My (small) company uses an out-of-date linux (centos) software stack to run a proprietary software on a small cluster. Understandingly, IT is reluctant to upgrade since everything works now.
I'd like to do some performance tests on these machines and plan to install a lot of software that shouldn't interfere with the production root. It also includes compiling scientific packages and therefor I need up-to-date libraries. One possiblity is to install an entire up-to-date root in a different location and
chroot into it.
My question is: How will this impact the performance of the tools running inside the chroot? Are there any benchmark references available? Is this technique widespread/disadvantegous/dangerous? Other ideas? See also my related question.