[英]LAPACK/LAPACKE with C++ on LINUX — Compiling, Linking and Running?
Intro: I've developed an application in C++ that utilizes LAPACK(LAPACKE) and MPI, all on Windows. 简介:我开发了一个使用LAPACK(LAPACKE)和MPI的C ++应用程序,所有这些都在Windows上。 Works OK in Windows (compiling and linking are taken care of through Code::Blocks IDE), but the execution is way too slow. 在Windows中正常工作(编译和链接通过Code :: Blocks IDE处理),但执行速度太慢。 Hence, I want to migrate the code to our small "supercomputer" running under CentOS Linux where we have already installed GNU C++, MPICH2 and LAPACK. 因此,我想将代码迁移到运行在CentOS Linux下的小型“超级计算机”,我们已经安装了GNU C ++,MPICH2和LAPACK。
Questions: How to COMPILE/LINK and RUN a C++ code that calls LAPACKE on Linux/CentOS? 问题:如何在Linux / CentOS上调用/链接和运行调用LAPACKE的C ++代码? Do I have to have GNU Fortran installed on the CentOS machine in order to compile/link/run C++ with LAPACK(LAPACKE)? 我是否必须在CentOS机器上安装GNU Fortran才能使用LAPACK(LAPACKE)编译/链接/运行C ++?
THANKS A LOT!!! 非常感谢!!!
I assume that my Debian is close enough to your CentOS for these tricks to work... 我假设我的Debian足够接近你的CentOS,这些技巧可以运作......
1) Check that LAPACKE is installed on your computed. 1)检查计算机上是否安装了LAPACKE。
/usr/include
, /usr/local/include
for files lapacke.h
, lapacke_config.h
, lapacke_mangling.h
, lapacke_mangling_with_flags.h
and lapacke_utils.h
. 您可以搜索/usr/include
, /usr/local/include
等文件lapacke.h
, lapacke_config.h
, lapacke_mangling.h
, lapacke_mangling_with_flags.h
和lapacke_utils.h
。 /usr/lib
or /usr/local/lib
for the static library lapacke.a
or the dynamic library lapacke.so
or lapacke.so.3
. 您可以在/usr/lib
或/usr/local/lib
类的位置搜索静态库lapacke.a
或动态库lapacke.so
或lapacke.so.3
。 If these files are missing, consider installing the packages liblapacke
and liblapacke-dev
. 如果缺少这些文件,请考虑安装liblapacke
和liblapacke-dev
软件包。 Alternatively, (in particular if you don't have root privileges), you can download source of netlib's lapack and lapacke at http://www.netlib.org/lapack/#_lapack_version_3_6_1 To compile LAPACKE, rename make.inc.example
to make.inc
, then type: 或者,(特别是如果你没有root权限),你可以在http://www.netlib.org/lapack/#_lapack_version_3_6_1下载netlib的lapack和lapacke的源代码来编译LAPACKE,重命名make.inc.example
到make.inc
,然后输入:
make
make lapackelib
The include files will be located in lapack-3.6.1/LAPACKE/include
and the library will be in lapack-3.6.1
. 包含文件将位于lapack-3.6.1/LAPACKE/include
,库将位于lapack-3.6.1
。 gcc
and gfortran
are useful to recompile lapack and lapacke from scratch. gcc
和gfortran
可以从头开始重新编译lapack和lapacke。
2) Let's compile a simple code based on this example : 2)让我们根据这个例子编译一个简单的代码:
#include <iostream>
#include <string>
#include <fstream>
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <lapacke.h>
#include "mpi.h"
void print_matrix_rowmajor(const char* desc, lapack_int m, lapack_int n, double* a, lapack_int lda );
int main(int argc, char *argv[])
{
MPI_Init(&argc,&argv);
std::cout << "Start..." << std::endl;
//std::string fn_VALS;
/* Locals */
double A[5][3] = {1,1,1,2,3,4,3,5,2,4,2,5,5,4,3};
double b[5][2] = {-10,-3,12,14,14,12,16,16,18,16};
lapack_int info,m,n,lda,ldb,nrhs;
/* Initialization */
m = 5;
n = 3;
nrhs = 2;
lda = 3;
ldb = 2;
/* Print Entry Matrix */
print_matrix_rowmajor( "Entry Matrix A", m, n, *A, lda );
/* Print Right Rand Side */
print_matrix_rowmajor( "Right Hand Side b", n, nrhs, *b, ldb );
printf( "\n" );
/* Executable statements */
printf( "LAPACKE_dgels (row-major, high-level) Example Program Results\n" );
/* Solve least squares problem*/
info = LAPACKE_dgels(LAPACK_ROW_MAJOR,'N',m,n,nrhs,*A,lda,*b,ldb);
/* Print Solution */
print_matrix_rowmajor( "Solution", n, nrhs, *b, ldb );
printf( "\n" );
std::cout << "info = " << info << std::endl;
std::cout << "Done :-) !!!" <<std::endl;
MPI_Finalize();
return 0;
}
////////////////////////////////////////////////////////* Auxiliary routine: printing a matrix */
void print_matrix_rowmajor(const char* desc, lapack_int m, lapack_int n, double* a, lapack_int lda )
{
lapack_int i, j;
printf( "\n %s\n", desc );
for( i = 0; i < m; i++ )
{
for( j = 0; j < n; j++ )
{
printf( " %6.2f", a[i*lda+j]);
}
printf( "\n" );
}
}
//=======================================
The command to compile is: 编译命令是:
mpiCC main.cpp -o main -llapacke -llapack -lblas -lm -Wall
If the include files are in a particular folder, use -I/usr/pathtolapackedoth
. 如果包含文件位于特定文件夹中,请使用-I/usr/pathtolapackedoth
。 Similarly, if the library is in a particula folder, try -L/usr/lib/pathtoliblapackedota
. 同样,如果库位于particula文件夹中,请尝试-L/usr/lib/pathtoliblapackedota
。 Depending on how MPICH2 was installed, it is likely that mpiCC
wraps g++. 根据MPICH2的安装方式, mpiCC
很可能包含g ++。 You can type mpiCC --version
to learn more. 您可以输入mpiCC --version
来了解更多信息。 To run it using 2 processes: 要使用2个进程运行它:
mpirun -np 2 main
Finally, you do not have to install GNU Fortran installed on the CentOS machine in order to compile/link/run C++ with LAPACK(LAPACKE). 最后,您不必在CentOS机器上安装GNU Fortran,以便使用LAPACK(LAPACKE)编译/链接/运行C ++。 Indeed, it is only required if you wish to recompile LAPACK from scratch. 实际上,只有在您希望从头开始重新编译LAPACK时才需要它。
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