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digitalmars.D - Cilk Plus and more

reply bearophile <bearophileHUGS lycos.com> writes:
An computer science popularization article about Cilk and related matters, that
I did miss, from the August:

http://software.intel.com/en-us/articles/data-and-thread-parallelism/

It explains the not too much hard to undestand task parallelism with the spawn
and sync keywords, the parallel for loops, that haven ot fully enforced
constraints:

The compiler will detect violations and enforce these restrictions in most
cases. Exceptions are when the comparison value and index variable are updated
through pointers.<

The Intel Cilk Plus Array Notation is similar to the vector syntax of D, you use: a[:] = b[:] + c[:] Instead of: a[] = b[] + c[] But the complete syntax supports a stride too: array_base[begin:length:stride] That allows code like this, similar to the Python NumPy one: a[0:5][3][0:8:2] Intrinsic functions like _sec_reduce_add remind me the desire for a sum() in Phobos: int[] a; int total = sum(a); // no exception here assert(total == 0); The Intel Cilk Plus Elemental Function annotated with __declspec(vector) seem similar to D2 pure functions, but the compieler seems to use them better (so it's not a matter of language, but implementation). I have a D version too of the Ambient Occlusion Benchmark (AOBench), of course. In the end a 16.5x with a 4-core CPU is nice. Bye, bearophile
Dec 14 2011
parent reply "F i L" <witte2008 gmail.com> writes:
bearophile wrote:
 I have a D version too of the Ambient Occlusion Benchmark 
 (AOBench), of course.

I would really like to see that. Is it OpenGL or DirectX (or CPU)?
Dec 14 2011
parent bearophile <bearophileHUGS lycos.com> writes:
F i L:

 I would really like to see that. Is it OpenGL or DirectX (or CPU)?

CPU single-core. http://codepad.org/YgPFb3xj Bye, bearophile
Dec 14 2011