shared memory size

"Copyright Notice: respect for the original, reproduced please retain the source: blog.csdn.net/shallnet or .../gentleliu, the article is for learning communication only, do not use for commercial purposes"System V shared memory is similar to POSIX

1. Create/acquire a shared memory#include #include / * for Mode constants */#include / * for O_* Constants */int Shm_open (const char *name, int oflag, mode_t mode);Parameters:Name: Shared memory names; Oflag: With the Open

Recently, "High-performance PHP application development," the book read two times, I think it has benefited, the book is more extensive, is an empirical content, suggest that you have time to look at the detailed, based on this deliberately the

Regarding the issue of generating a unique digital ID, is it necessary to generate a random number using Rand and then go to the database query for this number? Feel this kind of words a little time-consuming, is there any other way? Of course not,

Recorded Top Column meaning Vmstat Procs Memory Swap Io System Cpu Uptime Free Iostat Cpu Device Sar Mpstat Pmap Netstat Tcpdump Strace Lsof Proc File system Benchmark Before Linux performance tuning, first need to understand the current service

Oracle Purpose: Install Oracle 9i on Linux 8.0 to ensure database security and stability Software Environment: Linux 8.0 (three CDs) Oracle 9.2.0.1.0 for Linux (three CDs) Hardware environment: P4 2.4, Memory 512M, hard disk 80G high RPM, 16x_dvd

The so-called shared memory is the fastest available IPC form that allows multiple processes to access the same piece of memory space. is designed for inefficient operation of other communication mechanisms. It is often used in conjunction with

System Detection Tool top command in LinuxThis article transferred from: https://www.cnblogs.com/zhoug2020/p/6336453.htmlFirst, describe the meanings of some of the fields in top:Virt:virtual Memory usage Virtual RAM1. The process "required" virtual

This article will share eight essential PHP functions, all of which are very useful: passing any number of function parameters and using glob () search for files, obtain memory usage information, obtain CPU usage information, obtain system constants,

  Most PHP programs install accelerators on the server to improve program efficiency. The eaccelerator accelerator we introduced is actually a free software and is still free of charge. It is also a good choice to save service setup costs;   1.

This article mainly introduces how to configure eAccelerator and XCache extension to accelerate the execution of PHP programs. XCache and ZendOpcache that come with PHP5.5 are the same cache that stores Opcode in the shared memory, for more

This article will share eight essential PHP functions, all of which are very useful: passing any number of function parameters and using glob () search for files, obtain memory usage information, obtain CPU usage information, and obtain system

It can also optimize scripts to accelerate their execution speed. Using eAccelerator can reduce the server load and increase the execution time of PHP code. EAccelerator configuration options:Copy codeThe Code is as follows:Zend_extension_ts = "X:

I. Preparations ◆ 1. Download oracle 9i for linux ◆ 2. Download patches P3006854_9204_LINUX.zip before running runInstaller. (The extracted name is rhel3_pre_install.sh) ◆ 3. Modify the kernel parameters (you don't need to modify the kernel

Eaccelerator. shm_size = "32" The amount of shared memory that eAccelerator can use (in megabytes ). "0" refers to the default value of the operating system. the default value is "0 ". it can be adjusted according to the actual situation of the

Php implements sequential number of Read Memory This article mainly introduces how to read the serial number of the memory in php, which is very simple and practical. For more information, see    Only record, the osc site should have

1, pass any number of function parameters We're in. NET or Java programming, the number of general function parameters is fixed, but PHP allows you to use any number of parameters. The following example shows you the default parameters for PHP

Php code for obtaining CPU usage Share a few php code to get the cpu usage in the current system. if you need it, give it a reference.In php, you can use getrusage () to obtain CPU usage. this method is only applicable to linux systems.

Php implements sequential number of read memory. Php to read the memory sequence number this article mainly introduces php to read the memory sequence number, which is very simple and practical. if you need a friend, you can refer to it for record,

Developers who have done PHP development should be aware that PHP has a lot of built-in features, mastered them, can help you in the development of PHP more handy, this article will share 8 development of the necessary PHP features, all very