Linux Performance
- iftop:
Displays per-network-connection traffic every 2,10,40 seconds:
iftop -n -N -P -i ens192 -f 'port 9223' -t -L 15
(remove “-t” to see curses-style ui, “-L” is the number of results to display, “-P” is to show ports.)
Note: To see curses output property in putty, go to “Window > Translation” and tick “Enable VT100 line drawing even in UTF-8 mode”. - Load averages (e.g. top, uptime)
- pidstat:
- Installation:
yum install sysstat - thegeekstuff.com
- Example: 5 samples, one second between each, then give me an average:
pidstat -C cassi -l 1 5
Average: UID PID %usr %system %guest %wait %CPU CPU Command
Average: 1001 27616 0.80 1.39 0.00 0.00 2.19 - pidstat -C cassi -l 1 5
Average: 1001 31248 6.57 3.98 0.00 0.00 10.56 - cassi32 /rTPCCDBFH -rTPCCDBFH
Average: 1001 31254 6.37 3.19 0.00 0.00 9.56 - cassi32 /rTPCCDBFH -rTPCCDBFH
Average: 1001 31260 3.78 1.79 0.00 0.00 5.58 - cassi32 /rTPCCDBFH -rTPCCDBFH
Average: 1001 31264 6.18 2.99 0.00 0.00 9.16 - cassi32 /rTPCCDBFH -rTPCCDBFH
Average: 1001 31266 12.75 7.37 0.00 0.00 20.12 - cassi32 /rTPCCDBFH -rTPCCDBFH
- Installation:
- top:
- “top” in batch mode (i.e. can be redirected to a file) and include command-line args:
top -b -n 1 -c
- “top” in batch mode (i.e. can be redirected to a file) and include command-line args:
Written on October 13, 2020