Unable to use more than one processor group for my threads in a C# app

Question

Hi,
I set my .Net 4.5 (or 4.5.1) App.Config to:
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<runtime>
<Thread_UseAllCpuGroups enabled="true"></Thread_UseAllCpuGroups>
<GCCpuGroup enabled="true"></GCCpuGroup>
<gcServer enabled="true"></gcServer>
</runtime>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.1"/>
</startup>
</configuration>
I run my app on a windows server 2012 with a NUMA architecture: 2 x [cpu Xeon E5-2697 v3 at 14 cores each with Hyper Thread activated] => 2 x 14 x 2 = 56 Logical Processors.
This is TaskManager screenshot:
My app start 80 threads either from "Thread Class" or "Parallel.For" and in both case it only takes 28 Logical Processors, all from the same Processor Group.
According to MSDN documentation
and
Stephen Toub answer, it should use every Logical Processor of every Processor Group.
Why does the Task scheduler assign my threads on only one Processor Group?
I also reported this question to
StackOverflow which have a lot more information.
Eric Ouellet

Answer 1

One thing before all, is that I suggest that you think through your security model before implementing it in UCM. You should ask yourself questions like :
- Is security really based on department ?
- Why two departments need to have access to the same category of document ?
- Is it really security that I need or classification ? Is it a problem if Accouting have access to Finance or you just don't want Marketing documents in a finance related search ?
- Maybe what you want is that finance guys to have access to marketing document.
Without a clear business security model, it's hard to find a UCM security model as it is impossible to associate 2 security groups to one document.