-blockprofilerate n
	    Control the detail provided in goroutine blocking profiles by
	    calling runtime.SetBlockProfileRate with n.
	    See 'go doc runtime.SetBlockProfileRate'.
	    The profiler aims to sample, on average, one blocking event every
	    n nanoseconds the program spends blocked. By default,
	    if -test.blockprofile is set without this flag, all blocking events
	    are recorded, equivalent to -test.blockprofilerate=1.