On Mon, Jun 1, 2009 at 4:57 PM, Michael Williams <michaelwilliam...@gmail.com
<mailto:michaelwilliam...@gmail.com>> wrote:
I've optimized my disk access to the point where I'm mostly CPU
limited now, even when using a standard hard disk instead of an
SSD.
I can now create trees of up to about 30 billion nodes, which
would
take about a week. The simulation rate is continuously going
down
because so much time is spent in UCT loops in the huge tree.
That's impressive. Are you doing things which move parts of the
tree onto the disk and back when needed? I'm curious about the
details!
- Don
Don Dailey wrote:
On Mon, Jun 1, 2009 at 11:22 AM, Isaac Deutsch <i...@gmx.ch
<mailto:i...@gmx.ch> <mailto:i...@gmx.ch
<mailto:i...@gmx.ch>>> wrote:
> Well, I'll take that over crashing with an out-of-
memory
error. :)
Still, pruning seems better to me and has the same
effect. ;p
But is it better? I think it's not so obvious without
thorough
testing.
Pruning throw away information that is lost forever and may
need
to be recalculated. Requiring more simulations does not
throw
out results, but results in some inefficiencies. So it's
not
clear to me which is better - it may even be that it
depends on
how much you push it. I am just guessing but I would guess
that pruning is better in the short term, worse in the longer
term. Imagine a search at a corespondence level, where the
computer thinks for 24 hours. Which method is best
there? Could you use hard disk or SSD? Using some kind
of caching
system, where you relegate the oldest unvisited nodes to the
hard dirve. It may be that nodes you might normally prune
are
unlikely to get used again but if they do you still have the
data. This is no good unless you can guarantee that the
disk
is used very infrequently - but with SSD it may be more
practical.
- Don
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