If each data point is in a seperate file why join them only to split them again ? if your files are nicely arranged so that for each time interval you have eight data files then just read these 8 directly into an AoA. Can you give some examples of what the pre-joined source files are like ? You stand to gain on not shelling out of perl to join and not splitting. If the files are fixed record length there may be even more optimisation possible.
Cheers, R.
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