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Re: Program instantiation (was: Re: Translucent storage: design, pros, a

From: Marcus Brinkmann
Subject: Re: Program instantiation (was: Re: Translucent storage: design, pros, and cons
Date: Mon, 15 Jan 2007 09:42:44 +0100
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At Sun, 14 Jan 2007 07:21:38 -0500,
"Jonathan S. Shapiro" <address@hidden> wrote:
> On Fri, 2007-01-12 at 20:23 +0100, Marcus Brinkmann wrote:
> > This is an example were "transparent access" to the storage not just
> > means inspectability, but intimate knowledge about its structure.  If
> > you want to leverage the flexibility illustrated by the above
> > examples.  the algorithms to make use of this must be standardized and
> > exist outside of the bundle itself.
> > If that is a goal, then it seems not to make much sense to have the
> > algorithms twice, once in the bundle and once outside.
> This is complete nonsense. The algorithm for strlen() is well known. It
> still makes sense to have it in a common place: libc.
> In the same way, the constructor algorithm is well known and can be
> reproduced by anyone.
> In the presence of translucency, there is still an argument for a
> constructor: things that run in separate processes are less
> failure-prone than things that run in libraries.
> The great weakness of libraries is that they share address spaces with
> their host application. This makes each vulnerable to flaws in the
> other. Purely from an engineering perspective, it is sensible to make
> the functionality of each process as small as it can be made while still
> achieving acceptable performance.
> Libraries are a tool that you should only reach for when the performance
> cost of engineerability becomes prohibitive.

You are conflating separate issues.  If you want address space
separation, then there is no reason why the C library can not spawn
arbitrary helper processes to execute the algorithms desired by the
user.  I leave open the question for now if this makes sense in this
case or not.

Either way it still makes sense to only pass around directories, not
full blown constructors.


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