1. Download nmon.
Choose to download the corresponding version according to the type of CPU:
http://nmon.sourceforge.net/pmwiki.php?n=Site.Download
wget http://sourceforge.net/projects/nmon/files/download/nmon_x86_12a.zip/ download
二.初始化nmon工具。
#unzip nmon_x86_12a.zip
Archive: nmon_x86_12a.zip
inflating: nmon_x86_rhel45
inflating: nmon_x86_rhel52
inflating: nmon_x86_sles9
inflating: nmon_x86_sles10
inflating: nmon_x86_ubuntu810
inflating: nmon_x86_fedora10
inflating: nmon_x86_opensuse10
According to different platforms, initialize the nmon tool of the corresponding platform:
chmod +x nmon_x86_ubuntu810
mv nmon_x86_ubuntu810 /usr/local/bin/nmon
For Debian also do the following (works without it):
apt-get install lsb-release
lsb_release -d | sed 's/Description:\t//' > /etc/debian_release
Then run nmon directly. Running nmon directly can monitor the usage of system resources in real time. Perform the following steps to display a report on system resource consumption for a period of time .
The following is a screenshot of the real-time monitoring of system resource consumption by directly executing the nmon command: 
The consumption of CPU, memory, disk and network is displayed intuitively.
3. Generate nmon report.
1). Collect data:
#nmon -s10 -c60 -f -m /home/
Parameter explanation:
-s10 Collect data every 10 seconds.
-c60 Collect 60 times, that is, collect ten minutes of data.
-f Generated data file names include the time the file was created.
-m The storage directory of the generated data files.
This will generate an nmon file and update it every ten seconds until ten minutes later.
The generated file name is: _090824_1306.nmon, "" is the host name of this host.
nmon -h查看更多帮助信息。
2).生成报表：
下载 nmon analyser (生成性能报告的免费工具)：
https://www.ibm.com/developerworks/community/wikis/home?lang=en#!/wiki/Power%20Systems/page/nmon_analyser
将之前生成的 nmon 数据文件传到 Windows 机器上，用 Excel 打开分析工具 nmon analyser v33C.xls 。点击 Excel 文件中的 "Analyze nmon data" 按钮，选择 nmon 数据文件，这样就会生成一个分析后的结果文件： hostname_090824_1306.nmon.xls ，用 Excel 打开生成的文件就可以看到结果了。
如果宏不能运行，需要做以下操作：
工具 -> 宏 -> 安全性 -> 中，然后再打开文件并允许运行宏。
下面是在测试环境中生成的NMON报告截图：
红色区域为不同指标的分析报告。
3).自动按天采集数据：
在 crontab 中增加一条记录：
0 0 * * * root nmon -s300 -c288 -f -m /home/ > /dev/null 2>&1
300*288=86400 秒，正好是一天的数据。
参考文章：
nmon 性能：分析 AIX 和 Linux 性能的免费工具：
http://www.ibm.com/developerworks/cn/aix/library/analyze_aix/index.html
nmon analyser —— 生成 AIX 性能报告的免费工具：
http://www.ibm.com/developerworks/cn/aix/library/nmon_analyser/index.html