When the program output is directed to the terminal the filehandle associated with the output will be in line-buffered mode but would be block-buffered otherwise (when the output is directed to a filehandle other than the terminal STDOUT)...Buffering can not be switched off but setting the output-autoflush variable to non-zero would make the print statement not wait for the buffer to flush rather than directly outputting to the file associated with the filehandle.
I understand that 'out of memory!' would flash when the buffer is not autoflushed in such cases and that there's large amount of data, now, if I am mistaken or cloudy on this one (I believe I am somehow) you're welcome to go ahead and correct/clarify for I am basically from a non-IT backrgound...
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