OpenWest 2014/Linux Performance Tools: Difference between revisions
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Latest revision as of 15:28, 11 May 2014
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