Tilera多线程网络编程总结

http://blog.csdn.net/zwleagle/article/details/8851400

http://blog.sina.com.cn/s/blog_a574f78401015v2o.html

http://www.dssz.com/1341360.html

http://www.dssz.com/1341355.html

多线程网络处理服务器demo

 #include <stdio.h>
 #include <stdlib.h>
 #include <errno.h>
 #include <string.h>
 #include <sys/types.h>
 #include <netinet/in.h>
 #include <sys/socket.h>
 #include <sys/wait.h>
 #include <unistd.h>
 #include <arpa/inet.h>
 //#include <openssl/ssl.h>
 //#include <openssl/err.h>
 #include <fcntl.h>
 #include <sys/epoll.h>
 #include <sys/time.h>
 #include <sys/resource.h>
 #include <pthread.h>
 #include <assert.h>

 //#define DEBUG_TILERA


 #ifdef DEBUG_TILERA
 #include <tmc/alloc.h>

 #include <arch/cycle.h>
 #include <arch/spr.h>

 #include <tmc/cpus.h>
 #include <tmc/sync.h>
 #include <tmc/task.h>
 #endif

 /* These are non-NULL pointers that will result in page faults
 * under normal circumstances, used to verify that nobody uses
 * non-initialized list entries.
 */


 #define MAXBUF 1024
 #define MAXEPOLLSIZE 500000

 #define MAX_THREAD_NUMBER 200
 int  THREAD_NUMBER = 50;


 int kdpfd;
 struct epoll_event events[MAXEPOLLSIZE];

 struct epoll_event thread_events[MAX_THREAD_NUMBER][MAXEPOLLSIZE];
 int fdpool[MAX_THREAD_NUMBER] = {-1};

 pthread_t  handle_receive_thrdid[MAX_THREAD_NUMBER];


 int msgcount = 0;
 int timecount = 0;

 int count_packet= 0;

 pthread_mutex_t connet_count_lock = PTHREAD_MUTEX_INITIALIZER;
 int connect_count = 0;

 pthread_mutex_t curfds_lock;
 int curfds;

 char buffer[MAX_THREAD_NUMBER][MAXBUF + 1];
 pthread_t thread_count;


 cpu_set_t cpus;



 void BubbleSort(unsigned char R[],int n)
 {
     int i,j;
     unsigned char temp;
     for (i=0; i<n-1; i++ )
     {
         for (j=n-2; j>=i; j--)
         {
             if (R[j]>R[j+1])
             {
                 temp=R[j];
                 R[j]=R[j+1];
                 R[j+1]=temp;
             }
         }
     }
 }

 /*
 setnonblocking - 设置句柄为非阻塞方式
 */
 int setnonblocking(int sockfd)
 {
     if (fcntl(sockfd, F_SETFL, fcntl(sockfd, F_GETFD, 0)|O_NONBLOCK) == -1)
     {
         return -1;
     }
     return 0;
 }

 /*
 handle_message - 处理每个 socket 上的消息收发
 */



 static void *handle_count(void* arg)
 {
     int precount, speed;

     while(1)
     {
         precount = msgcount;
         sleep(5);
         timecount += 5;
         //printf("The tcp connection count is %d\n",count_tcp);
         //printf("The received packets count is %d, time %d\n",msgcount, timecount);
         speed = msgcount - precount ;
         printf("The received speed  is %d/5seconds, connect %d, tatol packets %d\n",speed, connect_count, msgcount);
     }

     return NULL;
 }

 static void * handl_receive_msg(void * arg)
 {
     int fdind = 0;
     int nfds = 0;
     int len;
     struct epoll_event ev;
     int fdi;

     char* buf ;

     fdind = (int)arg;

     buf = (char*)&buffer[fdind];

     // printf("fd... %d \n", fdind);

     while(1)
     {
         nfds = epoll_wait(fdpool[fdind], &thread_events[fdind][0], MAXEPOLLSIZE, -1);
         if (nfds == -1)
         {
             perror("epoll_wait");
             break;
         }

         for( fdi = 0; fdi < nfds; fdi++)
         {
             if((thread_events[fdind][fdi].events & EPOLLIN)
                /*&&(!(thread_events[fdind][fdi].events & EPOLLRDHUP))*/)
             {
                 while((-1 != (len = recv(thread_events[fdind][fdi].data.fd, buf, MAXBUF, 0)))
                       ||((-1 == len) && (EAGAIN != errno)))
                 {
                     //perror("recv error ");
                     //printf("recv error %d  fd %d\n", errno, thread_events[fdind][fdi].data.fd);
                     //goto next;


                     if (len > 0)
                     {

                         /*printf
                         ("%d receive message success   total %d bytes data  msgcount %d\n",
                          new_fd,   len, msgcount);*/
                         msgcount++;
                         BubbleSort(buf ,len);
                     }
                     else if(len == 0)
                     {
                         //printf("the socket %d is closed \n", new_fd);
                         epoll_ctl(fdpool[fdind], EPOLL_CTL_DEL, thread_events[fdind][fdi].data.fd,&ev);
                         close(thread_events[fdind][fdi].data.fd);
                         pthread_mutex_lock(&connet_count_lock);
                         connect_count--;
                         pthread_mutex_unlock (&connet_count_lock);

