It's not the buffer/cache (which has a configurable size) that's the problem; it's the index. Its size is proportional to highest line index encountered, and it can't be limited. For files with a small average line length (e.g. source code), the index uses more memory than the actual file. For example, if you read through a 20 GiB file using Tie::File, the index can end up using 20 GiB of memory (on top of the 2 MiB).

In reply to Re^3: Loading a part of the file to array using Tie::File by ikegami
in thread Loading a part of the file to array using Tie::File by ansh007

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