Server CPU usage doesnt go above 50% per application

[Al_152]

Hello,

Intel MKL testing shows a half CPU usage. Always 50% per 1 app max at this machine.

So, if I have two parallel process from different apps then I will have 100% max CPU usage. But for one - 50% max only.
Taskmgr (windows 7) shows ~100% usage for half threads and ~0% for others one by one.
Other applications are give the same result.

Ive tried:

1. open CPU Power options in Control panel. It has 100% limit value.
2. turn up a process priority to Real time.
3. made sure that executable process has support a hyperthreading

4. other servers based on 2*CPU (Xeon X5675 with Windows 7 and Xeon E5620 with Windows 7) haven't such problem!

Server configuration
CPU 2x OctalCore Intel Xeon E5-2667 v4, 3500 MHz (35 x 100)
MB Supermicro X10DRG-Q, chipset Intel Wellsburg C612, Intel Broadwell-EP, AMI BIOS
Memory Samsung M393A4K40CB1-CRC 32 ГБ DDR4-2400

OS Windows 2016 Server

(with Windows 7 Pro I have the same result)
All hardware drivers are installed.

CPU usage shot is below

CPU1 / Core 1 / SMT 1 100%
CPU1 / Core 1 / SMT 2 0%
CPU1 / Core 2 / SMT 1 100%
CPU1 / Core 2 / SMT 2 0%
CPU1 / Core 3 / SMT 1 100%
CPU1 / Core 3 / SMT 2 0%
CPU1 / Core 4 / SMT 1 100%
CPU1 / Core 4 / SMT 2 100%
CPU1 / Core 5 / SMT 1 100%
CPU1 / Core 5 / SMT 2 0%
CPU1 / Core 6 / SMT 1 100%
CPU1 / Core 6 / SMT 2 0%
CPU1 / Core 7 / SMT 1 100%
CPU1 / Core 7 / SMT 2 0%
CPU1 / Core 8 / SMT 1 100%
CPU1 / Core 8 / SMT 2 0%
CPU2 / Core 1 / SMT 1 100%
CPU2 / Core 1 / SMT 2 0%
CPU2 / Core 2 / SMT 1 100%
CPU2 / Core 2 / SMT 2 0%
CPU2 / Core 3 / SMT 1 100%
CPU2 / Core 3 / SMT 2 0%
CPU2 / Core 4 / SMT 1 100%
CPU2 / Core 4 / SMT 2 0%
CPU2 / Core 5 / SMT 1 100%
CPU2 / Core 5 / SMT 2 0%
CPU2 / Core 6 / SMT 1 100%
CPU2 / Core 6 / SMT 2 0%
CPU2 / Core 7 / SMT 1 100%
CPU2 / Core 7 / SMT 2 0%
CPU2 / Core 8 / SMT 1 100%
CPU2 / Core 8 / SMT 2 0%

Kind Regards,
Al

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