[Gems-users] Some Problems about the MOESI_directory cache coherence protocol

[sheng ma <mashnudt@xxxxxxxxx>]

Hi, I am a newer to the GEMS simulator. I am interested in the MOESI_directory cache coherence protocol. I have several questions about the implementation codes.

1. When I reading the MOESI_directory-cache.sm file, I noticed there are some words like "GetX", "GetS" and "PUT", and I am wondering what is the particular meaning of these words? 

"GETS" = "GET shared"?? "GETX" = "GET exclusived"?? I am not sure about it, especially what is the particular meaning of "PUT"?

2. Because I am not very familiar with the MOESI_directory protocol, I want to know which kind of message will be sent to multiple destinations? I know the invalidate message maybe needed to send to multiple destinations. But I am not sure whether there are still other message types need to send to multiple destinations? 

3. Whether the invalidation message are always forwarded by the directory node? 

Thank you!