Re: [Gems-users] Multicast in GEMS 1.4


Date: Fri, 05 Sep 2008 11:53:04 +0200
From: Marco Solinas <marco.solinas@xxxxxxxxxxxx>
Subject: Re: [Gems-users] Multicast in GEMS 1.4
Hi Niket!
Thanks a lot for your support.
Marco

Niket Agarwal (niketa@xxxxxxxxxxxxx) ha scritto:
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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