View source for Performance monitoring

[[Category:Linux]]
top - Interactive process monitoring tool
 # top

lsof - List open files and sockets/pipes as well
 # lsof

htop - Advanced interactive process monitoring tool
 # htop

iotop - Display real time Disk I/O and process
 # iotop

tcpdump - Network packet capture (Sniffer)
 # tcpdump -i eth0 src host 10.1.1.1 and dst host 10.1.1.10 and port 80
 # tcpdump -w - | tee capture.pcap | tcpdump -r - (write to file and standard output the same time)

Collectl - Powerful and feature rich command line utility that monitors CPU, memory, disk and network

iptraf - Real time IP and network monitoring
 # iptraf

vmstat - Display statistics of virtual memory, kernel, disks, process, I/O blocks and CPU activity
 # vmstat
 # vmstat -s  (other visualization)
 # vmstat -S m (show MB instead of KB)

iostat - Display statistics of CPU, disk I/O and NFS
 # iostat
 # iostat -m   (show MB/sec instead of blocks/sec)
 # iostat -n

Additional tools: iperf, ntop, apache mod_status