Listed below are few handy tools to monitor Linux system performance:<\/p>\n
System Monitoring<\/strong>: This is a graphical tool available in GUI mode, similar to Taskbar iin Windows,where we are have a real time monitoring of CPU usage, memory usage, history, etc.<\/p>\n top<\/strong> : A linux process monitoring command, that refreshes in 5 seconds, that displays CPI, memory usage, swap memory, Process IDs, users, etc<\/p>\n vmstat<\/strong> or sysstat<\/strong>: Displays statistics of the virtual memory, the kernel threads, disks, CPU activity, interrupts, etc<\/p>\n lsof<\/strong> : List of Open Files. This command shows all files that are in open state. This is a command used to check is a specific file is opened, or a backup does not happen since a file is in open state, etc. You may use lsof command with grep to narrow the output.<\/p>\n netstat<\/strong> : A command to get Network statistics to see the listening or established network ports, who is accessing the connection, etc.<\/p>\n iotop<\/strong> : Monitor and display real-time disk IO.<\/p>\n iostat<\/strong> : Is a tool to collect the storage device IO statistics, including reads, writes, etc. This is installed by yum package sysstat<\/p>\n tcpdump<\/strong> : A tool to sniff the network interface. Network packet analyser. The command “tcpdump -i eth0” shows<\/p>\n uptime<\/strong> : Find the uptime of a system<\/p>\n ps<\/strong> : Find the processes running on a host. The command “ps -eaf<\/strong>” is a very useful switch.<\/p>\n free<\/strong> : Command to find the memory utilization in a host.\u00a0The command “free -m<\/strong>” is a very useful switch to see output in MB.<\/p>\n mpstat<\/strong> : Command to see the activities for available processors in a host.\u00a0The command “mpstat -P ALL<\/strong>” is a very useful switch.<\/p>\n tracepath<\/strong> : Trace the path taken by host to reach a destination<\/p>\n ping<\/strong> : Check the availability of a remote host<\/p>\n <\/p>\n","protected":false},"excerpt":{"rendered":"