                         break;
                     }
                     else
                     {

                         printf(" socket %d receive message fail error code: %d,  error message: '%s'\n",
                                thread_events[fdind][fdi].events, errno, strerror(errno));


                         epoll_ctl(fdpool[fdind], EPOLL_CTL_DEL, thread_events[fdind][fdi].data.fd,&ev);
                         close(thread_events[fdind][fdi].data.fd);
                         pthread_mutex_lock(&connet_count_lock);
                         connect_count--;
                         pthread_mutex_unlock (&connet_count_lock);


                         //pthread_mutex_lock (&(curfds_lock));
                         //curfds--;
                         //pthread_mutex_unlock (&(curfds_lock));
                         break;
                     }

                 }
             }
             /* else if((thread_events[fdind][fdi].events & EPOLLRDHUP))
              {
                  epoll_ctl(fdpool[fdind], EPOLL_CTL_DEL, thread_events[fdind][fdi].data.fd,&ev);
                  close(thread_events[fdind][fdi].data.fd);
                  pthread_mutex_lock(&connet_count_lock);
                  connect_count--;
                  pthread_mutex_unlock (&connet_count_lock);

                  printf("event.... %x \n", thread_events[fdind][fdi].events);

              }*/
             else
             {
                 printf("other event %u\n",thread_events[fdind][fdi].events );
             }


         }
     }

     return NULL;

 }



 int fd_index = 0;

 int main(int argc, char **argv)
 {
     int listener, new_fd,  nfds, n, ret;
     socklen_t len;
     struct sockaddr_in my_addr, their_addr;
     unsigned int myport, lisnum;
     struct epoll_event ev;
     struct rlimit rt;
     int    fdind;
     int   ind ;

     if(5 != argc)
     {

         printf("Usage: %s <thread_number(0 ~ 200)> <port(0-65535)> <listen queue number>  <IP Address>   \n", argv[0]);
         exit(1);

     }

     if(argv[1])
         THREAD_NUMBER = atoi(argv[1]);

     if (argv[2])
         myport = atoi(argv[2]);
     else
         myport = 7838;

     if (argv[3])
         lisnum = atoi(argv[3]);
     else
         lisnum = 2;



 #ifdef DEBUG_TILERA
     if (tmc_cpus_get_my_affinity(&cpus) != 0)
     {
         printf("tmc_cpus_get_my_affinity() failed.\n");
         tmc_task_die("tmc_cpus_get_my_affinity() failed.");
     }
     if (tmc_cpus_count(&cpus) < MAX_THREAD)
     {
         printf("\nInsufficient cpus available.\n");
         tmc_task_die("Insufficient cpus available.");
     }
 #endif


     pthread_mutex_init (&connet_count_lock, NULL);
     pthread_mutex_init (&(curfds_lock), NULL);

     for( ind = 0; ind < THREAD_NUMBER; ind++ )
     {

         fdpool[ind] = epoll_create(MAXEPOLLSIZE);

     }

     for( ind = 0; ind < THREAD_NUMBER; ind++)
     {
         pthread_create(&handle_receive_thrdid[ind], NULL, &handl_receive_msg, (void*)ind);
     }

     if (pthread_create(&thread_count, NULL, &handle_count, NULL) != 0)
     {
 #ifdef DEBUG_TILERA
         tmc_task_die("pthread_create() failed.");
 #endif
     }

     /* 设置每个进程允许打开的最大文件数 */
     rt.rlim_max = rt.rlim_cur = MAXEPOLLSIZE;
     if (setrlimit(RLIMIT_NOFILE, &rt) == -1)
     {
         perror("setrlimit");
         exit(1);
     }
     else printf("set the system resource success!\n");

     /* 开启 socket 监听 */
     if ((listener = socket(PF_INET, SOCK_STREAM, 0)) == -1)
     {
         perror("socket");
         exit(1);
     }
     else
         printf("socket create success!n");

     setnonblocking(listener);

     bzero(&my_addr, sizeof(my_addr));
     my_addr.sin_family = PF_INET;
     my_addr.sin_port = htons(myport);
     if (argv[4])
         my_addr.sin_addr.s_addr = inet_addr(argv[4]);
     else
         my_addr.sin_addr.s_addr = INADDR_ANY;

     if (bind
         (listener, (struct sockaddr *) &my_addr, sizeof(struct sockaddr))
         == -1)
     {
         perror("bind");
         exit(1);
     }
     else
         printf("IP address and port bing success!\n");

     if (listen(listener, lisnum) == -1)
     {
         perror("listen");
         exit(1);
     }
     else
         printf("start to work!\n");





