厦门莫格电气自动化有限公司销售ABBSPFCS01/IMHSS03欢迎来电咨询！​SPFCS01/IMHSS03SPFCS01/IMHSS03您迈开询价的一小步，我还您成功的一大步。E***6802是英创公司推出的基于Freescalei.MX6DL双核处理器(ARMCortex-A9，主频1GHz)的高性能工控主板，预装正版WindowsEmbeddedCompact7(WEC7)嵌入式操作系统，WEC7一个***重要的特性就是对多核处理器的支持(SymmetricMulti-Processing(***P))，下面将通过应用程序来测试在单核和多核情况下系统的执行情况，为了更直观的比较，同时参与测试的还有E***3354，E***3354是基于TICoertex-A8处理器的工控主板，CPU主频1GHz，同样预装WEC7操作系统。所设计的测试程序代码如下，其中的Test***p函数有两个输入参数，***参数表示要创建测试线程的数量，第二个参数为所创建线程的运行时长。cbTest***p是被创建的测试线程，测试线程主要是在一个while循环中，反复读取内存变量然后与预设值进行比较，在运行设定的时间后自动退出循环，其中的threadParam->loops变量会记录下while循环总共执行的次数。typedefstruct_***P_THREAD_PARAM{UINT32durationMs;UINT32threadId;UINT64loops;BOOLbSetAffinity;UINT32sandBoxSize;LPVOIDsandBoxStart;}***P_THREAD_PARAM,*P***P_THREAD_PARAM;ULONGcbTest***p(LPVOIDparam){P***P_THREAD_PARAMthreadParam=(P***P_THREAD_PARAM)param;DWORDtStart=GetTickCount();UINT8*buffer=(UINT8*)threadParam->sandBoxStart;wprintf(L"Ahou,Thread%d,runningfor%dms\r\n",threadParam->threadId,threadParam->durationMs);//Writetosandboxfor(UINT32i=0;i<threadParam->sandBoxSize;i++){buffer[i]=(UINT8)(i);}while((GetTickCount()-tStart)<threadParam->durationMs){//Readbackfromsandboxfor(UINT32i=0;i<threadParam->sandBoxSize;i++){if(buffer[i]!=(UINT8)(i)){wprintf(L"Thread%d:erroratbyte%dforloop%I64d!!\r\n",threadParam->threadId,i,threadParam->loops);}}threadParam->loops++;}wprintf(L"Thread%d:terminating\r\n",threadParam->threadId);return0;}voidTest***p(UINT32nNumOfThread,UINT32durationMs){UINT32i;P***P_THREAD_PARAMthreadParams;HANDLE*threadHandles;UINT64totalLoops=0;UINT32sandBoxSize=1024*128;//128kBHANDLEh_array[1];threadParams=(P***P_THREAD_PARAM)malloc(nNumOfThread*sizeof(***P_THREAD_PARAM));if(threadParams==NULL){wprintf(L"Failedallocatingthreadparams!\r\n");return;}threadHandles=(HANDLE*)malloc(nNumOfThread*sizeof(HANDLE));if(threadHandles==NULL){wprintf(L"Failedallocatingthreadhandles!\r\n");return;}for(i=0;i<nNumOfThread;i++){threadParams[i].bSetAffinity=TRUE;threadParams[i].threadId=i;threadParams[i].durationMs=durationMs;threadParams[i].loops=0;threadParams[i].sandBoxSize=sandBoxSize;threadParams[i].sandBoxStart=malloc(sandBoxSize);threadHandles[i]=CreateThread(NULL,0,cbTest***p,&threadParams[i],0,NULL);wprintf(L"Threadhandle%d:0x%x\r\n",i,threadHandles[i]);}h_array[0]=threadHandles[0];DWORDres=WaitForSingleObject(h_array[0],INFINITE);Sleep(500);if(res==WAIT_TIMEOUT){wprintf(L"Timeoutwaitingforthreads!\r\n");}else{wprintf(L"Allthreadsexited\r\n");}for(i=0;i<nNumOfThread;i++){wprintf(L"Thread%ddidrun%I64dloops\r\n",i,threadParams[i].loops);totalLoops+=threadParams[i].loops;free(threadParams[i].sandBoxStart);CloseHandle(threadHandles[i]);}wprintf(L"Totalnumberofloops%I64d(%I64dmilli***)\r\n",totalLoops,totalLoops/1000000);free(threadHandles);free(threadParams);}将上述测试代码编译生成为exe文件，分别在E***3354和E***6802上运行，设置while循环的执行时间均为10000ms，测试结果如下：1、创建单个线程测试主板与线程E***3354（1GHz单核Cortex-A8）E***6802（1GHz双核Cortex-A9）循环次数67917493当测试程序只创建一个测试线程时，E***3354的while循环执行了6791次，E***6802执行7493次，虽然E***6802为双核处理器，但由于程序只有一个线程，即同一时刻只有一个线程在运行，所以在相同的时间内，循环的次数仅略多于E***3354。由于E***3354和E***6802的CPU主频同样都是1GHz，所以可以认为E***6802多出的循环次数也就是Cortex-A8与Cortex-A9在代码执行效率上的差别。功能随主板型号的不同而有所不同)