Re: Proposal for Remote Execution

[Jim MacArthur <jim macarthur codethink co uk>]

On 11/05/18 09:32, Jürg Billeter wrote:
> On Thu, 2018-05-10 at 15:31 +0100, Jim MacArthur wrote:
> > It seems to me that the existing filesystem-based system could just run
> > through our CAS-FUSE when we implement that. I can't think of any
> > particular reason that would be slow, although it'd be worth testing
> > when we have it. If that does turn out to be a viable option, doesn't
> > that make the CAS-backed virtual directory implementation (and in fact
> > the whole virtual directory system) redundant?
> Staging build dependencies and sources will be much faster with the
> CAS-backed virtual directory system. You can virtually import/copy a
> directory tree with thousands of files with a single Merkle tree
> manipulation. Via FUSE you'd still need a syscall for every file and
> that syscall would in turn require a context switch on the FUSE
> implementation as well, i.e., it would be even slower than the current
> staging using the local filesystem.
>
> Jürg
Wouldn't the move or copy of a directory via the FUSE map to such a 
single operation?