Server Performance

Posted 5 years ago - updated 5 years ago sysadmin performance

Atop

• atop -d disc access
• atop -c cpu access
• atop -p Process Information In Cumulative Manner
• atop -u Cumulative Manner for user
• atop -n network usage
  • atop -g general
  • atop -a all
  • atop -v verbose
  • atop -y show threads

Shortcuts

• m memory usage

Log files

• write to log file (binary) atop -w /tmp/atop.txt
• read from log file (binary) atop -r /tmp/atop.txt

Output

• SYSCPU show system side CPU usage
• USRCPU shows user side CPU usage
• VSIZE shows virtual memory size
• RSIZE shows real memory size
• RDDSK shows disk read
• WRDSK shows disk write
• RNET shows network receive
• SNET shows network send
• CPU shows CPU usage percentage

• CMD shows related command

• RRDSK shows read disk
• WRDSK shows write disk
• WCANCL
• DSK shows general disk usage
• CMD shows related command

 Sar

-sar -u user info

• sar -r memory info
• sar -d disc info