to games anymore but to high performance computing. Systems for gaming vary too much for that to be of any importance. Maybe if you are doing it for the consoles, but then you have to optimize each individually.

New comment by deletes in "Speed memory access by arranging data to take advantage of CPU caching"

deletes — Mon, 07 Apr 2014 05:48:27 +0000

I was curious about this as I have never done any such testing, so I wrote a simple c program.

The object was a struct with a size of a typical game object( 100B ), then I trashed the memory by doing a lot of malloc/free using the size of the object. The two tests were one with an array of objects( contiguous array ) and the other an array of pointers to objects which were allocated separately. Then I iterated over the object doing some very simple operation( just enough to access it, and identical for each object ) and timed this. And of course I trashed the memory some more for each time.

The time taken ratio is:

array of objects : array of pointers to objects

1 : 1.189

The second test is identical except I made some extra effort to make sure that every object in array of pointers was not adjacent to any previous one in memory:

array of objects : array of pointers to objects

1 : 2.483

The difference got much smaller once the operation on each object became more time consuming.

New comment by deletes in "Why 'gallons per mile' is better than 'miles per gallon'"

deletes — Sun, 06 Apr 2014 07:52:28 +0000

Frames per seconds is better in almost every way. When you use it to watch movies it is better since a normal human understands seconds but not what a frame is. In gaming, frame times usually vary quite a lot, and the average, which is fps, is the important part.

New comment by deletes in "2048 implemented in 487 bytes of C "

deletes — Sat, 05 Apr 2014 08:21:28 +0000

As an obfuscated c example I was expecting portable code. Anyone hoping that as many people as possible try their code should aim for that.

New comment by deletes in "2048 implemented in 487 bytes of C "

deletes — Sat, 05 Apr 2014 06:01:21 +0000

HN got really trigger happy in the last few weeks.

That part of the comment only is partially correct, and not was even the main point of my comment; what I really meant was that it doesn't belong in windows, and the main point was that the code is not portable.

New comment by deletes in "2048 implemented in 487 bytes of C "

deletes — Sat, 05 Apr 2014 05:18:01 +0000

Doesn't run correctly under windows. The code relies on the system call "stty cbreak", which is linux specific.

'stty' is not recognized as an internal or external command, operable program or batch file.

I would love to read comments instead of downvotes. Where am I wrong?

New comment by deletes in "Microsoft Will Soon Bring Back The Start Menu In Windows 8.1"

deletes — Wed, 02 Apr 2014 18:39:42 +0000

right click >> Properties >> Disable metro

I hope there is an obscure setting somewhere that would disable metro completely. As a programmer I see no benefit to it.

New comment by deletes in ""60 Minutes" admits it manipulated the sound in its Tesla segment"

deletes — Tue, 01 Apr 2014 19:43:47 +0000

This is why I don't like April F. Everything has to be rechecked/researched x times. The 60 minutes article is definitely not AF and I doubt my link is also.

New comment by deletes in ""60 Minutes" admits it manipulated the sound in its Tesla segment"

deletes — Tue, 01 Apr 2014 19:25:37 +0000

The strangest outcome of all of this is that Bill O'Reilly's actually made some sense for the first time in history.

http://youtu.be/Pt0ot1LgXZQ?t=1m3s

New comment by deletes in "Google Maps now lets you find and catch wild Pokémon"

deletes — Mon, 31 Mar 2014 18:10:13 +0000

Seriously, what are they waiting for. I'm not a teenager anymore, but If this was a serious app I would totally go catch a few, granted as a joke. And kids would go crazy over this, every single one already has the pokedex( smartphone ), that basically has all required capabilities.

New comment by deletes in "The Cache and Multithreading"

deletes — Sun, 30 Mar 2014 10:29:40 +0000

Comment on the blog that got deleted:

I did a similar test in C and have gotten very similar results. When N is around 4000 the trashing version starts to differ substantially. A 3x difference can already be seen when N is 1000.

This means if your program is running on two threads over different parts of the matrix, every single iteration requires a request to RAM.

I'm skeptical over this part, I have tried to replicate this behavior but was unsuccessful. Even though cores are sharing L3, I doubt that a thread will overwrite the entire cache on every iteration.

New comment by deletes in "Oculus Says They Didn't Expect Such Negative Reactions to Selling to Facebook"

deletes — Sat, 29 Mar 2014 18:00:09 +0000

Note the phrase might as well. The example was a stab at how you can't make such assumptions.

New comment by deletes in "Oculus Says They Didn't Expect Such Negative Reactions to Selling to Facebook"

deletes — Sat, 29 Mar 2014 17:25:53 +0000

You don't know that, they might as well changed their opinion and are now too embarrassed to speak about it.

I think a lot of people were acting with pure emotion. Once the surprise subsides the logical reasoning kicks in and you get the bigger picture.

New comment by deletes in "Tesla Adds Titanium Underbody Shield and Aluminum Deflector Plates to Model S"

deletes — Fri, 28 Mar 2014 19:14:06 +0000

I appreciate the response.

I'm still skeptical about the actual energy usage. If the % more kinetic energy applies equally to battery energy usage.

New comment by deletes in "Tesla Adds Titanium Underbody Shield and Aluminum Deflector Plates to Model S"

deletes — Fri, 28 Mar 2014 15:11:14 +0000

Can we see your calculation and reasoning or did you make the numbers up?

New comment by deletes in "Tesla Adds Titanium Underbody Shield and Aluminum Deflector Plates to Model S"

deletes — Fri, 28 Mar 2014 14:49:16 +0000

Official blog: http://www.teslamotors.com/blog/tesla-adds-titanium-underbod...

New comment by deletes in "MLB.com is using my Google Analytics code"

deletes — Thu, 27 Mar 2014 05:50:23 +0000

This is exactly the reason they responded. By changing the code quietly, they would implicate themselves. An official PR statement like this is obligatory.

What is more probable, that they a lying, or that the random generator generated not a single code that matched, which is very(!) improbable by itself, but two codes that belong to the same account, generated at the same iteration.

New comment by deletes in "MLB.com is using my Google Analytics code"

deletes — Thu, 27 Mar 2014 00:58:43 +0000

Look at the code as the author suggests; you will notice that a part of the code( ~40 lines ) is identical, including the comments.

New comment by deletes in "Facebook’s $2B Oculus deal happened over the last five days"

deletes — Wed, 26 Mar 2014 14:30:19 +0000

I suppose I will get a FB account now, so that may lead to some writing a little longer than tweet length

If only there existed such a thing before facebook, a platform to enable others on the internet to read it,... a blog if you will.

Oh wait...

http://www.altdevblogaday.com/author/john-carmack/

--------

I guess If someone gives you a lot of money you have to talk nice about them.