Hi, I am trying to parse a large (4.1 GB) file. In a nutshell, I accept input via STDIN (for illustration purposes, let's say, cat file | script.pl) and the perl script takes each line, does black magic to it, and outputs it to a file. it is taking too long to do this. After weeks and weeks of trying various ways of speeding things up, I think at this point, the fastest way to accomplish what I am doing is to read in STDIN, and throw the lines out to multiple workers. I don't know if this would be expressed as being "threaded" or fork'd. So STDIN to boss, lines are given to X number of workers, and as each comes back, it prints to the file, and is given the next line. One condition I have is that the lines have to be output to the file in the order they came in. I think this is possible, but my perl-fu is very, very weak, and searching for this on google for days has left me weary. I have found things that are close, and have gotten very close. I think though that i will collapse from exhaustion, or have a mental breakdown if I don't reach out for help :-) Thank you. p.s. I know there is no code here, and no sample data or anything like that. I don't want to get wrapped around the axle on semantics or stylistic differences in regular expressions optimization or anything like that :-) The input data is not overly complex (say, 100 ascii characters) and the output data is not overly complex (again ~100 ascii characters) no binary data or anything weird like that. If anyone feels exact specifics are necessary than I will happily provide anything required.

In reply to How do you parallelize STDIN for large file processing? by forsaken75

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