Re: [Gems-users] Multicast in GEMS 1.4

["Niket Agarwal (niketa@xxxxxxxxxxxxx)" <niketa@xxxxxxxxxxxxx>]

A multicast message in gems 1.4 is not split into multiple unicasts. 

A multicast message travels along as a single message, splitting as and when divergent paths are to be taken for different destinations. 

Niket

----- Original Message -----
From: Marco Solinas <marco.solinas@xxxxxxxxxxxx>
Date: Thursday, September 4, 2008 6:17 am
Subject: [Gems-users]  Multicast in GEMS 1.4
To: Gems Users <gems-users@xxxxxxxxxxx>

> Dear List,
> 
> I was wandering about how GEMS (v 1.4) manages multicast 
> communication 
> (when the NetDest of an outgoing message contains more than one 
> destination node of the system: for example, in case of an 
> Invalidation 
> message sent to many -say, N- sharers in a MESI coherence protocol).
> Is this message split in N unicast messages when leaving the sender 
> node 
> output buffer? Or, is it sent as is to ALL the destination? Or, is 
> it 
> split when needed, depending on the relative position of 
> destination 
> nodes with respect to both the sender and the communication 
> infrastructure?
> Thanks a lot for your support.
> Regards
> Marco
> 
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