[computer-go] Re: Mogo scalability

[Don Dailey]

Ok,  I made some more space on the server  -  we should be good for a 
few more weeks.  

- Don


Don Dailey wrote:
> 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)
>>> _______________________________________________
>>> computer-go mailing list
>>> computer-go at computer-go.org
>>> http://www.computer-go.org/mailman/listinfo/computer-go/
>>>
>>>   
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