[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