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Scalability and hashtables and databases

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Hello,

I come to an interresting subject, i want to talk about the
scalability on multicores of the parallel hashtables and
databases engines... i am wondering how can you say that a parallel
hashtable can scale on multicores if the random key acesses are
cache unfreiendly and the parallel hashtable is memory bound ? i think
since the parallel hashtable is memory bound and the random accesses are 
cache unfreindly that means that the parallel hashtable will not scale 
on multicores, when you are testing your parallel hashtable, you have 
also to test the cache misses on the data, cause i think that the data 
is part of the hashtable application, i mean the parallel hashtable 
concept is highly interconnected with the way that the data is accessed 
randomly in a cache unfreindly manner and the  hashtables concept is is 
highly interconnected with the way the hashtable data is accessed in 
memory bound manner, so this why i say that parallel hashtables are not 
scalable on multicores, it's the same for database engines , since they 
are disk bound, so they are not scalable, and even if they are in-memory 
databases they will be memory bound and cache unfreindly, so databases 
are not scable either on mutilcores.



Thank you,
Amine Moulay Ramndane

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Scalability and hashtables and databases aminer <aminer@toto.net> - 2013-10-21 17:29 -0700
  Re: Scalability and hashtables and databases aminer <aminer@toto.net> - 2013-10-21 17:34 -0700
    Re: Scalability and hashtables and databases "Chris M. Thomasson" <no@spam.invalid> - 2013-10-21 15:10 -0700

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