A computer has a limited amount of DRAM and even less cache memory. When a large program or multiple programs are running, it's possible for memory to be fully used. To compensate for a shortage of physical mem
COMA machines are expensive and complex to build because they need non-standard memory management hardware and the coherency protocol is harder to implement. Remote accesses in COMA are often slower than those in CC-NUMA since the tree network needs to be traversed to find the data. ...
关键词:computer architecture(计算机体系结构), memory consistency(内存连贯性[1]), cache coherence(缓存一致性[1]), shared memory(共享内存), memory systems(内存系统), multicore processor(多核处理器), heterogeneous architecture(异构架构), GPU(图形处理单元), accelerators(加速器[2]), semantics(语义学...
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 thecpu caches, but alsowastes physical memory with duplicate data.As per the diagram above, thescene.datcontents are stored twice, and each instan...
are. Kernels use the copy on write mechanism, 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...
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 ...
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
原文地址:http://duartes.org/gustavo/blog/post/what-your-computer-does-while-you-wait Page Cache, the Affair Between Memory and Files 工作于内存和文件之间的页缓存 Previously we looked at how the kernelmanages virtual memoryfor a user process, but files and I/O were left out. This post cov...
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:...
Kernels use thecopy on writemechanism, enabled by page table entries, to implement private mappings. In the example below, both render and another program called render3d (am I creative or what?) have mapped scene.dat privately. Render then writes to its virtual memory area that maps the ...