Re: Do we really need virtual machines?

Joan Pujol <joanpujol@gmail.com> writes:
|> On 2 Oct 2004 16:35:11 -0400, Jürgen Kahrs <juergen.kahrs@vr-web.de> wrote:
|>
|> > Has anyone ever noticed that the "standard libraries" that come with
|> > Java and C# are attempts to recreate Unix-like Operating Systems ?
|>
|> Yes, this is true. But I think that this attempts are very useful.


For some meanings of the word "useful". Unfortunately, they also
attempt to implement every restriction of those languages, such as:


A minimal (and often useless) diagnostic model - no, a single integer
code is NOT useful in practice. When you get ENOMEM from a write to a
descriptor that is connected via TCP/IP to a remote server, what have
you run out of and in what part of the system?


A synchronous, copying I/O model that gives really poor efficiency
(and I don't just mean bandwidth). Many of the old mainframe models
were vastly better, and we used to get very high bandwidths with very
low memory and CPU utilisation on very slow CPUs.


There are other examples, but that should do.




Regards,
Nick Maclaren.

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