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?
I found that ifort (and gfortran) create a temporary for the following array assignment:
presumably because of the possibility that inc is less than zero. The result is stored in a stride 1 temporary and then copied to the destination, all reporting vectorization.
If I write
do i= 1,n-inc,inc
I was wondering if there is a function which performs a permutation of the elements of a vector, in order to avoid the classic method consisting of defining a permutation matrix (which is filled with 1 or 0) and then calculating the product of this permutation matrix by the fixed vector.
For example, this function could probably have two vectors as input : X and P
Dear Intel developers,
Compilation of this subroutine optrms.F (See attachment) leads to an **Internal compiler error: segmentation violation signal raised** with -O3 options. This error disappears with -O2
The compilation instructions is /share/apps/intel/composer_xe_2013_sp1.2.144/bin/intel64/ifort -i8 -r8 -pc64 -auto -vec-report0 -warn nousage -cxxlib
fort version: Intel(R) Fortran Intel(R) 64 Compiler XE for applications running on Intel(R) 64, Version 22.214.171.124 Build 20140120
Linux kernel: 2.6.32-279.14.1.el6.x86_64
I have a fortran dll compiled for Win32 with v 11.something, on Win7 called by a VB6 application. The VB application, not in my scope, is compiled on XP. The two have been working fine together on XP and Win7. Just recently, the VB app generates a RTE of 53 - "file not found" on XP, but works fine on Win7. None of the compiler flags for the DLL have been changed other than switching between Debug and Release (at least not that I can remember). The target platform has been defaulted to "not set". I tried x86 as the target but no change.
Is there some resource that explains how debugging works in VS2012 when using IVF (latest version)? It seems like with every new version of VS it gets harder to use the debugger. One thing we do a lot is to set breakpoints using conditionals. But inVS2012 it appears that you can only use variables that are actually used within a subroutine to set a conditional.
For the Intel® Compiler, vectorization is the unrolling of a loop combined with the generation of packed SIMD instructions. Because the packed instructions operate on more than one data element at a time, the loop can execute more efficiently. The above message indicates that the loop was successfully vectorized using packed SIMD instructions.
My openMP thread tries to do the below:
arr(1) = arr(1) + (a(j) + b(j))
- Page 1