Matlab多线程 [英] Multithreading with Matlab

问题描述

我正在Matlab上的一个项目中，我们必须优化性能，并且我正在考虑并行化由.m文件进行的几个函数调用.

I'm working on a project on Matlab where we have to optimize the performance, and I was thinking about parallelizing a couple of function calls that were made from a .m file.

这个想法很简单，从Matlab文件(.m)调用编译为MEX的C文件，然后从该C文件创建几个线程，并从每个线程中调用matlab函数.

The idea was simple, from a Matlab file (.m) call a C file compiled as MEX, and from that C file, create a couple of threads and call back the matlab functions from each thread.

理论可行，我可以创建线程，也可以调用matlab函数，问题是我无法从线程调用matlab函数:

The theory works, I can create the threads, and I can also call the matlab function, the problem is that I cannot call the matlab function from the thread:

//Global variables
mxArray **g_plhs;
mxArray **g_prhs;
int g_nlhs;
int g_nrhs;

//Thread function
DWORD WINAPI my_function( LPVOID lpParam ) 
{
    mexCallMATLAB(g_nlhs,g_plhs,g_nrhs,g_prhs,"matlab_function");
    return 0; 
}


//Main function
void mexFunction(int nlhs, mxArray *plhs[],
    int nrhs, const mxArray *prhs[]) {

    DWORD dwThreadIdArray[MAX_THREADS];
    HANDLE  hThreadArray[MAX_THREADS]; 
    g_plhs = plhs;
    g_prhs = prhs;
    g_nlhs = nlhs;
    g_nrhs = nrhs;

    hThreadArray[0] = CreateThread( 
        NULL,                   
        0,                      
        my_function,            
        NULL,                   
        0,                      
        &dwThreadIdArray[0]);   

    WaitForMultipleObjects(MAX_THREADS, hThreadArray, TRUE, INFINITE);

    for(i=0; i<MAX_THREADS; i++)
    {
        CloseHandle(hThreadArray[i]);
    }
}

使用matlab时，我们对该选项有任何限制吗? 有人尝试过这样的事情吗?

Do we have any restriction on that option when working with matlab? Has somebody tried something like this?

是否有不需要Parallel Toolbox的选项?

Is there any option that doesn't require Parallel Toolbox?

推荐答案

您只能从MATLAB主线程调用mx *和mex *函数.您可以编写多线程MEX文件，只要这些文件能在mx界面以下的水平上发挥作用.如果需要多个MATLAB解释器，则需要多个MATLAB进程.一种方法是通过@You指出的并行计算工具箱".这使您可以同时运行PARFOR循环和SPMD块.

You can only call the mx* and mex* functions from the MATLAB main thread. You can write multithreaded MEX files providing these do their work at a level below the mx interface. If you want multiple MATLAB interpreters, you need multiple MATLAB processes. One way is through the Parallel Computing Toolbox as pointed out by @You. This gives you PARFOR loops and SPMD blocks for running things simultaneously.

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