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What is memory pool? I think I must answer the question firstly, because it is important to beginner. In short, memory pool is a memory block which you got from system and use some unit of it to replace the system call malloc/free and new/delete. The advantage of the technology is reuse existing memory block so that reduce the times of system call. It`s a hard work to give the definition. If you still can`t understand the concept, please google it.