本文主要是介绍linux系统分析工具pidstat，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
pidstat主要用于监控全部或者指定进程占用系统资源的情况如CPU,内存,设备IO,任务切换,线程等.pidstat首次运行事显示自系统启动开始的各项统计信息,之后运行pidstat将显示自上次运行该命令以后的统计信息.用户可以通过指定统计的此时和时间来获得所需要的统计信息.该命令是sysstat中的工具,想要使用该命令需要先安装sysstat工具.pidstat命令只有在内核版本为2.6.20版本以后执行才有效.
用法:
输入pidstat --help后显示帮助:
[root@centos democlass]# pidstat --help
Usage: pidstat [ options ] [ <interval> [ <count> ] ]
Options are:
[ -C <command> ] [ -d ] [ -h ] [ -I ] [ -l ] [ -r ] [ -t ] [ -u ] [ -V ] [ -w ]
[ -p { <pid> [,...] | SELF | ALL } ] [ -T { TASK | CHILD | ALL } ]描述:
The pidstat command is used for monitoring individual tasks currently being managed by the Linux kernel. It writes to standard output activities for every task selected with option -p or for every task managed by the Linux kernel if option -p ALL has been used. Not selecting any tasks is equivalent to specifying -p ALL but only active tasks (tasks with non-zero statistics values) will appear in the report.
The pidstat command can also be used for monitoring the child processes of selected tasks. Read about option -T below.
The interval parameter specifies the amount of time in seconds between each report. A value of 0 (or no parameters at all) indicates that tasks statistics are to be reported for the time since system startup (boot). The count parameter can be specified in conjunction with the interval parameter if this one is not set to zero. The value of count determines the number of reports generated at interval seconds apart. If the interval parameter is specified without the count parameter, the pidstat command generates reports continuously.
You can select information about specific task activities using flags. Not specifying any flags selects only CPU activity.
选项：-C comm #只显示那些包含字符串（可是正则表达式）comm的命令的名字-d #显示I/O统计信息（须内核2.6.20及以后）PID #进程号kB_rd/s #每秒此进程从磁盘读取的千字节数kB_wr/s #此进程已经或者将要写入磁盘的每秒千字节数kB_ccwr/s #由任务取消的写入磁盘的千字节数Command #命令的名字-h #显示所有的活动的任务-I #在SMP环境，指出任务的CPU使用（等同于选项-u）应该被除于cpu的总数-l #显示进程的命令名和它的参数-p { pid [,...] | SELF | ALL } #指定线程显示其报告-r #显示分页错误的内存利用率When reporting statistics for individual tasks, the following values are displayed:PID #进程号minflt/s #每秒次缺页错误次数(minor page faults)，次缺页错误次数意即虚拟内存地址映射成物理内存地址产生的page fault次数majflt/s #每秒主缺页错误次数(major page faults)，当虚拟内存地址映射成物理内存地址时，相应的page在swap中，这样的page fault为major page fault，一般在内存使用紧张时产生VSZ #该进程使用的虚拟内存(以kB为单位)RSS #该进程使用的物理内存(以kB为单位)%MEM #当前任务使用的有效内存的百分比Command #任务的命令名 When reporting global statistics for tasks and all their children, the following values are displayed:PID #PID号minflt-nr #在指定的时间间隔内收集的进程和其子进程的次缺页错误次数majflt-nr #在指定的时间间隔内收集的进程和其子进程的主缺页错误次数Command #命令名-s #堆栈的使用-t #显示与所选任务相关的线程的统计数据-T { TASK | CHILD | ALL } #指定必须监测的内容：TASK是默认的，单个任务的报告；CHILD：指定的进程和他们的子进程的全局报告，ALL：相当于TASK和CHILD-u #报告CPU使用When reporting statistics for individual tasks, the following values are displayed: PID%usr #用户层任务正在使用的CPU百分比（with or without nice priority ，NOT include time spent running a virtual processor）%system #系统层正在执行的任务的CPU使用百分比%guest #运行虚拟机的CPU占用百分比%CPU #所有的使用的CPU的时间百分比CPU #处理器数量Command #命令When reporting global statistics for tasks and all their children, the following values are displayed:PID #PID号usr-ms #在指定时间内收集的在用户层执行的进程和它的子进程占用的CPU时间（毫秒）{with or without nice priority，NOT include time spent running a virtual processor)system-ms #在指定时间内收集的在系统层执行的进程和它的子进程占用的CPU时间（毫秒）guest-ms #花在虚拟机上的时间Command #命令-V #版本号-w #报告任务切换情况PID #PID号cswch/s #每秒自动上下文切换nvcswch/s #每秒非自愿的上下文切换Command #命令示例:
$ pidstat 2 5 #Display five reports of CPU statistics for every active task in the system at two second intervals.(每隔两秒输出一份报告统计)$ pidstat -r -p 1643 2 5 #Display five reports of page faults and memory statistics for PID 1643 at two second intervals.(每隔两秒显示1643进程的内存信息统计)$ pidstat -C "fox|bird" -r -p ALL #Display global page faults and memory statistics for all the processes whose command name includes the string "fox" or "bird".$ pidstat -T CHILD -r 2 5 #Display five reports of page faults statistics at two second intervals for the child processes of all tasks in the system. Only child processes with non-zero statistics values are displayed.
http://xuclv.blog.51cto.com/5503169/1166398
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