[mpich-discuss] ring communication and other questions

[Dave Goodell]

Don't use mpd, use hydra:

http://wiki.mcs.anl.gov/mpich2/index.php/Frequently_Asked_Questions#Q:_I_don.27t_like_.3CWHATEVER.3E_about_mpd.2C_or_I.27m_having_a_problem_with_mpdboot.2C_can_you_fix_it.3F

-Dave

On Mar 6, 2011, at 2:49 PM CST, hatem Elshazly wrote:

> hey there guys,
> i hope u all are doing great.
> 
> i had some questions in mind and thought any one here could have the answers.
> 
> 1.why mpich uses ring communication? why not tree or star or any other network topology?
> 
> 2.when u use mpd as your process manager, and u have a mpd.hosts file like this:
>   node1
>   node2
>   node3
> when u have any problems booting the mpd in (say node2) the mpd doesn't skip this node and continue to the next(instead the whole booting process fails)?
> does this issue happens with other process managers (say hydra)?
> 
> one last thing, if any one know anything that can give me deeper knowledge about how mpich2 internally works it would be great.
> 
> sorry for the long mail.
> thanks
> hatem 
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