[CentOS] strict memory

John R Pierce pierce at hogranch.com
Thu Oct 16 17:42:52 UTC 2008

Mag Gam wrote:
> Hi John:
> Well, we run a lot of statistical analysis and our code loads a lot of
> data into a vector for fast calculations. I am not sure how else to do
> these calculations fast without loading it into memory. Thats why we
> have to do it this way.

well, if you got several processes that each need 32GB in a 64GB 
machine, you're gonna end up swapping.

the traditional way of doing this sort of thing on limited memory 
machines was to take a sequential pass through the data, calculating the 
statistics on the fly.   I know that kind of thing is very difficult for 
some algorithms (FFT's are notorious for being unfriendly to sequential 
processing), but for many algorithms, a few sequential passes of 
calculations can be /faster/ than random access and swapping when theres 
memory/process contention.

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