On Thu, 22 Mar 2007, Tzahi Fadida wrote:
On Thursday 22 March 2007 16:18, Peter wrote:
On Thu, 22 Mar 2007, Tzahi Fadida wrote:
Advocating is a strong word, i was suggesting. How exactly would you
address 128gb,256gb? Unless of course your system board and CPU
supports such sizes...
The board does not care about sizes. Disk requests are serialized and
they can be any lengths. Implementing a 1024 bit wide address counter to
be pushed out serially to hardware is trivial even with an 8 bit cpu
from 20 years ago. The problem is speed and size. Anything that fits in
And where prey tell, you can go to a store today and get a computer that
support addressing of 1024 bits RAM?
Wht are you assuming that the computer needs to be able to address 1024
bits of RAM if the address counter is made that wide (in software). You
can easily map this 1024 bit address space so one part covers actual
ram, another the video ram, another is mapped to a network drive,
another ... it's called virtual memory, and it does not say anywhere
that it is limited to one level. Of course this costs time. But ...
Being realistic, you have a 32bit system in place and all you need is to
implement the 2 or 4 gb blooming filter, why buy an insanely expansive new
computer instead of just adding some PCI with some memory that would be good
enough for your needs? Like an Asus battery backed ram drive in 50$ + as much
ddrs you need. I think 1gb~=500nis *4 = 2000. ANS + 50$ = 2250nis.
Because you don't need a Blooming filter 4GB in size. You need one
Blooming filter 500MB in size, two 256MB, four 128MB, and the last two
fit into the second 800NIS PC (the first 500MB fits into the first).
Anyway the B. filter is not good for storing data but it could be good
to check f.ex. hash keys present/absent in a cache quickly and cheaply.
The idea is that there is no canned solution. There is hard work to be
done to make something support 30E6 records in real time. A Bloom filter
may be a part of it. Maybe not. But SQL is almost certainly a part of
the problem and not of the solution ... again I'm not an expert here.
Peter
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