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Multi-Core Scaling In A KVM Virtualized Environment
It is a similar story with the 7-Zip compression benchmark where the efficiency of the guest begins to deviate from the host when having more than four CPU cores to tap.
The Parallel BZIP2 test did not illustrate this problem and was like the C-Ray results where it scaled very well with the increasing core count.
With the OpenMP-powered GraphicsMagick resizing test, the virtualized guest performance actually dropped when six and twelve cores were enabled.
With the image sharpening operation in GraphicsMagick, at least the performance didn't degrade when going beyond four cores, but it wasn't as fast as the system host.