OpenWest 2014/Linux Performance Tools

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by Ed Felt - DBA/Developer at LDS Church

Keep it simple ... at least at first

No Mockumentation - Document well, even over document

Recommended course - Linux Foundation - Linux Performance Tools (LF426) - ~$3,000

Track changes as you test

Human memory sucks - keep personal notes (journaling)

Keep focused on one variable at a time (Exception: fix it now emergency fire!) - most of us think linearly

Examples:

  • ngrep to troubleshoot Segmentation Fault that doesn't make it to the logs
  • actime0=0 # NFS (?kill it/keep it?)

Stress testing is NOT base-lining/profiling or even troubleshooting

/proc - TLDP describes it as "window" in to kernel and processes

PIDS:

  • /proc/PID/cmdline
  • /proc/PID/cwd
  • /proc/PID/environ
  • /proc/PID/exe
  • ps

CPU:

  • /proc/cpuinfo
  • top

Memory:

  • /proc/meminfo
  • free

Netstat:

  • /proc/net/netstat
  • netstat

Logs:

  • /var/log/messages
  • /var/log/[application]

Write your own:

  • BASH
  • Perl
  • Python

Tools:

  • hdparm -tT /dev/....
  • top
  • sar (sysstat)
  • collectl
  • mlmon

Other tools:

  • watch
  • tail
  • strace
  • iostat
  • vmstat
  • nmon
  • iptraf
  • lsof
  • htop
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