07-26-2009
Identifying IO without the use of IOTop
Hey,
I'm in the process of working on a script to identify IO usage on a high IO server I have setup (Debian Etch). My question is how can identify specific processes that are using much of these resources, I can identify the processes using IOTOP, but doing it remotely via script can be a pain since I have to grep and awk through the entire content in real time.
I also can look at the open file handles via:
lsof | awk '{print $2}' | sort | uniq -c | sort -k1 -g
But that doesn't give sound enough proof as I'm looking for an abusive user not specifically something that has X amount of file handles open.
Does anyone have to identify specific processes that are either writing or reading excessively?
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pid(n) Tcl Built-In Commands pid(n)
__________________________________________________________________________________________________________________________________________________
NAME
pid - Retrieve process identifiers
SYNOPSIS
pid ?fileId?
_________________________________________________________________
DESCRIPTION
If the fileId argument is given then it should normally refer to a process pipeline created with the open command. In this case the pid
command will return a list whose elements are the process identifiers of all the processes in the pipeline, in order. The list will be
empty if fileId refers to an open file that is not a process pipeline. If no fileId argument is given then pid returns the process identi-
fier of the current process. All process identifiers are returned as decimal strings.
EXAMPLE
Print process information about the processes in a pipeline using the SysV ps program before reading the output of that pipeline:
set pipeline [open "| zcat somefile.gz | grep foobar | sort -u"]
# Print process information
exec ps -fp [pid $pipeline] >@stdout
# Print a separator and then the output of the pipeline
puts [string repeat - 70]
puts [read $pipeline]
close $pipeline
SEE ALSO
exec(n), open(n)
KEYWORDS
file, pipeline, process identifier
Tcl 7.0 pid(n)