02-20-2009
things root can't do
Hey all my co-workers and I are trying to put together a list of things root "Can't" do on any *NIX OS, so I wanted to come here and see what all we could come up with.
Here are two to start this off:
write to a read only mount FS
kill a tape rewind
Please add what you know.
Thanks,
-Stephen
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LEARN ABOUT DEBIAN
stress
STRESS(1) User Commands STRESS(1)
NAME
stress - tool to impose load on and stress test systems
SYNOPSIS
stress [OPTION [ARG]] ...
DESCRIPTION
`stress' imposes certain types of compute stress on your system
-?, --help
show this help statement
--version
show version statement
-v, --verbose
be verbose
-q, --quiet
be quiet
-n, --dry-run
show what would have been done
-t, --timeout N
timeout after N seconds
--backoff N
wait factor of N microseconds before work starts
-c, --cpu N
spawn N workers spinning on sqrt()
-i, --io N
spawn N workers spinning on sync()
-m, --vm N
spawn N workers spinning on malloc()/free()
--vm-bytes B
malloc B bytes per vm worker (default is 256MB)
--vm-stride B
touch a byte every B bytes (default is 4096)
--vm-hang N
sleep N secs before free (default is none, 0 is inf)
--vm-keep
redirty memory instead of freeing and reallocating
-d, --hdd N
spawn N workers spinning on write()/unlink()
--hdd-bytes B
write B bytes per hdd worker (default is 1GB)
--hdd-noclean
do not unlink files created by hdd workers
Example: stress --cpu 8 --io 4 --vm 2 --vm-bytes 128M --timeout 10s
Note: Numbers may be suffixed with s,m,h,d,y (time) or B,K,M,G (size).
SEE ALSO
The full documentation for stress is maintained as a Texinfo manual. If the info and stress programs are properly installed at your site,
the command
info stress
should give you access to the complete manual.
stress 1.0.1 August 2009 STRESS(1)