[Gllug] Constrained virtual machines

[john at sinodun.org.uk]

> On Thu, Nov 30, 2006 at 03:05:11PM +0000, Richard Huxton wrote:
>> Is anyone using VM technology that provides limits on CPU and I/O as
>> well as memory usage?
>
> Be aware that disk performance under any VM I've seen sucks compared
> to the real hardware ...  So if you're testing a database, where disk
> I/O performance really matters, it's not clear the test will be fair.

As a counter example, the PC emulator on the Archimedes used to clock disk
access something like 25 times as fast as a native PC could manage at the
time.  This was because the ARM was fast enough to read the disc
continually, at a time when the Intel family still needed to use
interleave to keep up.

Not really relevant nowadays I suppose.  :-)

John

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