     /* 创建 epoll 句柄，把监听 socket 加入到 epoll 集合里 */
     kdpfd = epoll_create(MAXEPOLLSIZE);
     len = sizeof(struct sockaddr_in);
     ev.events = EPOLLIN;
     ev.data.fd = listener;
     if (epoll_ctl(kdpfd, EPOLL_CTL_ADD, listener, &ev) < 0)
     {
         fprintf(stderr, "epoll set insertion error: fd=%d\n", listener);
         return -1;
     }
     else
         printf("listen socket add to epoll success\n");




     curfds = 1;
     while (1)
     {
         /* 等待有事件发生 */
         nfds = epoll_wait(kdpfd, events, MAXEPOLLSIZE, -1);
         if (nfds == -1)
         {
             perror("epoll_wait");
             break;
         }
         /* 处理所有事件 */
         for (n = 0; n < nfds; ++n)
         {
             // printf("The number of fd %d \n", nfds);
             if (events[n].data.fd == listener)
             {
                 new_fd = accept(listener, (struct sockaddr *) &their_addr,
                                 &len);
                 if (new_fd < 0)
                 {
                     perror("accept");
                     continue;
                 }
                 //else
                 // printf("connect from  %x:%x， allocate socket for %x\n", inet_ntoa(their_addr.sin_addr), ntohs(their_addr.sin_port), new_fd);
                 pthread_mutex_lock(&connet_count_lock);
                 connect_count++;
                 pthread_mutex_unlock (&connet_count_lock);
                 setnonblocking(new_fd);
                 ev.events = EPOLLIN | EPOLLET;
                 ev.data.fd = new_fd;

                 fdind = fd_index % THREAD_NUMBER;

                 if (epoll_ctl(fdpool[fdind], EPOLL_CTL_ADD, new_fd, &ev) < 0)
                 {
                     fprintf(stderr, "add socket '%d' to epoll fail %s\n",
                             new_fd, strerror(errno));
                     // pool_destroy ();

                     return -1;
                 }

                 fd_index++;
                 //pthread_mutex_lock (&(curfds_lock));
                 // curfds++;
                 // pthread_mutex_unlock (&(curfds_lock));


             }
             else
             {
                 printf("other event \n");
             }
         }
     }
     close(listener);

     // pool_destroy ();
     return 0;
 }

tilera试用

 

tilera处理器架构

前段时间同事搞来了一台使用tilera处理器的服务器，没错，就是那个由MIT专家做的、64个核的处理器，我非常好奇，所以也登上去体验体验。

tilera在硬件之上做了一个薄薄的软件层，叫hypervisior，再在这个hypervisior上装了一个linux，然后是gcc/g++/gdb等一套工具链。当然，这个linux是改过的，在内核arch/tile/目录里增加了东西，但是即使是增加了kernel代码，也只能跑在hypervisior上，不能直接跑在tilera硬件上。

我们用的是tilepro处理器，32位，64个核，每个核却只有863MHZ，所以多进程/多线程的程序有福了，我试了一下make -j60，感觉上确实比较快，但是，configure就慢得夸张。

在tilera上安装apache+php的过程中遇到几个小问题，主要是因为这个linux环境比较荒芜：

1. 从源码安装软件时，运行./configure遇到“configure: error: C compiler cannot create executables”,解决方法：

export CC=”gcc”

export CPP=”gcc -E”

2. ./configure还会遇到不能识别当前机器的处理器类型，解决方法：

./configure --build=i386

不用担心这个欺骗性的i386选项，对于可移植的c代码软件，这样不会造成什么问题。

我安装php最后还是失败了，所以拉倒，改装nginx做测试，起了20个nginx进程，通过千兆网卡做压力，却只能达到3000左右的QPS，这显然太低了。于是问了tilera的技术支持，他反馈说他们做过memcached的实验（据他说，facebook已经在用tilera机器专跑memcached），能到60万QPS，但是nginx多进程却很慢，他们也很疑惑，目前还在研究为什么。

看来tilera的软件层目前还偏薄弱，等一段时间吧，等linux-2.6.36稳定，且tilera的3.0版本的开发工具套件变为stable，我们再来关注关注。

====== 2011.01.06 ======

今天tilera公司的顾冉同学发来新消息，他们就用和我们一样的硬件环境（一片tilepro）和软件环境（MDE-2.1.0），10个左右的并发nginx，达到了将近2万QPS，比x86上的apache差一些，但是比我的测试结果已经好很多了。

也许是我的配置有问题，有待以后研究了。