[computer-go] Re: Mogo scalability

[Don Dailey]

I'm trying to update the all-time ratings list for CGOS but I have a 1 
gig limit on the server and CGOS has reached it.    So I'm going to 
prepare this off-line.   So it should be up later.

I'm not sure if CGOS will continue to operate during the week,  but I 
don't have time to clean it up and I will be gone for the week.   
Hopefully,  it will continue to run until I get back.    I may be able 
to do some minor cleanups in order to help it continue.

- Don




Don Dailey wrote:
>
>
> Hideki Kato wrote:
>> David Fotland: <065201c8adff$2b4a8970$81df9c50$@com>:
>>  
>>> 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
>>>
>>>
>>> _______________________________________________
>>> computer-go mailing list
>>> computer-go at computer-go.org
>>> http://www.computer-go.org/mailman/listinfo/computer-go/
>>>     
>> -- 
>> gg at nue.ci.i.u-tokyo.ac.jp (Kato)
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>>
>>   
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