The underlying kernel tries to make it appear that the processes run simultaneously . on a multiprocessor system , they really can run simultaneously 底层的内核会尽量使进程看起来像是在同时运行;在多处理器的系统中,它们确实可以同时运行。
Moreover , on a multiprocessor system , disabling interrupts on the local cpu is not sufficient , and other synchronization techniques must be used 此外,在多处理器系统上,在当前cpu上禁止中断是不能正确完成同步功能的,必须同时使用附加的同步技术。
Fifteen years ago , multiprocessor systems were highly specialized systems costing hundreds of thousands of dollars and most of them had two to four processors )十五年前,多处理器系统是高度专用系统,要花费数十万美元(大多数具有两个到四个处理器) 。
Allocation groups also help to optimize parallel io performance on multiprocessor systems , because more than one metadata update can be " in transit " at the same time 分配组还有助于在多处理器系统上优化并行io性能,因为可以同时有多个元数据更新处于“在传输中” 。
The results of simulation show that : in systems that have a lot of of procressors , using router - cache can improve the speed of multiprocessors systems under most conditions 模拟结果表明:在系统中结点数目较多时,采用路由器在多数情况下可以改进应用程序的执行速度。