It really does sound like you're output is buffered. Did you select the filehandle before changing $|? If not, you're setting autoflushing for the currently selected handle (presumably STDOUT).

open(FILE, ...

{
   my $old_selected = select(*FILE);
   $| = 1;
   select($old_selected);
}

print FILE ...

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In reply to Re: Odd behaviour from print statement by ikegami
in thread Odd behaviour from print statement by periapt

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