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Putting Your Data and Code in Order: Data and layout - Part 2

In this pair of articles on performance and memory covers basic concepts to provide guidance to developers seeking to improve software performance. This paper expands on concepts discussed in Part 1, to consider parallelism, both vectorization (single instruction multiple data SIMD) as well as shared memory parallelism (threading), and distributed memory computing.
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  • Fortran
  • Intermedio
  • Intel® Advisor
  • Intel® Cilk™ Plus
  • Intel® Threading Building Blocks
  • Intel® Advanced Vector Extensions
  • OpenMP*
  • Modernizzazione codici
  • Architettura Intel® Many Integrated Core
  • Ottimizzazione
  • Elaborazione parallela
  • Threading
  • Vettorizzazione
  • Highest valid sub-leaf index of CPUID(EAX = 0DH)

     

    I refer to the document of ISA extensions at <https://software.intel.com/sites/default/files/managed/07/b7/319433-023..... (page 2-18)

     

     

    The highest valid sub-leaf index, n, is

    (POPCNT(CPUID.(EAX=0D, ECX=0):EAX) + POPCNT(CPUID.(EAX=0D, ECX=0):EDX) - 1)

     

     

    How to obtain this formula of the highest valid sub-leaf index of CPUID.0DH?

    Build Problem - OFFLOAD MIC

    Hi,

    i am trying to compile a version of my code in which i use OFFLOAD on MIC. I am able to obtain all *.o files but when i try to link them i receive a lot of errors like this:

    x86_64-k1om-linux-ld: skipping incompatible /opt/intel/composer_xe_2015.2.164/compiler/lib/intel64/libifport.so.5 when searching for libifport.so.5

    My previous code was only MPI-OPENMP without offload. I changed only three files and compiled them using -qoflload=mandatory. I obtain *.o files without any error but then i am not able to link them. 

    L1-, L2- and L3-bandwidth of E5-2680 v3 (i.e., Haswell)

    Hi all,

    I am currently investigating the L1, L2 and L3 bandwidth of our latest Haswell
    CPU (Xeon E5-2680 v3). The L1, L2 and L3 size of this CPU is 32 KiB, 256 KiB
    and 32 MiB, respectively.

    I am using a SAXPY-like kernel (i.e., X += Y) to measure the bandwidth. Please
    find the benchmark results attached.

    Alignment problem

    Dear Intel Developers,

    I'm using Intel icc 15.0.1 version on a C program. I'm trying to align a structure of arrays and the same structure is passed to a computational kernel that uses Intrinsics. I'm not sure I'm doing the right allocations:

     

    Get the Power Consumption Info When Running a Program

    Hi,

    When I run a program using offload mode, I want to collect the information of power consumption of the MIC. Is there any way to do that?

    I found that I can use the micsmc to get the Total Power info in the command line/GUI interface.(https://software.intel.com/en-us/blogs/2014/01/31/intel-xeon-phi-coproce...) Could I add a function from any libraries inside a program to collect the power consumption when use offload mode?

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