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Nmon - a nice monitoring tool for Linux

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http://www.linuxandlife.com – Although not as popular as top or htop, nmon is still one of the best monitoring tools for Linux. Nmon is a tuner, benchmark and system administrating tool. Nmon displays many system performance info cpu, memory, hard drive, network .. By default, nmon updates output data once every two seconds. However, you can easily change this interval to any time period that you prefer. Perhaps the nicest feature of nmon is you can also it to capture data for a period in spreadsheet output format (.csv) to study or write performance report, which can be very useful if you are administrating a linux dedic (Distributions)

Tasshin's picture
Submitted by Tasshin on 03/07/2012 – Made popular on 03/07/2012

Stories similar to Nmon - a nice monitoring tool for Linux

The sys admin's daily grind 3 years 1 day ago

Nmon monitors system information. You can usethe Nmon’s capture mode to output data to a file, then extract the values you need with a script.

AIX CPU waits 1 year 1 day ago

Guys,

I have a question - when nmon reports a sizeable %CPU wait, does that mean -

1) IO operations are slowing CPU down, OR 2) paging slowing the CPU down, OR 3) one cant tell??

I thought the nmon documentation clearly suggested that CPU waits reported in nmon were from disk operation latencies.

Thoughts??

Sudden burst in free memory 48 weeks 3 days ago

I'm experiencing some strange memory management behaviour on Squeeze with Kernel 2.6. I'm trying to get to the bottom of this with nmon.

Sometimes this will freeze up the system for 30 seconds to 5 minutes.

The server has 4GB of RAM.

The figures from nmon are:

+1.6GB memfree.

Hi, I'm having trouble running nnom under SLES 11 SP 1. The only version of nmon I can find is for SLES 10, but from what I can tell it should work.

CPU monitoring query 50 weeks 14 hours ago

Hi all, I am a DBA , I want to take the output of topas command result in every 1minute to write on the output file. If I redirected the file it attached with some control M characters. Nmon and sar commands are not working. only topas working in my AIX environment. Please suggest me on this.

Thanks in advance.

Regards, Kumar

Hello All

I have a system running AIX 61 shared uncapped partition (with 11 physical processors, 24 Virtual 72GB of Memory) .

The output from NMON, vmstat show a high run queue (60+) for continous periods of time intervals, but NO paging, relatively low I/o (6000) , CPU % is 40, Low network.

The only indicators are the high number of syscalls being made. Any thoughts would be appreciated

Published at LXer:

Performance of your database server is directly tied to how well the underlying operating system is working, and there the performance is driven by the hardware you're using.

I am neither a DBA nor an AIX spcialist. We are running Oralce 11G on P5, AIX5.3. Per Oracle reports we are using 16 CPUs and 8 cores. However when I am looking at nmon report I find the cpu utilization is not load balanced.

How can I benchmark the performance of a particular software not complete system? I know various tools are available for system benchmarking.