在典型的 Fortran 程序中使用 macports 中的 ATLAS/Lapack
我正在尝试用 mpi 和 fortran 编写一个简单的微分方程求解器。我想我也可以熟悉使用 ATLAS/LAPACK/BLAS 例程，因为它们似乎对我将来可能做的任何数值建模都非常有用。我通过 macports 安装了 ATLAS。我使用 gcc 4.4（也通过 macports 安装。）
我主要是自学的，从来没有故意使用过 ATLAS、BLAS、LAPACK 或任何“库”（我在 C++ Java 和 Perl 中使用过“include”语句或它们的等价物） -但没有完全理解它们是如何工作的。）
我只是希望能够使用 ATLAS 编写一段代码来解决 Fortran 中的 Ax=b 问题。我已经查找了示例代码，但它似乎需要“pgi”。经过多次谷歌搜索后，我仍然不知道“pgi”是什么或者它有什么作用。在终端中输入“add pgi”只是告诉我 “添加：未找到命令”
我使用 mac 10.5.8 以防有任何直接相关。
我希望这是一个合理的地方来提出这个问题。
I am trying to write a simple differental equation solver in mpi and fortran. I figured I may as well get familiar with using ATLAS/LAPACK/BLAS routines as they seem quite useful for any future numerical modeling I might do. I installed ATLAS via macports. I use gcc 4.4 (also installed via macports.)
I am mostly self taught, and have never used ATLAS, BLAS, LAPACK, or any "library" knowingly (I have used "include" statements or their equivalents in C++ Java and Perl--but without full understanding of how they work.)
I would just like to be able to write a code that solves Ax=b in fortran using ATLAS. I have looked for sample code, but it seems to require "pgi." After much googling I still have no idea what "pgi" is or what it does. Typing "add pgi" in terminal just told me that
"add: command not found"
I use a mac 10.5.8 in case that is of any direct relevance.
I hope this is a reasonable place to ask this question.
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一方面：链接时必须确保包含库。这可以通过带有“-l”选项的编译命令来命名库来完成。如果库位于不寻常的目录中，您可能还需要“-L”选项来告诉链接器在哪里可以找到它。如果您使用 macports gfortran 和 macports 安装库，您可能不需要“-L”选项。 Macports 库将位于 /opt/local/lib 中，因此如果您需要选项：“-L/opt/local/lib”。当您使用“-l”选项指定库的名称时，约定是保留“lib”和文件类型，即“-latlas”。
对于某些库，您可能需要在 Fortran 源代码中使用“use”语句。
作为并行编程的初学者，您可能会发现 OpenMP 比 MPI 更容易。我建议分阶段尝试——首先让顺序程序工作，然后考虑并行编程。
http://people 上有一些使用 lapack 的示例。 sc.fsu.edu/~jburkardt/f_src/lapack/lapack.html。 John Burkardt 可能还有其他可供您使用的示例。
One aspect: have to be sure to include the libraries when you link. This can be done with the compile command with the "-l" option to name the library. If the library is in an unusual directory you may also need the "-L" option to tell the linker where to find it. If you are using the macports gfortran and macports installed libraries, you will probably not need the "-L" option. Macports libraries will be in /opt/local/lib, so if you need the option: "-L/opt/local/lib". When you specify the name of the library with the "-l" option, the convention is that you leave of "lib" and the filetype, so "-latlas".
You may need a "use" statement in your Fortran source code for some libraries.
As a beginner at parallel programming, you will probably find OpenMP easier than MPI. I suggest trying things in stages -- get your sequential program working first, then think about parallel programming.
There are some examples of the use of lapack at http://people.sc.fsu.edu/~jburkardt/f_src/lapack/lapack.html. John Burkardt may have other examples of use to you.