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"heavy lock contention"?



sorry this is not Debian question, but could you
kindly explain "heavy lock contention", and especially
the "heavy" in it? 

The standard piped streams, while safe and reliable,
leave much to be desired in terms of their
performance. Several factors contribute to this
performance problem:

Array-based operations simply call through to an
inefficient byte-by-byte copy operation. This
operation is itself synchronized, resulting in
extremely heavy lock contention.




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