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。
The 1 . 4 . 1 jdk further improves the effectiveness of garbage collection by adding new multithreaded collection options for multiprocessor systems and very large heaps Jdk 1 . 4 . 1通过增加新的针对多处理器系统和非常大的堆的多线程收集选项,进一步改进了垃圾收集的效率。
However , if your application is deployed on a multiprocessor system or uses a very large heap , you may get some performance boost from changing collector options 不过,如果您的应用程序是部署在多处理器系统上或者使用非常大的堆,那么改变收集器选项可能会有巨大的性能提升。
Since a cache memory system can reduce the need for main memory access , it greatly reduces the potential memory access contention in shared memory multiprocessor systems 可以把cache看成是主存与cpu之间的缓冲适配器,借助于cache ,可以高效地完成dram内存和cpu之间的速度匹配。
Moreover , the mp - chip can be used as the basis to construct heirarchical multiprocessor systems with different communication latency in different layers 此多处理机晶片可被更进一步的用以建构阶层式多处理机系统,不同阶层间具有不同之通讯网路,使得此多处理机系统具有更佳之延展性。
This month , he goes a step further and examines how the 1 . 4 . 1 jvm actually handles garbage collection , including some of the new garbage collection options for multiprocessor systems 本月,他进一步探讨jvm 1 . 4 . 1是如何实际处理垃圾收集的,包括一些针对多处理器系统的新垃圾收集选项。