[Xen-devel] Re: ocaml?? why??

[John Levon <levon@xxxxxxxxxxxxxxxxx>]

On Mon, Apr 06, 2009 at 04:08:30PM +0100, Vincent Hanquez wrote:

> >>with advanced transaction merging capability in the C version would have 
> >>been a major pain, compared to how (almost) easy it was in OCaml.
> >
> >So, I'm interested: why?
> >  
> The initial reason was getting rid of the on-disk database that also 
> work as the mechanism for transaction  merging (a language with a GC is 

Whilst I agree that xenstored's  transaction-via-cp is incredibly gross,
you can get most of the benefit with a two-line patch to move it onto
tmpfs (as we have done for quite some time).

> same thing that the ocaml code does become trivial in C. either you need 
> to modify every operation to understand some kind of modification list 
> so that the tree get modified only at commit time (compare to now, at 
> every operations)

Well exactly. It's hot air since I haven't actually written it, but a
modification list doesn't seem particularly complex to me.

regards
john

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