In addition to providing a holistic, interactive view of your system, you can also run nmon in batch mode to collect long-time performance data from your system for posterior analysis. When you're done, press Q to quit and end the monitoring session. It also aids in troubleshooting issues by displaying different metrics simultaneously, providing a holistic view of the system and improving your ability to understand issues. Learning path: Getting started with Red Hat OpenShift Service on AWS (ROSA)īecause you can enable and disable different monitors and metrics at any time, nmon is a highly flexible tool that helps you to understand your system's behavior.How to explain modern software development in plain English.10 resources to make you a better communicator.Explore training and certification options. For example, use D for Disk I/O, M for Memory, and T for Top processes. │I/F Name iErrors iDrop iOverrun iFrame oErrors oDrop oOver.│Ĭontinue to press other keys to stack additional metrics in the same view. │I/F Name Recv=KB/s Trans=KB/s p_in p_out in_sz out_sz Peak->.│ Pressing N toggles the network display and automatically stacks it under the CPU display: ┌─16k────Hostname=f35ks01─Refresh= 2secs ─18:17:01─┐ │ k = Kernel t = Top-processes q = Quit │ │ r = Resource N = NFS h = more options │ │ m = Memory V = Virtual memory j = File Systems │ │ C = " WideView U = Utilisation + = Slower screen updates│ │ c = CPU l = CPU Long-term - = Faster screen updates│ │Use these keys to toggle statistics on/off: │ │ProcessorChips=4 PhysicalCores=1 Sockets=4 Cores=1 Thrds=1│ │Vendor=AuthenticAMD Model=AMD EPYC-Milan Processor │ │Fedora release 35 (Thirty Five) VERSION="35 (Thirty Five)" │ You're presented with an initial screen containing system information and a little help menu, displaying which keys you can press to toggle different metrics: $ nmon With the applications installed, you can monitor your system interactively by running nmon. Now that you have installed nmon, use it to monitor your system. Then install nmon using dnf: $ sudo dnf -y install nmon To install nmon, first enable EPEL: $ sudo dnf -y install \ For example, use DNF to install it on Fedora 35: $ sudo dnf -y install nmonįor Red Hat Enterprise Linux or CentOS, nmon is available in the Extra Packages for Enterprise Linux (EPEL) repository. Nmon is available in the default repository of many Linux distributions. This article looks at this powerful monitoring tool. For more information about nmon for Linux, consult the project's official page. In addition to interactively monitoring your system, you can also use nmon in batch mode to collect and save performance data for analysis. By inspecting several resources simultaneously using nmon, I discovered it was an application issue caused by opening too many files. By using nmon, I was able to troubleshoot some hard-to-spot issues, including one that initially seemed like a network bottleneck. I used nmon for the first time about 10 years ago as an AIX sysadmin. Each of them presents the data differently. Without nmon, you have to use specialized monitoring tools like top for processes, iostat for disks, and ifstat for the network to monitor various resources. The main benefit of nmon is that it allows you to monitor different aspects of your system, such as CPU utilization, memory, disk busy, network utilization, and more, in a single, concise view.
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