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, Here you can see which threads are pumping the cpu – have a look, besides the threads dedicated to the web applications (running on port 8080) you are using quite a lof of cpu for the ScannerThread which is responsible of period based scanning for the Deployment of applications.Do you know, what tools are used to troubleshoot or monitor real-time disk I / O performance issues on Linux? This is a shortcut if you’re running your server on localhost: now invoke the operation listThreadCpuUtilization() Thread NameĭefaultQuartzScheduler_QuartzSchedulerThreadĬontainerBackgroundProcessor] Point at the Mbean ServerInfo under the domain jboss.system. If you want to inspect jBoss Thread CPU’s usage you have a shortcut from the jmx-console. Within that folder, you can run operations such as get ThreadCpuTime(Thread) to gather information for a particular thread: Now from the MBeans Tab select the folder: Start the JConsole shell bundled in WildFly: $ bin/jconsole.sh JBoss EAP and WildFly users can use JConsole in order to monitor the usage of the application server. Monitoring WildFly CPU usage with JConsole Here is a screenshot of the Profiler tab showing CPU profiling results:
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