| --- Log opened Fri Jun 28 00:00:05 2013 |
| 00:02 | | You're now known as TheWatcher[T-2] |
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| 01:30 | | Derakon[AFK] is now known as Derakon |
| 02:09 | | * Derakon sighs at the Angband forums. |
| 02:10 | <&Derakon> | Guy's trying to compile the game, gets an error in the bit where the game creates a list of valid front-ends based on defined symbols (e.g. if USE_X11 is available then the X11 frontend is available for use). |
| 02:10 | <&Derakon> | None of the USE_* symbols are defined, so the compiler barfs because it refuses to create an empty list. |
| 02:11 | <&Derakon> | So he sticks a number into the list to force it to compile, and then wonders why he gets a segfault. |
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| 02:30 | < [R]> | lol |
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| 05:40 | < AnnoDomini> | http://fatpita.net/?i=12330 |
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| 05:50 | | * Alek eyes |
| 05:50 | <@Alek> | "1 petabyte = 74 terabytes" |
| 05:50 | <@Alek> | wat |
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| 08:08 | | * sshine is looking at how to allocate heap memory for algebraic data structures in reversible machines. |
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| 10:16 | < Vorntastic> | Okay. Frontier simplifier has to work on an iterator-oid, and return a map of the appropriate type. |
| 10:18 | < Vorntastic> | I'll have to invent the iterator-oids in question; they're... uh... |
| 10:20 | < Vorntastic> | Coming out of priority queues of iterators themselves. |
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| 14:39 | | You're now known as TheWatcher[afk] |
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| 16:14 | <@Azash> | 06:50 <@Alek> "1 petabyte = 74 terabytes" < what happened here? |
| 16:15 | <@Azash> | Even if going from peta to tebi, that's still 900 |
| 16:22 | | Derakon[AFK] is now known as Derakon |
| 16:39 | <@Alek> | I know! |
| 16:39 | <@Alek> | that was in response to Anno's link just minutes before |
| 16:39 | <@Alek> | [23:40] <AnnoDomini> http://fatpita.net/?i=12330 |
| 17:44 | <@iospace> | ... you know, i see why you're supposed to put one action per line when writing out instructions |
| 17:45 | <@Alek> | ah? |
| 17:46 | <@iospace> | yes |
| 17:46 | <@iospace> | because it helps reduce confusion over what happens first |
| 17:54 | | ktemkin[afk] is now known as ktemkin[work] |
| 18:41 | | * iospace is starting to get this driver figured out :3 |
| 18:42 | < Syka> | i am parsing smartctl data |
| 18:42 | | * Syka cries |
| 18:43 | <@iospace> | and? |
| 18:43 | <@iospace> | you have no sympathy from me |
| 18:43 | < Syka> | iospace: at least its in a fixed width format |
| 18:43 | < Syka> | theres a bug on the smartmontools tracker for a machine readable format |
| 18:43 | < Syka> | its closed as WONTFIX |
| 18:43 | < Syka> | ;v; |
| 18:45 | <@iospace> | Syka: again, no sympathy |
| 18:46 | | * Syka cries on iospace |
| 18:56 | <&ToxicFrog> | while I have been working on this CL, someone has upgraded one of the libraries I use under me. |
| 18:56 | <&ToxicFrog> | Awesome. |
| 18:57 | < Syka> | is it a good upgrade |
| 18:57 | < Syka> | or a 'oh crap everything is broken' with a side of 'i have never seen so much blood' |
| 18:57 | <@Azash> | Syka: Here's a movie quote |
| 18:57 | <@Azash> | "Never have I seen so many men wasted so badly" |
| 18:58 | < Syka> | what is this referring to |
| 18:58 | <&ToxicFrog> | Syka: it's a good upgrade, but an API-incompatible one |
| 18:58 | <@Azash> | Syka: The WONTFIX |
| 18:59 | < Syka> | heh |
| 19:46 | <@iospace> | annnnnnnnd brain fried for a moment |
| 19:46 | <@iospace> | hey all |
| 19:46 | | * Tamber balances a muffin on iospace. |
| 19:46 | | * iospace hands it back to Tamber, all warm |
| 19:47 | <@Tamber> | mmm, toasty |
| 20:14 | <@iospace> | ok, so i think i have this driver down :D |
| 20:14 | <@iospace> | just need to figure otu a few more things :3 |
