hellerbarde

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

monkeycycle

	function formatSecondsAsTime(secs, format) {
		var hr  = Math.floor(secs / 3600);
		var min = Math.floor((secs - (hr * 3600))/60);
		var sec = Math.floor(secs - (hr * 3600) -  (min * 60));

		if (hr < 10)   { hr    = "0" + hr; }
		if (min < 10) { min = "0" + min; }
		if (sec < 10)  { sec  = "0" + sec; }
		if (hr)            { hr   = "00"; }