共享记忆体是指同一块记忆体区段被一个以上的行程所分享。这是我们所知速度最快的行程间通讯方式。使用共享记忆体在使用多CPU的机器上，会使机器发挥较佳的效能。-shared memory is with a memory segment was more than one trip to share. We know this is the fastest means of communication between the itinerary. The use of shared memory i