Tuning System Chapter--CPU, memory

CPU is the root of the stable operation of the operating system. The Linux kernel identifies multi-core processors as multiple separate CPUs, such as two dual-core CPUs under the Linux system as 4 single-core CPUs, and two dual-cores CPU performance in terms of performance compared to 4 single-core CPUs by 25%-30%.
Applications where CPU bottlenecks may occur dynamic Web applications, mail servers

Memory is also an important factor that affects Linux performance; The system process is blocked, the application becomes slow, and the memory is too large to waste. The maximum memory for a 32-bit processor Linux operating system is 8G. and limited by the range addressed by the processor, on 32-bit Linux systems, applications can use up to 2G of memory for a single process.
Potential memory bottlenecks for applications with database servers, static Web servers

Kernel Optimizations
If the system is deployed database application----system shared memory segment "Kernel.shmmax,kernel.shmmni,kernel.shmall", System semaphore Kernel.sem, file handle Fs.file-max and other parameters to optimize
If you are deploying a Web application----you need to optimize network parameters based on Web application features Net.ipv4.ip_local_port_range, Net.ipv4.tcp_tw_reuse, Net.core.somaxconn and other network kernel parameters

Application optimization
The core of optimization

System performance analysis guidelines and optimization principles
Objective----Performance tuning is a system that can effectively utilize various resources, maximizing application and system to achieve a perfect integration.

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Tuning System Chapter--CPU, memory