Thread Tools Search this Thread
Top Forums Shell Programming and Scripting vmstat
# 1  
Old 07-28-2009


I need to write a script to display VMSTAT every 5 seconds and I just need the memory columns - swap free re and just the numbers and the headers arent required.

For example

bash-3.00$ vmstat 5| awk '{print $4" "$5" "$6}'
disk faults cpu ------ This header isnt required
swap free re ------ This header isnt required
36889520 7061456 11

Also I need to append the output of this comman in a file after every 5 seconds
# 2  
Old 07-28-2009
you can try running it directly
nohup vmstat 5| awk '{print $4" "$5" "$6}' > file &

# 3  
Old 07-28-2009
while :
 vmstat | awk '{print $4" "$5" "$6}' | tail +3 >> stats.log
 sleep 5

# 4  
Old 07-28-2009
Beware that the first line of statistics from vmstat are garbage.
Therefor anchal_khare post will not produce valid results.

Also beware that "vmstat 5" will not stop until it is interrupted or killed.
To get meaningful statistics from vmstat it must be run with at least two iterations:
vmstat 5 2

Then take the statistics from the last line output.
A 5-second snapshot of a unix system would be biased by vmstat itself.

In practice you get a more meaningful statistics from say:
vmstat 30 2

run every 20 mins.
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Linux


I m checking idle time using vmstat, below are the results var=$(ssh wmtmgr@$hostname vmstat | tail -1 | awk '{print $15}') 89 and now im subtracting 89 with 100 & im getting expected results expr 100 - $var 11 Now How can I get the result 11 in one line code? (4 Replies)
Discussion started by: sam@sam
4 Replies

2. Solaris

Vmstat | nawk

I'm trying to parse vmstat output with this: vmstat | nawk '/0/{printf "%s\ \n", $5}' but output is different on two sparc Solaris 10 servers, one is missing line with 'free'. why ? (3 Replies)
Discussion started by: orange47
3 Replies

3. AIX

Need guidance on VMStat

I need some guidance on the differences in observations, not sure how significantly different are they. Also, It would be nice to hear on the values and what the obvious tuning for performance missing. Observation 1 ending vmstat -v 3948544 memory pages ending vmstat -v ... (1 Reply)
Discussion started by: Snipper
1 Replies

4. Linux

vmstat help

Hi everyone, I need to see some VM manager performance/behavior information on some Linux boxes regarding pages scanned/activation of the paging algorithm in order to get an idea if a given server needs more memory and is actually paging. In Aix servers, by using the vmstat cmd you... (1 Reply)
Discussion started by: jcpetela
1 Replies

5. Solaris

Huge PI in vmstat

This is something nowbody around me can explain: vmstat (-S 5) shows a huge number of PI but when I try to monitor it in parallel with iostat - there is no IO activity to be seen that would correspond to this. I have 16G RAM and 32G swap file. I'll really appreciate if somebody can explain it.... (9 Replies)
Discussion started by: dkvent
9 Replies

6. UNIX for Dummies Questions & Answers


Hi I wanted to collect data by using vmstat -I 60 >xxxx.txt & using my own account It was stopped by it self after 2 hours try again same result We want to collect day date by succession how to collect data using vmstat for day Thank you (2 Replies)
Discussion started by: Syed_45
2 Replies

7. UNIX for Advanced & Expert Users


Hi, what does mean the free colomne in out put of vmstat ? is it free espace of physical memory or of swap space on hard disk ? Thank you (4 Replies)
Discussion started by: big123456
4 Replies

8. UNIX for Dummies Questions & Answers


When I exeute vmstat (e.g. vmstat 30 2), in some machines I get some wierd result as the first line. like: -117% or 208% for CPU idle percentage. But the second line is alright. Could someone explain this please. Thanks ! Chaadana (4 Replies)
Discussion started by: chaandana
4 Replies

9. UNIX for Dummies Questions & Answers


Hi, In the unix command, "vmstat" we get information on Page memory. what does the "mf" - "minor fault" is? Regards, Anent (3 Replies)
Discussion started by: anent
3 Replies

10. UNIX for Dummies Questions & Answers


I have MATLAB INSTALLED IN MY SUN MACHINE >> WHENEVER I USE IT THE CPU USAGE SHOWS ABT 90% Seeing the vmstat shows that system calls and context switch counters reach a very high value . What are these counters ( Man pages do not give much info on that) .... The only thing i can make out that... (1 Reply)
Discussion started by: DPAI
1 Replies
Login or Register to Ask a Question