I got strange error messages in the OS X system.log like:
process prl_vm_app caught causing excessive wakeups. Observed wakeups rate (per sec): 204; Maximum permitted wakeups rate (per sec): 150; Observation period: 300 seconds; Task lifetime number of wakeups: 11490631 ReportCrash: Invoking spindump for pid=1118 wakeups_rate=554 duration=82 because of excessive wakeups spindump: Saved wakeups_resource.diag report for prl_vm_app version 10.1.0 (28600) to /Library/Logs/DiagnosticReports/prl_vm_app_2014-10-24-140159_nsk-reserve01-mbp.wakeups_resource.diag
You can also see a lot of files like:
*.cpu_resource.spin appearing in /Library/Logs/DiagnosticReports/ folder.
These are the diagnostic messages generated by the OS X that do not affect the performance of your Mac or the virtual machine and thus can be ignored.