I used the above code with some minor modifications : i remove the day at the beginning of each line to have the time in front -> ready to be sorted and no substr needed!

results are:

The biggest gain (more than 40 sec) was on using the while on the handle instead of the list context with grep

Thanks a lot !!!

In reply to Re^4: How to improve speed of reading big files by Anonymous Monk
in thread How to improve speed of reading big files by korlaz

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