Intel® C++ Composer XE

Оптимизировали, оптимизировали, да не выоптимизировали!

Оптимизация? Конечно, каждый сталкивался с данной задачей при разработке своих, сколь-нибудь значительных, требующих определённых вычислений, приложений. При этом способов оптимизировать код существует огромное множество, и, как следствие, различных путей сделать это в автоматическом режиме с помощью опций компилятора. Вот здесь и возникает проблема – как выбрать то, что нужно нам и не запутаться?

Memory Movement and Initialization: Optimization and Control

Compiler Methodology for Intel® Many Integrated Core (Intel® MIC) Architecture

 

Overview


Are you initializing data or copying blocks of data from one variable to another in your application?  Probably so.  Moving or setting blocks of data is very common.  So how to best optimize these operations for Intel® Xeon Phi™ Coprocessors? 

  • Sviluppatori
  • Linux*
  • C/C++
  • Fortran
  • Avanzato
  • Intermedio
  • Intel® C++ Composer XE
  • Intel® Fortran Composer XE
  • intel_fast_memcpy
  • intel_fast_memset
  • VECTOR TEMPORAL
  • -opt-streaming-stores
  • Strumenti di sviluppo
  • Open Source Downloads

    This article makes available third-party libraries, executables and sources that were used in the creation of Intel® Software Development Products or are required for operation of those. Intel provides this software pursuant to their applicable licenses. [Intel® Graphics Technology, Intel® Composer XE, Intel® C++ Composer XE, Intel® Application Debugger, Intel® Many Integrated Core Architecture Debugger & Intel® JTAG Debugger]
  • Sviluppatori Intel AppUp®
  • Linux*
  • Microsoft Windows* (XP, Vista, 7)
  • Microsoft Windows* 8
  • C/C++
  • Fortran
  • Compilatore C++ Intel®
  • Intel® C++ Composer XE
  • Intel® Composer XE
  • Compilatore Fortran Intel®
  • Debugger
  • Debugger Intel®
  • Debugger Intel® JTAG
  • Eclipse
  • EPL
  • third-party
  • Intel(R) Software Development Products
  • Intel® Graphics Technology
  • Intel® Composer XE
  • Intel® C++ Composer XE
  • Intel® Application Debugger
  • Intel® Many Integrated Core Architecture Debugger & Intel® JTAG Debugger
  • Grafica
  • Processori Intel® Atom™
  • Open source
  • Question on reducers

    In my search application there are globally variables defined outside any function that I would like to use the cilk reducers on.

    Specifically I have code like this:

    #include "search.h"
    
    static int total_users = 0;
    static int total_matches = 0;

    These total_x variables are incremented throughout the application on different functions.

    I tried adding the following for total_users and received the following error:

    How to use the cilkview?

    I have a C search application  on a centos 6.x 64 bit linux server that I just installed the cilkplus compiler on to take advantage of more cpu/cores. I've added the cilk_spawn function to some recursive scanning functions in my program.  After re-compiling the search application with the cilkplus gcc compiler, the search program is working as intended without any seg faults or any other errors.

    My question is how do I use the cilkview analyzer? I want to if cilkplus/spawning is helping my search application and if so by how much?

    Thanks!

    Lawrence

     

     

    The Chronicles of Phi - part 4 - Hyper-Thread Phalanx – tiled_HT2

    The prior part (3) of this blog showed the effects of the first-level implementation of the Hyper-Thread Phalanx. The change in programming yielded 9.7% improvement in performance for the small model, and little to no improvement in the large model. This left part 3 of this blog with the questions:

    What is non-optimal about this strategy?
    And: What can be improved?

    There are two things, one is obvious, and the other is not so obvious.

    Data alignment

    Iscriversi a Intel® C++ Composer XE