The ability of cache memory to improve a computer's performance relies on the concept of locality of reference. Locality describes various situations that make a system more predictable. Cache memory takes advantage of these situations to create a pattern of memory access that it can rely upon. ...
Uniform Memory Access (UMA) architecture means the shared memory is the same for all processors in the system. Popular classes of UMA machines, which are commonly used for (file-) servers, are the so-called Symmetric Multiprocessors (SMPs). In an SMP, all system resources like memory, ...
Ch 1. Introduction to Computer Architecture &... Ch 2. Data Representation in Digital... Ch 3. Arithmetic in Computer Binary Ch 4. Boolean Logic Gates & Functions Ch 5. Digital Circuit Theory: Combinational... Ch 6. Digital Circuit Theory: Sequential... Ch 7. How Memory Functions in a...
Sadly, in a regular file read the kernel must copy the contents of the page cache into a user buffer, which not only takes cpu time and hurts the cpu caches, but also wastes physical memory with duplicate data. As per the diagram above, thescene.datcontents are stored twice, and each ...
硬件模型Memory barrier跟cache的实现有很强的相关性, 掌握cache的实现硬件对理解memory barrier很有帮助. 以基本的MESI协议为例, 它主要实现了4种状态: Modified. Cache lines in the “mo… J.FW发表于Linux... 动手写一个基础 cache IP 本文使用 Zhihu On VSCode 创作并发布翻译与整理于《计算机组成与设计 ...
they are.Kernels use thecopy on writemechanism, enabled by page table entries, to implement private mappings.In the example below, bothrenderand another program calledrender3d(am I creative or what?) have mappedscene.datprivately.Renderthen writes to its virtual memory area that maps the file:...
Previously we looked at how the kernel manages virtual memory for a user process, but files and I/O were left out. This post covers the important and often misunderstood relationship between files and
they are. Kernels use thecopy on writemechanism, enabled by page table entries, to implement private mappings. In the example below, bothrenderand another program calledrender3d(am I creative or what?) have mappedscene.datprivately.Renderthen writes to its virtual memory area that maps the ...
they are.Kernels use thecopy on writemechanism, enabled by page table entries, to implement private mappings.In the example below, bothrenderand another program calledrender3d(am I creative or what?) have mappedscene.datprivately.Renderthen writes to its virtual memory area that maps the file:...
As always with performance,measurement is everything, but memory mapping earns its keep in a programmer's toolbox.The API is pretty nice too, it allows you to access a file as bytes in memory and does not require your soul and code readability in exchange for its benefits.Mind youraddress...