The first chapter is relatively plain speaking, a list of what
- Source file is saved as a text file
- Different contexts, the same byte sequence representing different meanings
- Source files are compiled into an object program compilation system, for the implementation of the system
- Pre-compiled C language, compiler, assembler, linker, to generate the target program
- Learn compiler theory, we can help optimize application performance, understanding the link failure, protects against security vulnerabilities
- Internal computer including a CPU, memory, I / O bridge, peripheral bus for communication between them
- CPU is a porter, almost all operations require CPU involvement, the data transfer from one place to another
- DMA may not require CPU involvement, the data is transported directly from the disk to the main memory
- Huge difference in access speed between the various devices, leading to the birth of the cache, CPU> L1 Cache> L2 Cache> L3 Cache> Memory> Disk> Network
- Operating system and hardware connectivity applications, to provide application isolation hardware abstraction, processes, virtual memory and file
- At any time, the CPU can perform a processes, CPU switches to simulate multi-process among the plurality of processes, the need to save the current value of the register when switching up, loads the context information to register another process
- Indeed, a process composed of a plurality of threads, the threads share code and data resources context, the thread corresponds directly to the CPU
- Virtual memory allows each process that only operate in their own memory, program code and data, heap, stack, shared libraries, kernel virtual memory
- Linux, all I / O is a file, including disk, keyboard, monitor, network
- In the history of the computer, there are two goals, faster and do more, running
- CPU single, polynuclear, Hyper-Threading. Hyper-Threading is a core CPU also has two sets of registers and cache, provides two abstract logical thread
- The CPU pipeline technology, can greatly reduce the operating cycle of the task
- Program abstract concept is great, the human brain accommodate content is limited only by one level of abstraction, shielding the underlying details in order to make more extensive system