Jon Harrop wrote:
Roedy Green wrote:
On Fri, 5 Jun 2009 18:15:00 +0000 (UTC), Kaz Kylheku
<kkylh...@gmail.com> wrote, quoted or indirectly quoted someone who
said :
Even for problems where it appears trivial, there can be hidden
issues, like false cache coherency communication where no actual
sharing is taking place. Or locks that appear to have low contention and
negligible performance impact on ``only'' 8 processors suddenly turn into
bottlenecks. Then there is NUMA. A given address in memory may be
RAM attached to the processor accessing it, or to another processor,
with very different access costs.
Could what you are saying be summed up by saying, "The more threads
you have the more important it is to keep your threads independent,
sharing as little data as possible."
I see no problem with mutable shared state.
In which case, Jon, you're in a small minority.
AHS
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