Recently I realized that I have 4 GB dedicated video memory and 8 Shared system memory. Can someone explain me the difference between them in a simple language? As I understood dedicated one is the main one, but idk are they working together at the same time or one is working and another is not.
TL; DR关闭sudo的密码安装open-vm-tools安装gnome-tweak以及利用它改DPI、换主题、换图标包、关掉回收站甚至桌面上的所有图标 所以说这个东西真的很重要安装fishshell和中文输入法（fcitx & Google pinyin）先看一下刚安装完成的样子0x01 关掉sudo的密码vis…
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Project 3b: Shared Memory in xv6 Objectives. There are two objectives to this assignment: To familiarize you with the xv6 virtual memory system. To add shared memory segments. Overview. In this project, you'll be adding a new simple facility to allow different processes to share memory pages. Sound simple? Good! At least you think things sound simple. Details
Nov 12, 2014 · Bus-based shared memory. each addr in cache as either shared (S) or exclusive (X) invariant: addr X in exactly one cache OR X in no caches and has same value in all S caches and in memory; Bus-based shared memory. Reads: CPU can read from its own cache if S or X; Otherwise, set cache to S, any cached X to S, fetch from X cache or memory (uses bus)
Mar 11, 2019 · With all necessary modifications made, xv6 should trap and kill any process that tries to access a null pointer. Additional Specifications. Kill the process when it is accessing any address in the first four ‘null’ pages, though this behavior will be changed to support shared memory in Part C. Hints
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In MMIO, a portion of physical memory is hardwired to the registers of some I/O devices, so the same load/store instructions typically used to access memory can be used to access device registers. You’ve already seen one IO hole at physical address 0xA0000 (we use this to write to the VGA display buffer).