the first step is going to be to reduce the 8 million lines to what we're guessing is 400,000 unique sets of characteristics,

How long wil it take you to do that reduction?

Because with the additional efficiencies outlined in 760218 & 760226, and a little threading or forking, you could distribute this over your 8 processors and have the full cross product very quickly.

Of course, that would be a huge amount of data to further process, but maybe you could apply some (cheap) selection criteria prior to output.

Anyway, good luck!

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In reply to Re^3: Huge data file and looping best practices by BrowserUk
in thread Huge data file and looping best practices by carillonator

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