Re: [Gems-users] block events in MOESI SMP directory protocol

["Mike Marty" <mike.marty@xxxxxxxxx>]

The protocol uses blocking directories to manage races.  When a request reaches a directory, it generates a forward/invalidates and enters a blocking transient state.  When the requestor completes, it sends an unblock message to the directory.  If a subsequent request reaches the directory when blocked, it buffers until unblocked.

The max number of sharers for  a cache line is the number of processors in the system.

--Mike

On Dec 15, 2007 6:32 AM, <nikiforg@xxxxxxxxxx > wrote:

Hi all,

I'm trying to understand how this protocol works and the first of my questions
is how the block events are used, which is their meaning e.t.c. Second which is
the max number of sharers of a cache line in a directory entry (max sharing).

thanx in advace,
Nikiforos.
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