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 in the use of multi-CPU machines, machines will play better efficiency.