Version of gmake for clusters...

lowther at att.net lowther at att.net
Thu Apr 12 07:08:40 EDT 2001


Andreas Boklund wrote:
> 
> -----------------------------------------------------
> Number of         time          Did they fill the
> computers       minutes         head's NIC
> 1               5.58            no
> 3               2.59            no
> 5               3.30            yes
> 7               3.10            yes
> 9               2.30            yes
> -----------------------------------------------------
> If anyone have any ideas on why the numbers are so irregular,
> i would like to hear your theories.
> 

It would appear as if your network was the bottle neck if by "Did they
fill the head's NIC" means you were utilizing full bandwidth.  You can
add 1+1 9 times much faster on one processor than trying to push it out
as sub processes to 9 machines.  The processor overhead is much less
than the network overhead.

-- 
Ken Lowther
Youngstown, Ohio
http://www.atmsite.org

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