We have a KVM VM running Debian 7 installed from ISO which has been
allocated two cores and 4GB RAM on a modest but lightly loaded host with
one CPU, four 2.4GHz cores and 24GB of RAM (around 10GB free). No other
attributes like CPU cap or share have been changed from their defaults.
This VM runs builds of a rails app under jenkins. Running the same
thing on similar bare metal yields a build time of around 6 minutes.
The VM is coming in at a consistent 13 minutes. The build is local and
does not access any external network resources once it has checked out
the code from git.
Obvioulsy, I would expect a VM to be slower than bare metal but perhaps
not this slow? The load on the host when the build is running peaks at
around 0.8. Shutting down the other few tiny VMs on the host has little
effect. How do I go about debugging and optimising the performance?
Thanks in advance,
Matt.
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