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By indexing tricks I was referring to perl I am aware of the indexing that happens in mysql. Also the time I gave in the previous post was for your previous program. Your new program takes 4297 wallclock secs (4294.19 usr + 0.29 sys = 4294.48 CPU).

As for your benchmark results that you reported, do you consider those to be good or bad? How much longer is that relative to the time it takes just to read the larger input file and do little else

It does not take long to read the larger file what takes longer is the looping and in matching. Previously there were two loops (a for inside a while) but now there are three (a for inside a for inside a while) due to HOHOH. For a quickfix solution this is ok but I would have to eventually use mysql but even in mysql I would have to update a particular class match every time if a particular position falls in that range for that gene but hopefully it would be faster than this.

Thanks again for all the help.

In reply to Re^4: Comparing and getting information from two large files and appending it in a new file by perlkhan77
in thread Comparing and getting information from two large files and appending it in a new file by perlkhan77

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