RE: [SSI-users] Re[3]:I-users] Re: clusternandel as openssi demo

SourceForge Headquarters 225 Broadway Suite 1600 San Diego, CA 92101 +1 (858) 454-5900

On Tue, 2005-03-15 at 20:27 -0800, Walker, Bruce J wrote:
> > 
> > Right,  BUT each node that calculates part of the fractal has 
> > it own "shared" data segment. That shared
> > data segement is read (and deleted) by the program that 
> > displays the fractal. (a flag in the shared data
> > segment is set when the "slave" is done. There are never 
> > multiple processes writing to the same data
> > segment.
> 
> How does the reader know the writer is done?  If he is "loooking" for
> the slave to set the bit, that looking could be expensive.  If he gets a
> signal or some such, it would less likely to thrash the cache.
> 

Reader busy-loops on the flag variable before beginning to use the
shared data. 

However much before this, reader waits on all children (which fill up
the shared data on different nodes) by doing waitpid.

Regards,
Bharata.

> Bruce
>  
> > 
> > 
> > >Regards,
> > >
> > >Brian
> > 
> > Ron
> > 
> > =================================================================
> > 1879:
> >      Thomas Edison gets an idea, and his brother Timmy says,
> >      "Hey, what's that thing over your head?
> > =================================================================
> >  Ron Croonenberg               | Phone: 1 765 658 4761
> >  Technology Coordinator        | Fax:   1 765 658 4732
> >                                |
> >  Department of ComputerScience | e-mail : ronc@DePauw.edu
> >  DePauw University             |
> >  Julian Science & Math Center  |
> >  602 South College Ave.        |
> >  Greencastle, IN  46135        |
> > =================================================================
> >  http://www.depauw.edu/acad/computer/RonCroonenberg.asp
> > =================================================================
> > 
> > 
> > -------------------------------------------------------
> > SF email is sponsored by - The IT Product Guide
> > Read honest & candid reviews on hundreds of IT Products from 
> > real users.
> > Discover which products truly live up to the hype. Start reading now.
> > http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click
> > _______________________________________________
> > Ssic-linux-users mailing list
> > Ssi...@li...
> > https://lists.sourceforge.net/lists/listinfo/ssic-linux-users
> > 