On Tue, 13 Nov 2012 14:18:22 +0000, Poul Dige <p...@tabulex.dk> wrote: > I could put a screen dump here of the Windows 2008R2/63 task manager with > AMD Opteron 6274, 2x16 core running FB2.5.1 SC/32 bit (due to some 32 bit > UDF). I don't know if you are interested at a gaze. We see exactly the same > kind of usage, 8 cores are in use and 24 are more or less doing nothing.
> > However, the cores in use are not maxed out - so it COULD be something > with power management that the OS doesn't want to activate more CPU's than > necessary. I can't tell about that for sure. I know that Windows 8 will 'park' cores if there is no work for them, and it will try to assign threads to the active/unparked cores first. When the load exceeds a certain threshold, then it will unpark an additional core and schedule threads to that (at least that is what I observed on my Windows 8 Pro on an 8 'core'(*) FX-8120 at home), as far as I know Windows 2008 server also has similar scheduling algorithms (depending on the processor). The reason is simple: it conserves some power, and some processor have a kind of speed boost when not all cores are loaded (ie: it will 'overclock' the active cores because there is more thermal 'headroom' as not all cores are powered and generating heat). This allows for faster processing if work isn't really multithreaded, and doesn't actually benefit much from running multicore. (*): Actually the AMD FX is not fully 8 core, it is more like a 4 core which allows 2 threads to be scheduled simultaneously by having same features/instructions twice, and other features/instructions only once per core. Mark ------------------------------------------------------------------------------ Monitor your physical, virtual and cloud infrastructure from a single web console. Get in-depth insight into apps, servers, databases, vmware, SAP, cloud infrastructure, etc. Download 30-day Free Trial. Pricing starts from $795 for 25 servers or applications! http://p.sf.net/sfu/zoho_dev2dev_nov Firebird-Devel mailing list, web interface at https://lists.sourceforge.net/lists/listinfo/firebird-devel
