05-04-2015
Quote:
Originally Posted by
jim mcnamara
The ? means the process is not connected to a controlling terminal.
Since computers are very fast and ps has limited number of significant digits, some small values are rounded down to 0.00.
For example a process could have .004 seconds of actual cpu usage, which would display as 0.00 Any process that shows in ps has to have used at least a tiny bit of cpu to have been created.
Do you have a problem you are trying to solve?
yes i have a problem.(I started playing around with PS becasue of the below issue). Can you please suggest an alternative method for 'disown' command as its not supported in my HP-UX
Korn Shell script in stopped state while running in background
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LEARN ABOUT MOJAVE
rwsnoop
rwsnoop(1m) USER COMMANDS rwsnoop(1m)
NAME
rwsnoop - snoop read/write events. Uses DTrace.
SYNOPSIS
rwsnoop [-jPtvZ] [-n name] [-p PID]
DESCRIPTION
This is measuring reads and writes at the application level. This matches the syscalls read, write, pread and pwrite.
Since this uses DTrace, only users with root privileges can run this command.
OPTIONS
-j print project ID
-P print parent process ID
-t print timestamp, us
-v print time, string
-Z print zone ID
-n name
process name to track
-p PID PID to track
EXAMPLES
Default output,
# rwsnoop
Print zone ID,
# rwsnoop -.Monitor processes named "bash", # rwsnoop -n bash
FIELDS
TIME timestamp, us
TIMESTR
time, string
ZONE zone ID
PROJ project ID
UID user ID
PID process ID
PPID parent process ID
CMD command name for the process
D direction, Read or Write
BYTES total bytes during sample
FILE filename, if file based. Reads and writes that are not file based, for example with sockets, will print "<unknown>" as the file-
name.
DOCUMENTATION
See the DTraceToolkit for further documentation under the Docs directory. The DTraceToolkit docs may include full worked examples with ver-
bose descriptions explaining the output.
EXIT
rwsnoop will run forever until Ctrl-C is hit.
AUTHOR
Brendan Gregg [Sydney, Australia]
SEE ALSO
rwtop(1M), dtrace(1M)
version 0.70 Jul 24, 2005 rwsnoop(1m)