Re: Functional Local Static Zero Initialization - When?
On Dec 6, 1:44 pm, Marcel M=FCller <news.5.ma...@spamgourmet.com> wrote:
Chris M. Thomasson schrieb:
Doesn't the X86 lock prefix force a memory synchronization?
Yeah:
http://developer.intel.com/products/processor/manuals/318147.pdf
you are right. The coherent caches of Intel CPUs do their Job.
I am still unsure whether this was a good idea with respect to
scalability.
There's a lot more that just cache coherency involved. The cost
of the Intel guarantees is negligible as long as all of the
cores are on a single chip. It's very, very costly if they
aren't. The reason why Intel gives this guarantee is that not
giving it would break most Windows software (and Windows is
still the biggest market for x86 processors). The reason why no
one else does is that it doesn't scale, and mutli-core using
multiple chips has been state of the art for at least ten years
now.
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