Logical vs physical address  1) An address generated by the CPU is a logical address. Whereas, an address seen by the memory unit, that is, the one loaded into the memory-address register of the memory, is a physical address. 2) The user program neve…

3 registers for starting pos: LDTR, GDTR( register for starting addr of DT) ---段描述符每个段由一个8字节(64位)的段描述符来描述,他表示段的各项属性.段描述符放在叫全局描述符表(Global Descriptor Table:GDT )或局部描述符表(Local Descriptor Table:LDT)中.GDT和LDT可以理解为数组.而段选择符里的索引是用于选择在这个数组当中的元素.如:GDT[index],表…

https://db-blog.web.cern.ch/blog/luca-canali/2014-12-life-oracle-io-tracing-logical-and-physical-io-systemtap Luca Canali on 01 Dec 2014 Topic: This post is about tracing logical and physical reads in Oracle using SystemTap. You find here a few examp…

Embodiments of the invention are generally directed to systems, methods, and apparatuses for linear to physical address translation with support for page attributes. In some embodiments, a system receives an instruction to translate a memory pointer…

在查询性能优化时,Logical Read非常重要,它的计数一般与查询出来的结果集数量成正比,与数据读取的速度也成正比. 1,SET STATISTICS IO 显式Disk IO的信息 Syntax SET STATISTICS IO { ON | OFF } Output item                           Meaning             Table Name of the table. Scan count Number of scans performe…

COMPUTER ORGANIZATION AND ARCHITECTURE DESIGNING FOR PERFORMANCE NINTH EDITION The simplest scheme for partitioning available memory is to use fixed-size partitions, as shown in Figure 8.13. Note that, although the partitions are of fixed size, they…

A system and method for accessing memory are provided. The system comprises a lookup buffer for storing one or more page table entries, wherein each of the one or more page table entries comprises at least a virtual page number and a physical page nu…

An application binary interface includes linkage structures for interfacing a binary application program to a digital computer. A function in a relocatable shared object module obtains the absolute address of a Global Offset Table (GOT) in the module…

Techniques are presented that include determining, for data to be written to a nonvolatile memory, a location in the nonvolatile memory to which the data should be written based at least on one or more wear metrics corresponding to the location. The…

Solid-state storage management for a system, the management including establishing, externally to a solid-state storage board, a correspondence between a first logical address and a first physical address on solid-state storage devices located on the…