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From: Tim Roberts on 28 Jan 2010 23:06
"Chris M. Thomasson" <no(a)spam.invalid> wrote:

>"Tim Roberts" <timr(a)probo.com> wrote:
>
>> persres <persres(a)googlemail.com> wrote:
>[...]
>>>3) how do I allocate cache-aligned memory in heap?. I believe it is
>>>_aligned_malloc?. Is there any C++ call?
>>
>> _aligned_malloc works just fine in C++. You can always use placement
>> "new"
>> with it:
>>
>> MyObject pobj = new (_aligned_malloc(sizeof MyObject)) MyObject;
>>
>> Note, however, that cache-aligning an object is not a terribly useful
>> thing to do.
>
>I am curious as to what makes you say that? Padding critical data-structures
>to L2 cache lines and aligning them in memory on cache line boundaries can
>be __essential__ if you are interested in scalability and performance.

I am being too obscure. Aligning arrays and data structures is clearly a
vital tactic in high performace applications. However, C++ objects often
have extra "surprises" that add an extra element.
--
Tim Roberts, timr(a)probo.com
Providenza & Boekelheide, Inc.
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