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OSXFAQ Mac OS X UNIX Tip-of-the-Day

Week 103 - Unix Commands Reference III (4 April 2005)

by Adrian Mayo - Editor, OSXFAQ

Tuesday - Commands for System and Kernel Stats

These commands display information on system, memory, and file usage

sc_usage ... display live system call stats
For example, 'sudo sc_usage TextEdit'

fs_usage ... display live file system usage
For example, 'sudo fs_usage TextEdit' then use text edit and open/save files.

lsof ... list open files
For example 'lsof' or 'lsof /dev/console'

fstat ... display file status
For example 'fstat' or 'fstat ~' or 'fsstat ~/letter.doc'

vm_stat ... display virtual memory statistics
Watch out for page-outs increasing by 100's per second: you need to buy more memory or run fewer processes.

(See tips week 88)

latency ... display context switches &interrupts
This must be run as root

dmesg ... display system message buffer
(See tips week 61 - Friday)

ac ... display user connect time for accounting

These commands operate on the kernel.

ktrace ... perform kernel tracing
For example, 'ktrace ls' executes 'ls' and trace it's kernel activity. This produces the file 'ktrace.out'.

kdump ... display a 'ktrace.out' file human readable
For example 'kdump' if the trace file is in the current directory.
Option -f to specify the trace file

zprint ... display information on kernel zones

sysctl ... display and set kernel state variables
Option -a to display all state variables and their current settings

kextload ... kernel extension load

kextunload ... kernel extension unload

kextstat ... display kernel extension statistics

Discuss this trick in the Learning Center forum

If you want to learn more about Mac OS X Unix visit the Learning Center click.

For beginners: Mac OS X Unix Tutorials
For detailed information on specific topics: Advanced Unix
For OS X in gereral: Mac OS X Tutorials


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