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FAQS: Compilers, Libraries, Performance, Profiling and Optimization.

In the period prior to the launch of Intel® Xeon Phi™ coprocessor, Intel collected questions from developers who had been involved in pilot testing. This document contains some of the most common questions asked. Additional information and Best-Known-Methods for the Intel Xeon Phi coprocessor can be found here.

The Intel® Compiler reference guides can be found at:

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?

dell R7610 issue & offload options on windows 7 X64




i have installed xeon phi dev env on windows 7 enterpise X64 on a dell R7610

first (I):

i have installed MPSS3.2.1

sometimes after PC starts  the xeon phi is not seen in the windows device manager

after desintall / reinstall MPSS  => it 's ok the xeon phi is seen


second (II)

i try to make a personal benchmark using  CAO  offload mode.  (FFT with MKL and FFTW3 )

i generate a 64 bits exe  with visual studio and intel c++ 14.0

but in the execution i got an :

icl -nologo -Qmic (suppressing banner logo with mic compiler)

I can't seem to properly suppress the banner logo when running icl with the /Qmic option under Windows....

> icl  -Qmic  test.cpp

Intel(R) C++ Intel(R) 64 Compiler XE for applications running on Intel(R) 64, Version Build 20140130

Copyright (C) 1985-2014 Intel Corporation.  All rights reserved.

> icl -nologo -Qmic  test.cpp

icc: command line warning #10006: ignoring unknown option '-nologo'

How to hybrid MIC and CPU without copy-and-paste


I know I can hybrid MIC and CPU by using synchronized offload directive.

But I have one question. How to do that without copying and paste codes

For example, there is a vector addition

#pragma omp prallel for
for(i=0;i<N;i++) C[i] = A[i] + B[i];

I can hybrid it like:

#pragma offload inout(C[0:N/2]: alloc(C[0:N/2])) signal(&sig)
#pragma omp parallel for
for(i=0;i<N/2;i++) C[i] = A[i] + B[i];

#pragma omp parallel for
for(i=N/2;i<N;i++) C[i] = A[i] + B[i];

#pragma offload wait(&sig)


Offload compilation problem with -openmp option.

Hi all!

I have problems using openmp and offload directives. The following (reduced) code give right result (1  2  3  4  5  0  0  0  0  0), when it's compiled without openmp ("ifort test.f -o test"), and wrong (1  2  3  4  5  6  7  8  9 10) with openmp ("ifort -openmp test.f -o test").


Optimierung abonnieren