Arquitetura Intel® Many Integrated Core

Xeon Phi 7120P always runs at lowest frequency

I recently installed one 7120P in one of my servers. It seems working fine, but I noticed that it always runs at the lowest available frequency. Even I am running the benchmark application coming with intel compiler, the frequency stays at 0.57GHz.

Any idea about this?

Here is some information about my machine

Expected performance gain ... 5960X vs Xeon Phi?

Hello... 
I am a retired theoretical physical chemist with a long association with computers and computing.
As briefly as possible, my interests are in the behavior of fluids at a phase boundary, such as a real gas at a solid
surface: the attractive forces of the solid cause an increased concentration (density) of the gas in the region near the surface, 
a measureable phenomenon called "adsorption". Thermodynamics requires that, at equilibrium at a constant temperature and 

Poor MKL Dfti complex to complex performance

Hello,

I'm new to MIC programming and trying to get a grip on how to do things with the beast. I stumbled accros very bad FFT performance (using a matrix size often used at our institution) for dfti complex to complex transforms. In the following. no OMP, KMP, MKL variables are set, except when stated. Setting the number of threads or specifying the placement does not change much for this comparison: The mic is much slower than the host!

Any hints how to improve the situation?

Sincerely,

HC

Naiive Hardware Configuration Question.

 

Yet another naiive question. If I establish 2 compute nodes in my sandbox am I generally better off with a mic and 2 gpgpu per node? I'm guessing the answer is, it depends... But assuming that the mics leverage the vector processing in the gpus then pci seems like less of a bottleneck than qdr. My googling isn't showing big boxes with Frankenstein nodes but in my empty head it seems like a good idea.

 

Thanks again Robert

 

Better than linear scaling

Hi,

I'm currently wondering about the scaling of my application with the number or cores. Basically I'm getting a 70x speedup with 56 cores compared to a single core. However the whole plot (see attached image) still looks more or less like a line but with a slope of about 1.2. I'm runing this application with thread numbers that are multiples of 4 and KMP_AFFINITY set to compact. What could possibly explain my curve?

CPU compatibility with Xenon Phi ?

I am having hard time finding information on CPU compatibility with Xenon Phi's, if there is any.

Will the Xeon Phi 31S1P and the MPSS 3.4 work with i7 4820k ? Is there any restriction on CPU ?

Also, the Read me file for Windows of the driver says that the currently supported OS are:

Microsoft Windows* 7 Enterprise SP1 (64-bit)

Microsoft Windows* 8/8.1 Enterprise (64-bit)

Microsoft Windows* Server 2008 R2 SP1 (64-bit)

Microsoft Windows* Server 2012 (64-bit)

Microsoft Windows* Server 2012 R2 (64-bit)

 

CPU compatibility with Xenon Phi ?

I am having hard time finding information on CPU compatibility with Xenon Phi's, if there is any.

Will the Xeon Phi 31S1P and the MPSS 3.4 work with i7 4820k ? Is there any restriction on CPU ?

Also, the Read me file for Windows of the driver says that the currently supported OS are:

Microsoft Windows* 7 Enterprise SP1 (64-bit)

Microsoft Windows* 8/8.1 Enterprise (64-bit)

Microsoft Windows* Server 2008 R2 SP1 (64-bit)

Microsoft Windows* Server 2012 (64-bit)

Microsoft Windows* Server 2012 R2 (64-bit)

 

Is there any way to link against an older version of MPSS

Hi Folks, 

I'm seeing some very strange performance with a computational chemistry code (CP2K) that I've previously benchmarked extensively on the Xeon Phi. I'm running in native mode for these tests. 

Since our cards were upgraded to MPSS version 3.4.2 my mixed mode MPI/OpenMP version of the code is running 10-20 times slower than it used to. 

Xeon Phi 31S1P 270W vs 300W

Hi,

System: Ubuntu 14.03, MPSS 3.4.1, 31S1P

When I run micinfo it display "Product 300W Passive CS" instead of 270W as product description. Is it a "feature" or a bug?

  Thanks,

 

System Info
        HOST OS            : Linux
        OS Version        : 3.13.0-44-generic
        Driver Version        : 3.4.2-1
        MPSS Version        : NotAvailable
        Host Physical Memory    : 264047 MB

Device No: 0, Device Name: mic0

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