Re: [Gems-users] Processor0 and MOESI_SMP_Directory Protocol

[Kevin Moore <kmoore@xxxxxxxxxxx>]

James,
	You can see the directory transition rules in 
MOESI_SMP_LogTM_directory-dir.sm.  MMO is a busy state, which means 
that the directory is waiting for an unblock message.
--Kevin

On Apr 20, 2007, at 12:43 AM, James Wang wrote:

> Hi All:
>     I modified a MOESI_SMP_Directory protocol to
> simulate a transactional memory cache coherent
> protocol. It works fine most of the time but sometimes
> it will just hand for no obvious reason.
>     One interesting phenomenon that we observe is that
> sometimes when P0 write to a highly contended
> variable, the directory would be constantly retrying
> for a particular kind of event.(GETS,MMO>MMO for every
> 3 ruby cycles) After a long time, it will eventually
> get out of it but sometimes it doesn't. But this
> situation never applies to other processors. Is there
> any reason that the directory would do that?
>      Thanks in advance for any suggestion!
>
> Regards
> James
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