On Sat, 04 Oct 2008, Szak�ts Viktor wrote: Hi Viktor,
>>> [ total application time: ]........................43.00 ..37.75 >>> [ total real time: ]...............................37.47 ..31.09 >> I would seriously check how MSVC measure time. >> In ST build "total application time" should be lower then >> "total real time". I do not know why you have such results. >> Maybe MSVC C-RTL executes some internal threads? > I was also wondering why is there a big difference at all, > this used to happen in virtual machines only so far. > I really don't know. > BTW, I'm trying to guess it since long, but I couldn't > yet find the answer what is the difference between these > values, especially in ST builds. "application time" is CPU time given to process by OS. It should not contain the time CPU spends executing other processes. "real time" is just a _real_ time. In single CPU machine and multi process OS "real time" is always slower or equal to "application time" because it does not contain time when other processes where executed. Of course sometimes due to rounded total results you can see few milliseconds more. When you have more then one CPU used by application simultaneously in MT program then it can be bigger because. Your results suggest that MSVC uses its own helper thread or the cost of virtual machine executed on other CPU is added to application time. In such case running more then one thread will reduce the VM performance and final results are worse then in real world. Anyway it is hard to compare such results and take some decisions because they can be strongly dependent on VM implementation. best regards, Przemek _______________________________________________ Harbour mailing list Harbour@harbour-project.org http://lists.harbour-project.org/mailman/listinfo/harbour
