Question

我正在尝试通过rpc协议获取NFS磁盘配额。通过使用OpenMP，我创建并行udp连接。该程序在1和2核心运行时没有任何错误。当我将核心数增加到4时，经过一段时间的程序在“clntudp_create（）”函数中给出“RPC：端口映射器故障 - RPC：无法发送”错误，这就是创建udp连接。我正在使用以下代码来完成这项工作。

/*
     * 0 -> True
     * 1 -> Couldn't resolve hostname
     * 2 -> Udp connection couldn't initiate
     * 3 -> Query couldn't run 
     * 4 -> Unknown error
     */
    long long int diskOfUser::getNfsQuota(string blockDevice, int uid)
    {
        //some address resolving operations
        int whereToSplit = blockDevice.find(':');
        if(whereToSplit == std::string::npos)  
            return 5;
        std::string host = blockDevice.substr(0, whereToSplit);  
        std::string path = blockDevice.substr(whereToSplit+1, blockDevice.size() - whereToSplit);
        char *pathToGo = new char[path.size()+1];
        strcpy(pathToGo,path.c_str());
        char *hostToGo = new char[host.size()+1];
        strcpy(hostToGo,host.c_str());

        //variable definitions
        struct getquota_args *gqArgs;               
        gqArgs = new struct getquota_args;
        struct getquota_rslt *gqRslt;               //quota result object
        gqRslt = new struct getquota_rslt;
        struct sockaddr_in server_addr;             //udp connection address
        struct hostent *hp;                 
        struct timeval timeout, totTimeOut;         //timeout values
        CLIENT *client = NULL;                      //udp client
        int socket = RPC_ANYSOCK;
        timeout.tv_usec = 0;
        timeout.tv_sec = 6;
        totTimeOut.tv_sec = 25;
        totTimeOut.tv_usec = 0;
        //try to resolve host
        if ((hp = gethostbyname(hostToGo)) == NULL)
        {
            delete pathToGo;
            delete hostToGo;
            return 1;                   //hostname couldn't resolve
        }


        /* Try to start UDP connection (Problematic part)*/
        server_addr.sin_family = AF_INET;
        server_addr.sin_port =  htons(875);
        memcpy(&server_addr.sin_addr, hp->h_addr, hp->h_length);
        server_addr.sin_port =  0;
        if ((client = clntudp_create(&server_addr, (u_long)100011, (u_long)1, timeout, &socket)) == NULL)
        {
            delete pathToGo;
            delete hostToGo;
            clnt_pcreateerror("error"); // gives the following error "RPC: Port mapper failure - RPC: Unable to send"
            return 2;                   //udp connection could not start
        }

        /* UDP connection created */
        //quota asking operations ...

    }

有没有办法让这个工作线程安全？

编辑：“RPC：无法发送; errno =错误的文件描述符”clnt_sperror（）函数发出此错误。我分别用一个核心启动四个进程，程序运行没有错误。但是4个核心的1个进程总是在爆炸。

解答：

/* UDP connection oluşturuluyor */
        if ((client = clnt_create(hostToGo, (u_long)100011, (u_long)1, "UDP")) == NULL)
        {
                delete pathToGo;
                delete hostToGo;
                return 2;                                       //rquotad ile udp connection oluşturma işlemi başarısız oldu
        }
        /* UDP connection oluşturuldu */
        client->cl_auth = authunix_create_default();            //rpc authentication handle
        gqArgs->gqa_uid = uid;                                  //argumanlar set ediliyor
        gqArgs->gqa_pathp = pathToGo;

我用clnt_create（）函数达到目标。它是clntudp_create（）的线程安全替代品。但是，在服务器端rquota.d将所有请求分开并逐个回答。因此，它没有完全优化。

RPC：端口映射器故障 - RPC：无法在OpenMp多线程应用程序上发送

0 个答案: