Comparison summary between TCP and MPL protocols
	   				MPL		TCP/IP	    
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differs in sink/disk modes   		no          yes when nhost >=8
sensitive to block/buffer size		yes		no
sensitive to the numner of phases	less		very
bandwidth throughput (maximum MB/s) 
 nhost = (2,4,8)		   (5.6,15.5,65.3)  (28.6,89.2,330.4)
bandwidth throughput (average ratio)	1       	5
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comparison plot