jfs jfsurban

jfsurban / latency.txt

Created July 22, 2013 01:40 — forked from jboner/latency.txt

	Latency Comparison Numbers
	--------------------------
	L1 cache reference 0.5 ns
	Branch mispredict 5 ns
	L2 cache reference 7 ns 14x L1 cache
	Mutex lock/unlock 25 ns
	Main memory reference 100 ns 20x L2 cache, 200x L1 cache
	Compress 1K bytes with Zippy 3,000 ns
	Send 1K bytes over 1 Gbps network 10,000 ns 0.01 ms
	Read 4K randomly from SSD* 150,000 ns 0.15 ms

jfsurban / wm_enumarate_evailable_connections.cpp

Created November 12, 2013 09:33

Enumerate available connections on WM5 device - ConnMgrQueryDetailedStatus

	CONNMGR_CONNECTION_DETAILED_STATUS *pConnMgrDet;
	HRESULT hResult;
	DWORD dwBufferSize=0;/

	hResult=ConnMgrQueryDetailedStatus(pConnMgrDet,&dwBufferSize);
	if(hResult==(HRESULT_FROM_WIN32(ERROR_INSUFFICIENT_BUFFER)))
	{
	pConnMgrDet=(CONNMGR_CONNECTION_DETAILED_STATUS *)new BYTE[dwBufferSize];

	hResult=ConnMgrQueryDetailedStatus(pConnMgrDet,&dwBufferSize);

jfsurban / ColorUtils.java

Created June 19, 2014 02:33 — forked from alexfu/ColorUtils.java

	public class ColorUtils {
	private static final double LM_RED_COEFFICIENT = 0.2126;
	private static final double LM_GREEN_COEFFICIENT = 0.7152;
	private static final double LM_BLUE_COEFFICIENT = 0.0722;

	public static int calculateRelativeLuminance(int color) {
	int red = (int) (Color.red(color) * LM_RED_COEFFICIENT);
	int green = (int) (Color.green(color) * LM_GREEN_COEFFICIENT);
	int blue = (int) (Color.blue(color) * LM_BLUE_COEFFICIENT);
	return red + green + blue;