| 20:17 | | Shift [NSwebIRC@Nightstar-33c44af7.orl.bc.ca] has joined #code |
| 20:18 | | Kindamoody|out is now known as Kindamoody |
| 20:21 | | Turaiel[Offline] is now known as Turaiel |
| 20:26 | <@froztbyte> | like what mistakes you made to get to that point in life? |
| 20:37 | | You're now known as TheWatcher |
| 20:41 | | * iospace is using a goto in C o: |
| 20:43 | < [R]> | bfd. So does Linus |
| 20:44 | | Shift is now known as monster |
| 20:44 | | monster is now known as monsterenergy |
| 21:09 | | Kindamoody is now known as Kindamoody[zZz] |
| 21:19 | <@iospace> | time to see how bad this thing burns |
| 21:19 | <@iospace> | oh hey, it builds |
| 21:19 | <@iospace> | that's step one :V |
| 21:24 | < monsterenergy> | Does anyone here know if deleting system32 is good or bad? |
| 21:24 | <@froztbyte> | ...wat |
| 21:24 | <@froztbyte> | why would you want to do that? |
| 21:25 | <@Tamber> | Ooh goodie, it's troll time~ |
| 21:26 | < monsterenergy> | What does it do? |
| 21:27 | <@froztbyte> | plenty of things |
| 21:27 | <@froztbyte> | because very little windows software is actually 64 bit |
| 21:27 | <@froztbyte> | good rule of thumb: don't touch it if you don't know what it's for |
| 21:28 | < monsterenergy> | K thanks. |
| 21:28 | < monsterenergy> | Good idea man. |
| 21:28 | <@iospace> | and derp! |
| 21:30 | | monsterenergy [NSwebIRC@Nightstar-33c44af7.orl.bc.ca] has left #code [""] |
| 21:56 | <@Alek> | http://imgur.com/gallery/HvX8z/comment/78310242 |
| 21:57 | <@Alek> | scroll to the bottom |
| 21:58 | | * ErikMesoy understands those. >_> |
| 21:58 | | * froztbyte giggles at a couple of them |
| 22:00 | <@gnolam> | The third one should be why he /likes/ Earl Grey.~ |
| 22:00 | | * iospace giggles |
| 22:12 | | VirusJTG [VirusJTG@Nightstar-09c31e7a.sta.comporium.net] has joined #code |
| 22:14 | <@Alek> | for Vorn, mainly: |
| 22:14 | <@Alek> | http://i.imgur.com/Utrq0su.png |
| 22:17 | < RichyB> | Okay, I have been nerd-sniped. What's the most efficient DEFLATE compression of a stream of zeroes of a given length? |
| 22:18 | < RichyB> | zlib with compression factor 9 seems to give me 87kB for a 30MB string of nulls. |
| 22:18 | <@Tamber> | /dev/nul |
| 22:18 | | * Tamber smack'd. |
| 22:20 | < RichyB> | Yes, good job on the Kolmorogov complexity there, Tamber. I happen to need DEFLATE compatibility though, not any arbitrary Turing machine. |
| 22:21 | <@froztbyte> | haha |
| 22:21 | <@froztbyte> | I have no idea, though |
| 22:21 | <@froztbyte> | right now is the first time I'm running dedicated application servers in a long time |
| 22:33 | <&Derakon> | Run-length encoding should be your best bet for a string of zeros. |
| 22:34 | <&McMartin> | Except, again, that wasn't the question. =P |
| 22:35 | <&Derakon> | I'm doing the standard CS response of "Why are you trying to do that? You should do this other thing instead." |
| 22:36 | <&Derakon> | (Note I don't claim this is a good thing) |
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| 22:36 | <&McMartin> | It's not even that other thing you should do, though; what you should do is stick to a widely used and highly compatible compression format universally, like, oh, zlib |
| 22:36 | <&McMartin> | And then try it out to see how good a compression factor you get. |
| 22:43 | <@Alek> | "0E100000"? |
| 22:43 | <@Alek> | or some such |
| 22:45 | < RichyB> | The problem with cute answers like "dd if=/dev/zero bs=LENGTH count=1" is that I don't have any control over the decompression. |
| 22:45 | < RichyB> | The decompression algorithm has already been specified (by the PNG specification) to be DEFLATE. |
| 22:46 | < RichyB> | All I can do is pick the best-possible compression. |
| 22:55 | | Turaiel is now known as Turaiel[Offline] |
| 23:06 | <&Derakon> | For PNG, aren't there programs that try to find the optimal compression for you? |
| 23:06 | <&Derakon> | Yeah, http://optipng.sourceforge.net/ |
| 23:07 | <~Vornicus> | there's also pngcrush |
