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top output for a specific process to a file

 
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# 1  
Old 08-24-2009
top output for a specific process to a file
Hi,

I have the following script, and it is driving me nuts.
It just hangs, I've tried all kinds of tricks, but it won't work.
I know it can, it is pretty straight forward.

It hangs when it tries to output $X

Any help appreciated!

PHP Code:
#!/bin/bash
set -o xtrace
command="top -b"
process1="ksoftirqd"
testFile=testFileTop_`uname -n`
echo "testFile: " $testFile
echo > $testFile
echo "timeStamp ms1Rss ms1Vsize ms2Rss ms2Vsize ms3Rss ms3Vsize ms4Rss ms4Vsize msmlConRss msmlConVsize" > $testFile
for ((;;)); do
  currentTime=`date| awk '{print $4}'`
  echo "currentTime: " $currentTime
  echo "command    : " $command
  echo "process1   : " $process1
  X=`$command | grep $process1 | awk '{print $8" "$9}'`
  echo $currentTime $X >> $testFile
  sleep 3s
  cat $testFile
done 
# 2  
Old 08-24-2009
Add the option -n1 to the top command:

Code:
command="top -b -n1"

# 3  
Old 08-24-2009
I see a few things going on. Perhaps one of them is causing your problem. I mostly suspect your top command:

Code:
command="top -b"

This command will run until killed or until it reaches the number of iteration set by -n (see top man page). So, this may help:

Code:
command="top -b -n 1"

Also, some other stuff. I would rewrite some lines as:

Code:
echo "testFile: $testFile"
echo > $testFile --- This line doesn't do anything.  You overwrite it on the next line
...
for ((;;)); do --- don't know what this does.  Endless loop?
currentTime=`date +%T`
echo "currentTime: $currentTime"
echo "command    : $command"
echo "process1   : $process1"
...

Just some suggestions. Hope something here helps
# 4  
Old 08-24-2009
You may find this task easier with "ps" rather than "top". In my version of "top" you only get the first page.
# 5  
Old 08-25-2009
Thank you Franklin52 and mglenney, that is great, it now works.
I was beating myself up for an hour or more trying to get it to work.
this is the required output
PHP Code:
[sroot@duqaMX52L-27253 dk]# cat testFileTop_duqaMX52L-27253
timeStamp ms1Rss ms1Vsize ms2Rss ms2Vsize ms3Rss ms3Vsize ms4Rss ms4Vsize msmlConRss msmlConVsize
11:59:30 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
11:59:34 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
11:59:37 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
Quote:
Originally Posted by methyl
You may find this task easier with "ps" rather than "top". In my version of "top" you only get the first page.
@methyl: I'd be very interested in finding out how to do the same with ps for a specific process.
# 6  
Old 08-28-2009
bump

@methyl: I'd be very interested in finding out how to do the same with ps for a specific process.
# 7  
Old 08-29-2009
The "ps" command varies across operating systems and we don't know which one you are using.

In general the equivalent of what you are doing is:

Code:
ps -ef | grep "ksoftirqd"
Or on some versions:
ps -axl | grep "ksoftirqd"

In many versions of "ps" you can get more sophisticated by using "-o" switch to select the columns to be output.
Once you know the numeric process ID you can monitor an individual process more efficiently with:

Code:
ps -fp<process_id>

 
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