shell script to monitor cpu and memory usage in linux

On Debian/Ubuntu $ sudo apt install sysstat On Fedora and CentOS/RHEL 8 $ sudo dnf install sysstat Iostat tool is part of sysstat package which can be installed from the official Linux distributions repository. The iostat command generates two types of reports, The iostat command generates reports that can be used to change system configuration to better balance the input/output load between physical disks.Īll statistics are reported when the iostat command runs every time. On multiprocessor systems, CPU statistics are calculated system-wide as average among all processors. The iostat command is used to monitor system input/output device loading by observing the time the devices are active in relation to their average transfer rates. Iostat is used to report Central Processing Unit (CPU) statistics and input/output statistics for devices and partitions. SWAPIN: It shows only the swap usage of each process.IO: It shows Input/Output utilization of each process, which includes disk and swap.Iotop is similar to top command utility, for displaying real-time disk activity. These commands are widely used to identify performance issues with storage devices, including local disks or Network File System. To derive and verify the I/O Statistics in detail, iotop and iostat commands will be used predominantly. If the disk I/O operation is high or fluctuating, it could be a possible cause for performance lag for which the disk I/O statistics on the system has to be verified. Server performance degradation might occur due to high disk Read Write I/O operation on the storage devices and partitions, irrespective of CPU and Memory usage on the system. I would recommend to check the wa field in the top command output to figure out, if there is any high I/O Read & Write operations on the storage devices and partitions (such as Hard disk drives, SSD, and Disk partitions).

If you do not find any performance issues with respect to resource utilization, especially with CPU and Memory, other fields will be opted to identify the bottlenecks. This is the first level of troubleshooting which is widely performed by Linux Administrator in the real world. In General, top command will be used to view system performance, when an application performance is slow,

Do you know, what tools are used to troubleshoot or monitor real-time disk I / O performance issues on Linux?

Shell script to monitor cpu and memory usage in linux