| 23:11 | <@gnolam> | And pngout. And others. |
| 23:32 | < RichyB> | For starters, the non-optimal PNG image that I'd have to generate in order to feed it into optipng is 270GB. |
| 23:32 | <@TheWatcher> | ... |
| 23:32 | <@TheWatcher> | what the crap |
| 23:33 | < RichyB> | I'm making a 10-megapixel by 10-megapixel image. |
| 23:33 | <@TheWatcher> | O.o |
| 23:34 | <&McMartin> | And most of it is blank? |
| 23:34 | <&McMartin> | OK, I'm going to side with Derakon now: Are You Sure This Is Actually The Right Problem To Be Solving |
| 23:35 | < RichyB> | Indeed, all but the first byte of each row is nulls. |
| 23:35 | <&McMartin> | And not, say, some kind of HTML page with fixed pixel widths and placements of subimage components. |
| 23:35 | < RichyB> | What makes you think I'm trying to solve a problem? |
| 23:35 | <@TheWatcher> | That's, like, 273TB of data assuming R8G8B8 |
| 23:35 | < RichyB> | This is pure nerd sniping. |
| 23:35 | < RichyB> | TheWatcher: yesss, you get the idea. |
| 23:35 | < RichyB> | I am trying to create a problem. :D |
| 23:36 | <&McMartin> | I suspect that huffman encoding will eventually hit some kind of limit |
| 23:36 | < RichyB> | That would be why I am reading RFC 1951 (the DEFLATE specification) right now. |
| 23:37 | <&McMartin> | But that if you find a workable answer with a smaller image, say, 10 kilopixel by 10 kilopixel, the answer will not change when scaled up by a factor of 10^6. |
| 23:37 | < RichyB> | I'm not trying to solve a problem here, I'm trying to create a problem. |
| 23:37 | <&McMartin> | Is the problem "You there, figure out how to encode this image", or "lol, have a deceptively small image and have it blow out your entire SAN as swap" |
| 23:38 | < RichyB> | It's the latter, obviously. |
| 23:38 | <&McMartin> | This wasn't obvious~ |
| 23:38 | < RichyB> | What else am I going to want with ten squared megapixels? |
| 23:38 | <&McMartin> | In which case, my answer is "do science, not engineering" |
| 23:38 | < RichyB> | Yyyes, which is why I am reading RFC 1951 carefully to try and work out what my best possible compression ratio with one pass of DEFLATE is. |
| 23:39 | <&McMartin> | That's engineering~ |
| 23:39 | <&McMartin> | ISTR the PNG spec has an enumeration of configurations of zlib. |
| 23:44 | < RichyB> | PNG spec says that pixels are stored in a sequence of IDAT blocks. The contents of the IDAT blocks are concatenated and parsed as a zlib stream. |
| 23:45 | < RichyB> | Actually, thank you for making me double-check that because I thought it was a DEFLATE stream. |
| 23:45 | | * RichyB switches from RFC 1951 to RFC 1950. |
| 23:48 | <&McMartin> | The two are IIRC quite similar |
| 23:48 | <&McMartin> | (I'm using zlib to inflate stuff in monocle) |
| 23:49 | < RichyB> | Oh, I wasn't too far off the mark. 1950 (zlib) sets up a byte stream containing a 1951 (DEFLATE) stream. |
| 23:49 | | * McMartin nods |
| 23:49 | <&McMartin> | zlib has its own header stuff independent of DEFLATE though. |
| 23:49 | <&McMartin> | (Which *did* burn me in Monocole; zip files do not have zlib headers) |
| 23:52 | < RichyB> | I'm effectively limited by the mathematics of DEFLATE. |
| 23:53 | <&McMartin> | Isn't DEFLATE a huffman variant? |
| 23:54 | < RichyB> | DEFLATE is lz77 followed by Huffman. |
| 23:55 | < RichyB> | I mean the operations on the data go [bytes -> lz77 -> tokens] then [tokens -> Huffman -> bits] |
| 23:55 | | * McMartin nods |
| 23:55 | <&McMartin> | Are you hoping to be able to get better than machine performance through knowing in advance what the data looks like? |
| 23:56 | < RichyB> | I know for a fact that I'm producing a flat single-colour image. |
| 23:57 | < RichyB> | The PNG image that I'm kicking out looks like: |
| 23:58 | < RichyB> | row 0, filter mode None, 10 million repetitions of the R,G,B triple that encodes British Racing Green. |
| 23:58 | < RichyB> | rows 1,n: filter mode "UP", 10 million repetitions of the three null bytes. |
| --- Log closed Sat Jun 29 00:00:20 2013 |