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Subject: Re: Hash Table question

Author: Vasik Rajlich

Date: 08:18:47 02/06/06

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On February 05, 2006 at 23:49:39, Jay Urbanski wrote:

>On February 05, 2006 at 06:10:55, Vasik Rajlich wrote:
>
>>On February 04, 2006 at 12:19:33, dhanial wrote:
>>
>>>What is the best hash table settings for rybka for 10 to 15 min games and for 1
>>>to 3 min games.
>>
>>For all time controls, as high as possible, provided that there is no swapping
>>to disk.
>>
>>Vas
>
>This is not actually true on all systems.  For instance, if you have dual
>processor Opteron it would behoove you to keep the hash size to under half your
>physical memory at least, because Opteron systems are NUMA and access to memory
>attached to the non-local CPU is higher than latency to memory attached to the
>CPU your process is running on.  It's about 60-80ns latency for local memory and
>about 100-120ns for 1-hop away.

Aha, thanks, it's good to know.

Vas




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