Hideki Kato wrote:
David Fotland: <[EMAIL PROTECTED]>:
The scalability study showed that mogo gains almost 100 rating points per
doubling of performance.
But on CGOS, there is mogo 1 CPU and mogo 4 CPU. I would expect the 4 CPU
mogo to be 150 rating points or more higher than 1 CPU. But it is actually
only 40 points higher.
I'm also wondering this for months.
One reason of this discount is that the MoGo bros running on cgos are
the _big versions. By my obserbation (they are running on my pcs and
both are Q6600/3GHz with different mother boards), mogo_big_4core's
perallelism is around 300% (by top command), perhaps due to its
heavier uct part (just my guess).
I guess this is because in the rating study mogo was mostly playing other
mogo versions. A the faster mogo can see everything the weaker mogo sees,
and more.
I'm not sure. Mogo_big_4core's winning rate against mogo_big_1core is
about 60% (1641 / 2743) which corresponds only +70 ELO and current
rating difference on cgos is about 40, as you wrote. According to the
scaling rule of mc playouts, it should be 160 ELO (log2(3) * 100 =
158.5).
But against other programs on CGOS, there will be weaknesses common to both
fast and slow mogo, that other programs might exploit.
Is the true scalability of mogo (against a variety of programs, or against
people) less than the rating study indicates?
I believe their current ratings on cgos indicate so.
You should look on the All Time Ratings list to get a more correct
picture. I will try to update it today but we still have 551 games on
the all time list for mogo-big-4 core:
It shows mogo-big-4core as 2563 +35 -35
and mogo-big-1core as 2480 +24 -24
Also, don't forget that 4 cores are not as efficient as 1 core, so
we shouldn't expect this to be as good as the 1 core version running 4x
longer. I would expect it to be much better than 2x though -
perhaps the mogo team can comment on that.
- Don
Hideki
David
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[EMAIL PROTECTED] (Kato)
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