digitalmars.D.announce - DConf 2013 Day 3 Talk 4: LDC by David Nadlinger
- Andrei Alexandrescu (8/8) Jun 17 2013 You know the drill!
- Alex =?UTF-8?B?UsO4bm5l?= Petersen (16/16) Jun 17 2013 Great talk!
- bearophile (11/13) Jun 17 2013 Slide 14:
- nazriel (7/20) Jun 17 2013 I don't know what PFFT stands for (can't google it either, funny
- Justin Whear (3/31) Jun 17 2013 My guess is Parallel Fast Fourier Transform.
- jerro (5/44) Jun 17 2013 It's Pretty Fast Fourier Transform. The code is at
- Kai Nacke (8/36) Jun 18 2013 As far as I followed the LLVM commit list, the change is that the
- Andrej Mitrovic (4/5) Jun 17 2013 There seems to be some audio glitching every couple of seconds (at the
- Steven Schveighoffer (10/15) Jun 17 2013 I noticed that during the conference. There were several talks where th...
- Walter Bright (2/5) Jun 17 2013 I was saying "flip that!".
- Joseph Rushton Wakeling (2/7) Jun 17 2013 https://www.youtube.com/watch?v=m6jsXQm5IrM#t=106s :-)
- Marco Leise (6/14) Jun 17 2013 Am Mon, 17 Jun 2013 22:03:09 +0200
- David Nadlinger (6/14) Jun 18 2013 Yes, there were, and it was rather irritating for me as well.
- Andrei Alexandrescu (3/11) Jun 17 2013 HD video up: https://archive.org/details/dconf2013-day03-talk04
- Nick Sabalausky (4/19) Jun 17 2013 Torrents/links up:
- Joseph Rushton Wakeling (2/2) Jun 18 2013 ... slightly more serious response: really nice talk, David, and
- Jacob Carlborg (8/15) Jun 19 2013 David mentions in the talks that git submodules make it more complicated...
- Jacob Carlborg (6/13) Jun 19 2013 About the Mac OS X support. Is TLS the only problem on Snow Leopard?
You know the drill! reddit: http://www.reddit.com/r/programming/comments/1gie4b/dconf_2013_ldc_the_llvmbased_d_compiler_by_david/ hackernews: https://news.ycombinator.com/item?id=5892652 facebook: https://www.facebook.com/dlang.org/posts/658638807483137 twitter: https://twitter.com/D_Programming/status/346598441230671873 youtube: http://youtube.com/watch?v=ntdKZWSiJdY Andrei
Jun 17 2013
Great talk! Regarding the ci.lycus.org fleet, credit should definitely go to present in the pie chart) too for providing many of the machines hooked up to the master node. The fleet doesn't do a whole lot of work most of the time, so if you have a project that 1) has a sane build system; 2) you're willing to respond to build failures on; 3) and is 'significant' enough, feel free to email me and I'll see what I can do. (By 'significant' I mean "has enough impact to be useful for a reasonable amount of D programmers". This is of course pretty subjective, but we have to be a bit conservative about how many projects we add so that we don't end up having lots of stalled builds in the queue.)
Jun 17 2013
Andrei Alexandrescu:http://www.reddit.com/r/programming/comments/1gie4b/dconf_2013_ldc_the_llvmbased_d_compiler_by_david/Slide 14: PFFT (SSE) seems slow on LDC2: if you can extract a small test case LLVM devs will appreciate a lot a bug report (they fixed many lacks of optimizations submitted by me). If you have a link to the PFFT code them maybe I can do that myself. Slide 25:Implicit invariants often hard to track downThen maybe it's a good idea to add such invariants to the dmd front-end code, even before its port to D. Bye, bearophile
Jun 17 2013
On Monday, 17 June 2013 at 13:47:20 UTC, bearophile wrote:Andrei Alexandrescu:I don't know what PFFT stands for (can't google it either, funny results shows up) but if it related to vectorization then maybe LDC has been slower because it was built against LLVM 3.3 while LLVM 3.4 brings more vector optimizations. Maybe all what has to be done, is rerunning benchmarks against LDC + LLVM 3.4 ?http://www.reddit.com/r/programming/comments/1gie4b/dconf_2013_ldc_the_llvmbased_d_compiler_by_david/Slide 14: PFFT (SSE) seems slow on LDC2: if you can extract a small test case LLVM devs will appreciate a lot a bug report (they fixed many lacks of optimizations submitted by me). If you have a link to the PFFT code them maybe I can do that myself.Slide 25:Implicit invariants often hard to track downThen maybe it's a good idea to add such invariants to the dmd front-end code, even before its port to D. Bye, bearophile
Jun 17 2013
