If your vps does not come with swap, you can easily add swap to centos 7 following this guide: https://www.digitalocean.com/community/tutorials/how-to-add-swap-on-centos-7
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Tag: CentOS7
Download ioping-1.1-1.el7.x86_64.rpm (ioping for CentOS 7):
https://rpmfind.net/linux/epel/7/x86_64/Packages/i/ioping-1.1-1.el7.x86_64.rpm
Download ioping for CentOS 7
CentOS7 ioping rpm download