Re: [Gems-users] latency parameters in MOESI_SMP_directory protocol

[Niket Agarwal <niketa@xxxxxxxxxxxxx>]

 

Here the directory latency is set to 10 cycles and DIRECTORY_LATENCY parameter in rubyconfig.defaults is set to 80. So, what would be the actual directory latency observed here from core0 to directory0? Also, are directories stored in the main memory?

For SMP_directory protocols, the directory is stored in the memory by default. The latency of access from core to directory = network delay + directory latency. In the above configuration, core0 to directory0 no contention latency = 1 cycle to get into Network interface + 1 cycle in Network Interface + 1 cycle in link to router + 4 cycle in router + 1 cycle in link to Network interface of directory + 1 cycle in network interface + 1 cycle to directory + directory latency.
 

Thanks in advance for any insights,

Ed



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