slow "stg push" on NFS

[Chuck Lever <cel@citi.umich.edu>]

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hi catalin-

still looking at this problem.

thanks to the several recent patches that add fast-forward support, CPU 
utilization seems to no longer be a problem in general.  what appears to 
be happening is that each push operation deletes and recreates 
everything in the working directory.

for shared file systems, creating and deleting files will always be 
synchronous.  anything we can do to eliminate the need for deleting and 
recreating files that are not changed by a commit would be great.

(i've also noticed that an "stg pop / stg push" sequence causes 'make' 
to rebuild everything -- possibly due to the same reason?)

am i all wet here?

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