vmstat reports virtual memory statistics. mpstat reports processors statistics uptime chizhang@chizhang-OptiPlex-7010:~$uptime11:07:59up9days,18:46,1user, load average:0.23,0.51,0.59 The default output for the uptime command is as follows: The current time How long the system has been running ...
PMC 性能监控计数器(Performance monitoring counter, PMC),是处理器上的硬件可编程计数器。PMC 数量众多,是性能分析领域至关重要的资源。只有通过 PMC 才能测量 CPU 指令执行的效率、CPU 缓存的命中率、内存/数据互联和设备总线的利用率,以及阻塞的指令周期等。在性能分析方面使用这些方法可以进行各种细微的性能优化。
vmstat和iostat两个命令都适用于所有主要的类unix系统(Linux/unix/FreeBSD/Solaris)。 磁盘IO是服务器性能的一个重要指标,下面介绍两个常用的观察IO的命令,iostat我一般用来查看磁盘的IO,以及在测试磁盘时做一个监控工具,iotop在排查服务器问题时,可以用来找到某些异常程序!下面都会做一个简要的介绍! 博文中使用的操作...
1.perf的原理 Linux性能计数器是一个基于内核的子系统,它提供一个性能分析框架,比如硬件(CPU、PMU(Performance Monitoring Unit))功能和软件(软件计数器、tracepoint)功能,tracepoints是预埋在内核源码中的一些hook,它们能够在特定的代码被执行到时触发,这一特定能够被各类trace/debug工具所使用。perf将tracepoint产生的...
Hardware Events: CPU的PMU(performance monitoring unit)触发的事件,也叫performance monitoring counters (PMCs),例如cpu-cycles、cache miss Software Events: 一些比较底层的软件event,例如缺页、timer(定时) Kernel Tracepoint Events: 内核中的tracepoint
These commands are available under all flavors of Linux and can be useful to monitor and find the actual causes of performance problem. This list of commands shown here are very enough for you to pick the one that is suitable for your monitoring scenario. 译者信息 对于系统和网络管理员来说...
for everyLinux/Unix System Administrator. These commands are available under all flavors ofLinuxand can be useful to monitor and find the actual causes of performance problem. This list of commands shown here are very enough for you to pick the one that is suitable for your monitoring scenario...
Linux Performance Analysis in 60,000 Milliseconds shows the first ten commands to use in an investigation (video, PDF). Written by myself and the performance engineering team at Netflix (2015). Linux Performance Analysis in 60,000 Milliseconds 显示了调查中使用的前十个命令(视频, PDF)。由我本人...
Performance Monitoring CommandsThese commands provide valuable system performance statistics to help analyze resource utilization, identify bottlenecks, and optimize efficiency.42. vmstat – Report Virtual Memory StatisticsThe vmstat command prints detailed reports on memory, swap, I/O, and CPU activity. ...
系统监控System Monitoring 在Linux中,系统监控是确保系统稳定运行的重要部分。可以使用多种工具来监控系统性能和资源使用情况。 1. 查看系统资源Viewing System Resources 使用top命令可以实时查看系统的CPU和内存使用情况。按q键可以退出。 使用htop命令是top的增强版,提供了更友好的界面和更多的信息。 2. 查看磁盘使用...