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2012-10-23T03:26:39  <mcstar> nvm, i figured it out
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2012-10-23T03:53:56  <madisen> does anyone if know if there is another ai challenge happening?
2012-10-23T03:54:04  <mcstar> not here
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2012-10-23T06:47:15  <antimatroidl1> mcstar: you could be more specific and say not currently planned
2012-10-23T06:47:21  <antimatroidl1> we don't want people never coming back
2012-10-23T06:47:32  <mcstar> too late
2012-10-23T06:47:38  <antimatroidl1> i mean for future reference ;)
2012-10-23T06:47:46  <mcstar> i will forget, sorry
2012-10-23T06:47:50  <antimatroidl1> :|
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2012-10-23T06:47:54  <mcstar> XD
2012-10-23T06:48:03  <antimatroidl1> i got a new gap on my skateboard today
2012-10-23T06:48:09  <antimatroidl1> gap all the things
2012-10-23T06:48:35  <mcstar> i dont follow
2012-10-23T06:48:54  <mcstar> gap? like a little crack?
2012-10-23T06:49:01  <mcstar> or slit?
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2012-10-23T08:13:41  * mleise is obsessed with Sudoku micro-optimization
2012-10-23T08:14:41  * mleise found, that a simple Sudoku-type loop sees 66% overhead if the Sudoku board data structure crosses a memory page boundary
2012-10-23T08:14:57  <mcstar> jesus
2012-10-23T08:15:07  * mleise thinks that it may be the memcpy in it
2012-10-23T08:15:22  <mcstar> im working on this http://hpaste.org/76651
2012-10-23T08:18:05  <mleise> aha, looks like lisp to me
2012-10-23T08:18:35  <mleise> and it wasn't the memcpy. I really have to allocate these Sudoku structures on the heap, to get the alignment right
2012-10-23T08:18:47  * mleise twiddles with the code
2012-10-23T08:19:29  <mcstar> cant you add more smartness to the solver without using templates?
2012-10-23T08:20:27  <mleise> yes, I'm rewriting it line by line without many templates
2012-10-23T08:21:04  <mleise> e.g. I'm trying to detect which particular line adds how much to the run time
2012-10-23T08:21:23  <mleise> and these 66% on badly aligned memory is pretty harsh
2012-10-23T08:22:52  <mcstar> mleise: look at the memory allocation schemes on the shootout page
2012-10-23T08:23:01  <mcstar> well, those are c/c++
2012-10-23T08:23:09  <mcstar> idk if they apply to D at all
2012-10-23T08:23:23  <mleise> sure, nothing stops me from using C malloc
2012-10-23T08:23:35  <mcstar> no, those are compiler annotations
2012-10-23T08:23:40  <mleise> oh
2012-10-23T08:23:55  <mleise> in which program in particular ?
2012-10-23T08:24:07  <mcstar> i think in the mandelbrot program for sure
2012-10-23T08:24:37  <mcstar> i should have said, gcc specific, not c/c++
2012-10-23T08:25:57  <mleise> this one ? http://shootout.alioth.debian.org/u32/program.php?test=mandelbrot&lang=gcc&id=4
2012-10-23T08:26:43  <mleise> it uses posix_memalign, a pragma for multi-threaded execution and SSE vectors (__builtin_ia32_...)
2012-10-23T08:27:55  <mcstar> __attribute__ (
2012-10-23T08:29:03  <mcstar> ok, if its posix...
2012-10-23T08:29:06  <mleise> yeah, those are just to get some SSE vectors
2012-10-23T08:30:16  <mleise> I practically need 1024 bytes alignment. I _think_ the D garbage collector hands out memory blocks like this (i.e. aligned to the next power of 2 of the block size) for internal reasons
2012-10-23T08:32:15  <mleise> oh, while that seems to be true, I get the worst performance if it *is* aligned exactly to a page boundary
2012-10-23T08:32:32  <mleise> wth?
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2012-10-23T16:46:37  <andermall> hello..
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