I modified the code in s_lock.c to remove the spins #define SPINS_PER_DELAY 1
and it doesn't exhibit the behaviour This effectively changes the code to while(TAS(lock)) select(10000); // 10ms Can anyone explain why executing TAS 100 times would increase context switches ? Dave On Tue, 2004-04-20 at 12:59, Josh Berkus wrote: > Anjan, > > > Quad 2.0GHz XEON with highest load we have seen on the applications, DB > > performing great - > > Can you run Tom's test? It takes a particular pattern of data access to > reproduce the issue. -- Dave Cramer 519 939 0336 ICQ # 14675561 ---------------------------(end of broadcast)--------------------------- TIP 8: explain analyze is your friend