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Source of Time Returned by VMGuestLib_GetElapsedMS in a VMware Guest

Details

Does the VMGuestLib_GetElapsedMs function return elapsed time based on a timer on the guest (which means it can fall behind and catch up) or based on a timer on the host (which means its rate should remain constant)?

Solution

The VMGuestLib_GetElapsedMs function, when it is being used in a VMware guest, returns elapsed time based on a timer on the host (so its rate should remain constant).  It returns the virtual machine's uptime in milliseconds, using a constant, non-varying vmkernel time source. The timer  does not fall behind, then catch up.
 
Remember, though, that calling into VMGuestLib has somewhat more overhead than reading a timer local to the guest. Check that you are not calling VMGuestLib so frequently that it negatively affects the performance of your application .

Keywords

Virtual Center, SDK, VI Perl Toolkit, ESX

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  • KB Article: 1002901
  • Updated: Aug 14, 2009
  • Products:
    VMware Infrastructure SDK
  • Product Versions:
    VMware Infrastructure SDK 2.0.x