On Fri, Dec 15, 2006 at 12:15:59PM +0000, Gregory Stark wrote: > There are various attempts at providing better timing infrastructure at low > overhead but I'm not sure what's out there currently. I expect to do this what > we'll have to do is invent a pg_* abstraction that has various implementations > on different architectures. On Solaris it can use DTrace internally, on Linux > it might have something else (or more likely several different options > depending on the age and config options of the kernel). I think we need to move to a sampling approach. setitimer is good, except it doesn't tell you if signals have been lost. Given they are most likely to be lost during high disk I/O, they're actually significant. I'm trying to think of a way around that. Then you don't need a cheap gettimeofday at all... Have a nice day, -- Martijn van Oosterhout <kleptog@xxxxxxxxx> http://svana.org/kleptog/ > From each according to his ability. To each according to his ability to litigate.
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