Fri, July 24, 2009, 05:26 PM under Windows
As you know by now, Windows 7 supports up to 256 logical processors
(a 4-fold increase
from previous versions). A few months ago I posted my screenshot of a system with 128 cores
and reader kotsoft asked why the CPU utilization was at 50%.
The reason is that I was running a straightforward .NET 4 app that used TPL and the CLR 4 ThreadPool does not take advantage of more than 64 cores. Digging deeper reveals that there are certain new (native obviously) APIs
that an application must use to go beyond the 64-core support and specifically the ones described here about processor groups
– the CLR is not utilizing them in this release.
I wonder who will be the first to wrap these functions from managed code and show an example of their usage…