Test SWAP impact
Methodology
I will prepare two virtual servers with the same installation and configuration. Next I will try to compile Nagios with empty memory, we will measure with time command the compilation time. Next I will try to compile Nagios with full memory in different server, to get memory full we will use stress command. We will measure swap in and swap out with several tools.
I will mantain both virtual machines on.
Both machines will have the next configuration:
- Centos 7.6
- 1G RAM, 1G SWAP
- 11G HDD
- Linux Kernel 3.10.0-957.27.2
- gcc 4.8.5-36
- stress 1.0.4-16
- Nagios 4.4.5
- 1 vCPU
Nagios compilation compilation will be:
time make all
Prepare environment
useradd nagios groupadd nagcmd usermod -a -G nagcmd nagios usermod -a -G nagcmd apache yum install epel-release httpd php php-cli gcc unzip wget glibc glibc-common gd gd-devel net-snmp yum install stress cd /root wget https://github.com/NagiosEnterprises/nagioscore/releases/download/nagios-4.4.5/nagios-4.4.5.tar.gz tar -zxvf nagios-4.4.5.tar.gz