Visit Our UNIX and Linux User Community


Another NMON


 
Thread Tools Search this Thread
Operating Systems AIX Another NMON
# 1  
Old 11-06-2006
Another NMON

Anyone ever experienced a core dump when running NMON. I am running AIX 5.3 on an 8 CPU LPAR (P570). This has only recently started to happen.
# 2  
Old 11-06-2006
Not personally but:
http://www-128.ibm.com/developerwork...u-analyze_aix/
"Even though IBM doesn't officially support the tool and you must use it at your own risk"
"Usage notes: This nmon tool is NOT OFFICIALLY SUPPORTED. No warrantee is given or implied, and you cannot obtain help with it from IBM."
Any performance tool can case problems. They all add extra load to the cpu and memory, and if the system was in trouble before you started using them they wll often push the system over the edge.
Try using the AIX tools to see if you can work out the problem without nmon.
topas, iostat, vmstat, etc.
# 3  
Old 11-07-2006
I realise this is not a supported tool, the whole reason why I posted a message here. If it was supported I would have reported it ti Call AIX by now.
# 4  
Old 11-08-2006
Solved. This LPAR had been setup wrongly. It has 8 physical CPUs and had been set to 24 logical (48 when lparstat is run). This was effecting the shared memory paging. When I ran nmon as a normal user (not root) the first thing it looked was /dev/kmem (kernel shared memory). When I changed the permissions on the device so world had rights to it the core dump occurred. I have now reduced the logical CPUs down to match the physical and nmon is now working again. Strange.

Previous Thread | Next Thread
Test Your Knowledge in Computers #893
Difficulty: Easy
sed uses regular expressions, such as .* (zero or more of any character).
True or False?

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Can nmon be customized?

Hi, my name is Steve Ngai from Malaysia. This is my first post. Hope to learn more about Unix from this forum. My first question is can nmon be customized? When I run nmon, I need to manually type c to see CPU usage, then m for memory usage. Can I pass it some nmon option to automatically see... (2 Replies)
Discussion started by: ngaisteve1
2 Replies

2. AIX

Please Help With NMON Data

Hi guys, I am an Oracle DBA and I have an account with some databases on an AIX 5.3 server. I am trying to figure out if I really need to add memory to this box or not, the account team keeps pushing me to make a decision and I don't want to waste their money if I don't need to right now, we could... (4 Replies)
Discussion started by: nibbsbitt
4 Replies

3. AIX

aix and nmon

Hi All, First of all, I am a DBA and not an AIX admin. I am new at using this NMON tool. In interactive mode, I can start nmon, push 't' to have the list of process with their statistic (ie cpu% etc.). I would like to know if there is a way to redirect that screen output into a log... (1 Reply)
Discussion started by: Nayas
1 Replies

4. Red Hat

NMON for RHEL45 WS

Hi guys, as per subject i am setting up NMON for the above OS but it is 64-bit Linux. I downloaded the 32-bit NMON for RHEL45 as it is the only one available for RHEL45. However, I ran into problem with the binary file. # ./nmon_x86_rhel45 ./nmon_x86_rhel45: error while loading shared... (13 Replies)
Discussion started by: DrivesMeCrazy
13 Replies

5. AIX

need help on NMON in AIX

HI, I have downloaded nmon 3.3c nmon analyzer, and run the command on aix ./nmon -f After that I have terminated the process and found .nmon file. when i have tried to open that file in nmon analyzer i.e in excel I am getting the error "no valid input data nmon run may have failed" ... (8 Replies)
Discussion started by: manoj.solaris
8 Replies

6. AIX

nmon in aix

Hi, I want to know how to use nmon in aix? I have donwloaded nmon (2 Replies)
Discussion started by: manoj.solaris
2 Replies

7. AIX

Nmon tool

Hi All, I have a p550 server with 4 proc. But when i run nmon analyzer in cpu_sum it show 5 processors cpu0 cpu1 cpu2 cpu3 cpu4. Why it is showing 5 processors. (6 Replies)
Discussion started by: vjm
6 Replies

8. AIX

Nmon tool

How to analyze nmon output or is there any tool for analyzing. (2 Replies)
Discussion started by: vjm
2 Replies

9. AIX

Nmon

HI I´m new on this world. I´m working with nmon and I understand that this tool generates a files that later with excel I can see the graphcial of my server. The problem is that this process is execute manualy and I need to meake automatic. How can I do That. Sorry for my english!! :o (3 Replies)
Discussion started by: jegtoro
3 Replies

10. AIX

nmon

Can any one help where i can find articals about nomn I need to know how to read this tools ┌─CPU-Utilisation-Small-View───────────────────────────────────────────────────┐ │ 0----------25-----------50----------75----------100│ │CPU User% Sys% Wait% Idle%| ... (3 Replies)
Discussion started by: habuzahra
3 Replies

Featured Tech Videos