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On 17/10/2010 2.57, Alexander Gladysh wrote:
I've got a large file  (3M entries, 250 MB) with data.
Each entry is one line with a small Lua table:

This may may be completely off the mark, but just in case...
As you noticed), it sounds like swap thrashing; have you kept an eye on memory allocation?

I'd try loading a group of (say 1000) lines at a time and forcing a gc after each group to prevent allocation bloating.