In older versions of Xemn, each DomU could effectively use the system time of the Dom0. That was remove after Xen 4 or so. In versions after that issues of clock drift need to be addressed. I was investigating this and came across a discussion of best practices about setting the Limux clocksource on DomU’s. It seems there has been some performance issues with using “xen” and a recommendation to use “tsc” but it’s not entirely straightforward.
Let’s suppose one is tasked with a complex set of calculations where the input data loads from a database and the output data saves to a database. This has come up a number of times in my consulting work. There are 2 approaches:
This latter has the obvious benefits of skipping the data transfer times. This is also where it’s easy to use the first approach, only to run into problems as the amount of data is increased.