Oh. And the final piece of the discussion about IO.

I moved one of the two big files over to my old, slower, fragmented drive and re-ran the same test. Now, despite that reading from the older drive is slower, the times taken to read both files concurrently and sequentially are almost identical even though they are both connected via the same interface:

[15:49:22.32] E:\test>c:piotest.pl big.csv big.tsv
big.csv:[167772161] 407.047676086
big.tsv:[100000001] 417.717574120
big.csv:[167772161] 82.103285074
big.tsv:[100000001] 81.984734058

[16:31:59.04] E:\test>c:piotest.pl c:big.csv big.tsv
c:big.csv:[167772161] 138.239881039
big.tsv:[100000001] 85.378695965
c:big.csv:[167772161] 141.292586088
big.tsv:[100000001] 83.687027931

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In reply to Re^3: Using threads to process multiple files by BrowserUk
in thread Using threads to process multiple files by anli_

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