I might have a theory on that subject. With HT you share the same execution blocks among two pipelines (meaning you are trying to balance twice as many threads/instructions and so on, without increasing reorder caches/registers/data and instruction caches and other important factors). On a normal PC you have threads with different profiles - media streaming, integer calculations and so on, so most tasks don`t overlap as much and you feel a big boost. With the database (or any other dedicated server for that matter), on the other hand, you have basically the same profile for all threads and you starve the CPU from certain blocks/registers, while you don`t really utilize the others. You also have some kind of synchronization between the two pipelines. When you have a single user (filling the info in the database) you don`t feel the difference because it is basically the same CPU core doing the work.
I could be wrong on that one, but under ultra heavy loads I guess all those things will be noticeable. > Nobody was able to explain why such big difference. > Interesting that the performance was similar in both machines when > loading the > database with information. The huge difference only appeared when > "using" the > database. > > []s > Carlos > http://www.firebirdnews.org > FireBase - http://www.FireBase.com.br -- Using Opera's revolutionary email client: http://www.opera.com/mail/ ------------------------------------------------------------------------------ Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_d2d_nov Firebird-Devel mailing list, web interface at https://lists.sourceforge.net/lists/listinfo/firebird-devel
