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在英特尔® 集成众核 (英特尔® MIC) 架构上使用 OpenMP* 的最佳设计方案
下载文章下载 在英特尔® 集成众核 (英特尔® MIC) 架构上使用 OpenMP* 的最佳设计方案 [PDF 401KB]摘要本文是对“面向 Linux* 的英特尔® Composer XE”文档的补充。 本文对在为英特尔集成众核 (Intel MIC) 架构编写卸载和本地程序时使用 C/C++ 和 Fortran 的 OpenMP* 扩展的最佳方法进行了概括。概述最佳设计方案 (BKM)...
View Article面向英特尔® 至强融核™ 协处理器(和英特尔® 至强® 处理器)架构应用的浮点计算 R2R 再现性
问题如果在相同处理器上针对相同输入数据重新运行相同的程序，得到的结果相同吗？串行代码串行代码浮点运算结果的差异的唯一已知来源是由外部环境更改引发的数据调整。 例如，用户动态分配了一个包含日期的新字符串。 该字符串的大小随一年中的月份或周的日期而不同，因此需要对分配的日期进行后续调整。 调整范围决定着哪些循环迭代是循环开头或循环结尾(remainder...
View ArticleQERFC may return incorrect results if floating-point exceptions are unmasked
Reference Number : dpd200178477Version : Intel® Fortran Compiler Versions 12, 13 and 14.Operating System : Windows*, Linux*, OS X*Problem Description : For certain values of the argument, the result of...
View ArticleDiagnostic 15043: loop was not vectorized: nonstandard loop is not a...
Causes:1. More than one exit point in the loop. A loop must have a single entry and a single exit point. Multiple exit points in a loop can cause this message. 2. An iteration count that is data...
View ArticleDiagnostic 15046: loop was not vectorized: existence of vector dependence...
Cause: The compiler has detected a potential backward dependency between loop iterations that could make vectorization unsafe. The compiler will not auto-vectorize a loop if there are any data values...
View ArticleDiagnostic 15037: loop was not vectorized: vectorization possible but seems...
This diagnostic can also occur in the form: remainder loop was not vectorized: vectorization possible but seems inefficientCause:The compiler only auto-vectorizes a loop if its internal heuristics...
View ArticleDiagnostic 15032: loop was not vectorized: unsupported reduction (Fortran)
Cause:Reduction idioms can be recognized by the compiler and vectorized in simple cases.The compiler is unable to vectorize more complex constructs and emits a warning message:Example: integer function...
View ArticleDiagnostic 15033: loop was not vectorized: modifying order of operation not...
Cause:A summation operation or reduction can be vectorized by breaking it up into a separate partial sum for each vector lane, and then adding together the partial sums at the end. Because this changes...
View ArticleDiagnostic 15011: loop was not vectorized: statement cannot be vectorized...
Cause:The loop contains a statement that cannot be mapped to SIMD instructions by the vectorizer. In the example below, the loop contains an assignment to a derived data type which is not directly...
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Doctor Fortran in "It's a Modern Fortran World"
I recently received a copy of "Numerical Computing with Modern Fortran", by Richard Hanson and Tim Hopkins, and noted how many books on Fortran are being published recently with "Modern Fortran" in the...
View ArticleDiagnostic 15033: loop was not vectorized: modifying order of operation not...
Cause:A summation operation or reduction can be vectorized by breaking it up into a separate partial sum for each vector lane, and then adding together the partial sums at the end. Because this changes...
View ArticleDiagnostic 15015: loop was not vectorized: unsupported data type (Fortran)
Cause:The vectorizer does not support certain data types because there is no corresponding SIMD instruction. For example, the compiler supports REAL(16) arithmetic (quad precision) through a software...
View ArticleStatic linking with -mkl, -ipp or -tbb may give unresolved references
Reference Number : dpd200252274Version : Intel® C++ Compiler and Intel® Fortran Compiler versions 13.0.1, 13.1.any, 14.0.0 and 14.0.1Operating System : Linux*, OS X*Problem Description : When an...
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Upgrade Your Fortran Compiler
Still using an old version of Intel® Fortran Compiler or Intel® MKL? You're probably leaving performance on the table. You have an opportunity to increase your application's performance by taking...
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Help understanding linker error "Unresolved external"
I am developing a project that includes a module XYGraph and subroutine XYPlot, which I compile for redistribution to other programmers working in my group. The object files XYGraph.obj and XYPlot.obj...
View Articlefortran invoking fortran dll LNK2019 problem on win7 64bit, decorate does not...
The code: !foo.for #define DLLIMPORT(name) _EXCLAMATIONDEC attributes dllimport,alias:#name::name #define DLLEXPORT(name) _EXCLAMATIONDEC attributes dllexport,DECORATE,alias:#name::name subroutine...
View ArticleSubroutine to solve system of equation with the accuracy better than double...
I'm currently using the GESV subroutine from MKL library to solve the system of equations (A.x=B). The number I used is Double Precision.I see the results are accurate up to 11 digits after the...
View Articlefortran and c mixing
hello I created a c static library with this code:fileopen.h:extern FILE *fp;r.h:#ifdef HAVE_F77_UNDERSCORE # define F77_CALL(x) x ## _ #else # define F77_CALL(x) x #endif #define F77_NAME(x)...
View ArticleLAPACK integration
I'm working to integrate LAPACK and BLAS libraries with a Fortran project in Visual Studio, and I can't seem to get things to work. I have downloaded liblapack.lib and libblas.lib and included their...
View ArticlePassing arrays in subroutines
Hello! I am interesting, in wich cases the compiler will force to allocate any of used array from the memory Case 1: subroutine VolFracToMassFrac(VolFrac, MassFrac) real, intent(in) :: VolFrac(:)...
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