Re: NFS--mounted builddirs and detecting clock skew

[Bob Friesenhahn]

On Thu, 22 Nov 2007, Harlan Stenn wrote:
> > All of these problems are possible.  Some issues are seen by GNU make
> > and others are not.
>
> I *think* I'd be happy with 'clock skew in the build directory'.

 You mean like


  CPU -- NFS (Sources + Objects)


or

       NFS1 (Sources)
     /
  CPU
     \
       NFS2 (Built Objects)

or

       Local Disk (Sources)
     /
  CPU
     \
       NFS2 (Built Objects)

or

       NFS1 (Sources)
     /
  CPU
     \
       Local Disk (Built Objects)

I use the last one quite often these days but sometimes I use the 
first.

> > When my clocks are a bit off I have noticed that
> > GNU make sometimes intermittently complains due to the "wandering
> > clock" problem.
>
> I don't see 'wander' (case insensitive) in either the gmake 3.81 or
> 3.79.1 source trees.

What I mean is that the condition is borderline detectable so 
sometimes it is detected and other times not.

Bob
======================================
Bob Friesenhahn
address@hidden, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/