There are some caveats with buffering on STDOUT. The behavior changes if Perl figures that STDOUT has been redirected to something not a physical console. Consider:
print "$_ buffered xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx\n";
print STDERR "$_ unbuffered \n";
When run from the command line, STDOUT is indeed unbuffered and you see alternating buffered/unbuffered statements. However for example if I run this in Textpad (my editor on Windows - I think similar to Notepad++) and have it capture the output, STDOUT is buffered. And the first buffered line is output after about 88 lines. I conclude that on my Windows system the buffer is about 8KB. So it depends upon where STDOUT is directed to.
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(5)As of 2017-01-25 00:10 GMT