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the command from the history command file into the current History command buffer;-W: Writes the current History command buffer command to the history command file; -d: Remove the-n ;: Read the specified fileThe history command is saved to the ". Bash_history" file in the user's home directory. Files that start with a dot (.) on a Linux system represent hidden files, which are usually system files.Cat ~/.bash_historyHistory saves 1000 executed comman
Today introduced a Linux system server performance detection Tools-nmon and Nmon_analyser (Generate performance report of free tools), pro-Test available.I. INTRODUCTIONThe Nmon tool helps to display all of the important performance optimization information on one screen and dynamically updates it. This efficient tool can work on any dumb screen, Telnet session, or even dial-up lines. In addition, it does n
automatically expand-c,-D,-I,-n and-s lists-V,--vmstat equals-pmgdsc-d Total--BW,--blackonwhite change colors to white background terminal--float force float values on screen--integer force integer values on screen--nocolor Disable colors (implies--noupdate)--noheaders Disable Repetitive headers--noupdate Disable Intermediate Updates--output file write CSV output to fileDelay is the delay in seconds between each update (DEFAULT:1)Count is the number of updates to display before exiting (default
Use of the linux server performance detection tool nmonToday, we will introduce nmon and nmon_analyser (a free tool for generating performance reports), a linux system server performance testing tool.I. IntroductionThe nmon tool can display all important performance optimization information on a single screen and dynamically update it. This efficient tool can wor
Linux system status detection and process control I. proc file system the commands we usually input: ifconfig, hostname, free (view memory usage), df (view hard disk usage ), where does the uname command obtain the information? The answer is proc! Check out: jerry @ why :~ $ Cat/proc/versionLinux version 3.2.0-23-generic-pae (buildd @ palmer) (gcc version 4.6.3 (
Valgrind is a GPL software used for memory debugging and code analysis of Linux (for x86, amd64 and ppc32) programs. You can run your program in its environment to monitor memory usage, such as malloc and free in C or new and delete in C ++. With the valgrind toolkit, You can automatically detect many memory management
fame tree.h, Tree.cpp, Badleak.cpp, the generated executable program is badleak, test it with Memcheck, output is as follows.Listing 12The sample program is the process of building a tree, with each tree node having a size of 12 (considering memory alignment), a total of 8 nodes. As can be seen from the above output, all memory leaks are discovered. Memcheck divides me
follows.Listing 12The sample program is the process of building a tree, with each tree node having a size of 12 (considering memory alignment), a total of 8 nodes. As can be seen from the above output, all memory leaks are discovered. Memcheck divides memory leaks into two types, one is the possible memory
One of the most troubling problems with C + + is memory management, and sometimes it takes days to find a memory leak or a memory access crossing, and if there is a tool that can help us do this, Valgrind is just one of those tools. Valgrind is a software suite that runs on the x86, AMD64, and PPC32 architectures base
Article Title: preventing Memory leakage use Valgrind for checks in Linux. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. One of the most troublesome problems in C/C ++ development
Article Title: how to detect memory leaks in linux. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. 1. Development Background: When using VC Programming in windows, we usually nee
address, and updates the Process pages tableIf physical memory exists, but is exhausted. The department page is retired to the physical disk according to the memory replacement algorithm.The virtual address space of a process has several concepts. Such as:the principle of memory allocation:From the operating system perspective, the process allocates
Linux can use the Hdparm tool to view the relevant information on the hard disk or the hard drive to speed, optimize, modify the relevant parameters of the hard disk settings. I mainly use this tool to test the speed of the hard disk. Hdparm (hard disk parameters) Function Description: Display and set the parameters of the hard disk. Grammar: The code is as follows: Hdparm [-cfghiiqttvyyz][-a 1>][-p][-p Parameter description: -a -a -C Sets
Linux Driver Development III (the memory of hardware knowledge that must be understood) This article focuses on the basic knowledge of memory, the network on the Ram,rom,flash, etc. have a very detailed introduction, Lao Xie will these knowledge points summarized and annotated as follows. This process of finishing is also a process of deepening
follows.Listing 12The sample program is the process of building a tree, with each tree node having a size of 12 (considering memory alignment), a total of 8 nodes. As can be seen from the above output, all memory leaks are discovered. Memcheck divides memory leaks into two types, one is the possible memory
, and how the specific allocation needs to be considered in different scenarios. JVM to Java permanent generation, Java heap (new generation and old age), line stacks, Java The need for the memory used by NIO.2. Memory leak issuesAnother case is that the 8g memory server, Linux
permanent generation, Java heap (new generation and old age), line stacks, Java The need for the memory used by NIO.2. Memory leak issuesAnother case is that the 8g memory server, Linux uses 800m, the monitoring process uses 600m, the heap size is set to 4g, the system avai
old age), line stacks, Java The need for the memory used by NIO.2. Memory leak issuesAnother case is that the 8g memory server, Linux uses 800m, the monitoring process uses 600m, the heap size is set to 4g, the system available memory
old age), line stacks, Java The need for the memory used by NIO.2. Memory leak issuesAnother case is that the 8g memory server, Linux uses 800m, the monitoring process uses 600m, the heap size is set to 4g, the system available memory
Release the page in the Linux Kernel partner system. The main function is free_pages ()I. Upper-layer operationsWww.2cto.com/* Release with a virtual address */Void free_pages (unsigned long addr, unsigned int order){If (addr! = 0 ){VM_BUG_ON (! Virt_addr_valid (void *) addr ));_ Free_pages (pai_to_page (void *) addr), order);/* release function */}}Www.2cto.com/* Release page */Void _ free_pages (struct page * page, unsigned int order){If (put_page_t
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