On Mon, 17 Jun 2013 17:41:22 +0200, nazriel wrote:On Monday, 17 June 2013 at 13:47:20 UTC, bearophile wrote:dconf_2013_ldc_the_llvmbased_d_compiler_by_david/Andrei Alexandrescu:http://www.reddit.com/r/programming/comments/1gie4b/My guess is Parallel Fast Fourier Transform.Slide 14: PFFT (SSE) seems slow on LDC2: if you can extract a small test case LLVM devs will appreciate a lot a bug report (they fixed many lacks of optimizations submitted by me). If you have a link to the PFFT code them maybe I can do that myself.I don't know what PFFT stands for (can't google it either, funny results shows up) but if it related to vectorization then maybe LDC has been slower because it was built against LLVM 3.3 while LLVM 3.4 brings more vector optimizations. Maybe all what has to be done, is rerunning benchmarks against LDC + LLVM 3.4 ?Slide 25:Implicit invariants often hard to track downThen maybe it's a good idea to add such invariants to the dmd front-end code, even before its port to D. Bye, bearophile
Jun 17 2013
On Monday, 17 June 2013 at 15:56:21 UTC, Justin Whear wrote:On Mon, 17 Jun 2013 17:41:22 +0200, nazriel wrote:It's Pretty Fast Fourier Transform. The code is at https://github.com/jerro/pfft/tree/experimental (I linked to the experimental branch because master branch is quite outdated)On Monday, 17 June 2013 at 13:47:20 UTC, bearophile wrote:dconf_2013_ldc_the_llvmbased_d_compiler_by_david/Andrei Alexandrescu:http://www.reddit.com/r/programming/comments/1gie4b/My guess is Parallel Fast Fourier Transform.Slide 14: PFFT (SSE) seems slow on LDC2: if you can extract a small test case LLVM devs will appreciate a lot a bug report (they fixed many lacks of optimizations submitted by me). If you have a link to the PFFT code them maybe I can do that myself.I don't know what PFFT stands for (can't google it either, funny results shows up) but if it related to vectorization then maybe LDC has been slower because it was built against LLVM 3.3 while LLVM 3.4 brings more vector optimizations. Maybe all what has to be done, is rerunning benchmarks against LDC + LLVM 3.4 ?Slide 25:Implicit invariants often hard to track downThen maybe it's a good idea to add such invariants to the dmd front-end code, even before its port to D. Bye, bearophile
Jun 17 2013
On Monday, 17 June 2013 at 15:41:24 UTC, nazriel wrote:On Monday, 17 June 2013 at 13:47:20 UTC, bearophile wrote:As far as I followed the LLVM commit list, the change is that the loop vectorizer is now enabled at -O2 (instead of -O3). I don't know the options David has used but I assume something like "ldmd2 -O -inline -release". "-O" from ldmd2 maps to -O3 and therefore enables the loop vectorizer. Regards KaiAndrei Alexandrescu:I don't know what PFFT stands for (can't google it either, funny results shows up) but if it related to vectorization then maybe LDC has been slower because it was built against LLVM 3.3 while LLVM 3.4 brings more vector optimizations. Maybe all what has to be done, is rerunning benchmarks against LDC + LLVM 3.4 ?http://www.reddit.com/r/programming/comments/1gie4b/dconf_2013_ldc_the_llvmbased_d_compiler_by_david/Slide 14: PFFT (SSE) seems slow on LDC2: if you can extract a small test case LLVM devs will appreciate a lot a bug report (they fixed many lacks of optimizations submitted by me). If you have a link to the PFFT code them maybe I can do that myself.Slide 25:Implicit invariants often hard to track downThen maybe it's a good idea to add such invariants to the dmd front-end code, even before its port to D. Bye, bearophile
Jun 18 2013
On 6/17/13, Andrei Alexandrescu <SeeWebsiteForEmail erdani.org> wrote:youtube: http://youtube.com/watch?v=ntdKZWSiJdYThere seems to be some audio glitching every couple of seconds (at the beginning). I've noticed this in other videos as well. It's mostly minimal though, not much harm done.
Jun 17 2013
On Mon, 17 Jun 2013 11:19:14 -0400, Andrej Mitrovic <andrej.mitrovich gmail.com> wrote:On 6/17/13, Andrei Alexandrescu <SeeWebsiteForEmail erdani.org> wrote:I noticed that during the conference. There were several talks where the mic was giving the AV guys trouble. Each of the speakers was using a clip-on remote mic. Of course, live, it wasn't as big a deal, as we could hear the person talking :) But it would be more glaring for the recording. I'm sure if there are any glitches that omit an important piece of the talk, point them out and the speaker and/or conference attendees can help discern what was being said. -Steveyoutube: http://youtube.com/watch?v=ntdKZWSiJdYThere seems to be some audio glitching every couple of seconds (at the beginning). I've noticed this in other videos as well. It's mostly minimal though, not much harm done.
Jun 17 2013
On 6/17/2013 8:35 AM, Steven Schveighoffer wrote:I'm sure if there are any glitches that omit an important piece of the talk, point them out and the speaker and/or conference attendees can help discern what was being said.I was saying "flip that!".
Jun 17 2013
On Monday, 17 June 2013 at 15:19:27 UTC, Andrej Mitrovic wrote:There seems to be some audio glitching every couple of seconds (at the beginning). I've noticed this in other videos as well. It's mostly minimal though, not much harm done.https://www.youtube.com/watch?v=m6jsXQm5IrM#t=106s :-)
Jun 17 2013
Am Mon, 17 Jun 2013 22:03:09 +0200 schrieb "Joseph Rushton Wakeling" <joseph.wakeling webdrake.net>:On Monday, 17 June 2013 at 15:19:27 UTC, Andrej Mitrovic wrote:"What's this wire doing here? It's dangerous!" *pulls* -- MarcoThere seems to be some audio glitching every couple of seconds (at the beginning). I've noticed this in other videos as well. It's mostly minimal though, not much harm done.https://www.youtube.com/watch?v=m6jsXQm5IrM#t=106s :-)
Jun 17 2013
On Monday, 17 June 2013 at 15:19:27 UTC, Andrej Mitrovic wrote:On 6/17/13, Andrei Alexandrescu <SeeWebsiteForEmail erdani.org> wrote:Yes, there were, and it was rather irritating for me as well. Actually, they even changed my wireless beltpack during the presentation, at the point where there is pretty much silence in the video and they cut to a shot of the bored audience. Davidyoutube: http://youtube.com/watch?v=ntdKZWSiJdYThere seems to be some audio glitching every couple of seconds (at the beginning). I've noticed this in other videos as well. It's mostly minimal though, not much harm done.
Jun 18 2013
On 6/17/13 8:25 AM, Andrei Alexandrescu wrote:You know the drill! reddit: http://www.reddit.com/r/programming/comments/1gie4b/dconf_2013_ldc_the_llvmbased_d_compiler_by_david/ hackernews: https://news.ycombinator.com/item?id=5892652 facebook: https://www.facebook.com/dlang.org/posts/658638807483137 twitter: https://twitter.com/D_Programming/status/346598441230671873 youtube: http://youtube.com/watch?v=ntdKZWSiJdY AndreiHD video up: https://archive.org/details/dconf2013-day03-talk04 Andrei
Jun 17 2013
On Mon, 17 Jun 2013 08:25:50 -0400 Andrei Alexandrescu <SeeWebsiteForEmail erdani.org> wrote:You know the drill! reddit: http://www.reddit.com/r/programming/comments/1gie4b/dconf_2013_ldc_the_llvmbased_d_compiler_by_david/ hackernews: https://news.ycombinator.com/item?id=5892652 facebook: https://www.facebook.com/dlang.org/posts/658638807483137 twitter: https://twitter.com/D_Programming/status/346598441230671873 youtube: http://youtube.com/watch?v=ntdKZWSiJdY AndreiTorrents/links up: http://semitwist.com/download/misc/dconf2013/
Jun 17 2013
... slightly more serious response: really nice talk, David, and thanks for the mention of Dregs. :-)
Jun 18 2013
On 2013-06-17 14:25, Andrei Alexandrescu wrote:You know the drill! reddit: http://www.reddit.com/r/programming/comments/1gie4b/dconf_2013_ldc_the_llvmbased_d_compiler_by_david/ hackernews: https://news.ycombinator.com/item?id=5892652 facebook: https://www.facebook.com/dlang.org/posts/658638807483137 twitter: https://twitter.com/D_Programming/status/346598441230671873 youtube: http://youtube.com/watch?v=ntdKZWSiJdYDavid mentions in the talks that git submodules make it more complicated to do merges. I'm not sure I understand why. git submodules are just regular repositories that are included in other repositories. One can work on these repositories separately, then it shouldn't be much difference. -- /Jacob Carlborg
Jun 19 2013
On 2013-06-17 14:25, Andrei Alexandrescu wrote:You know the drill! reddit: http://www.reddit.com/r/programming/comments/1gie4b/dconf_2013_ldc_the_llvmbased_d_compiler_by_david/ hackernews: https://news.ycombinator.com/item?id=5892652 facebook: https://www.facebook.com/dlang.org/posts/658638807483137 twitter: https://twitter.com/D_Programming/status/346598441230671873 youtube: http://youtube.com/watch?v=ntdKZWSiJdYAbout the Mac OS X support. Is TLS the only problem on Snow Leopard? Have you considered moving the code dealing with TLS from the dynamic linker into the executable? -- /Jacob Carlborg
Jun 19 2013