No one...any clarification on this will be well-appreciated.
Paolo
Il 20/07/2011 13:02, Paolo Grani ha scritto:
Hi all,
i' m studying Ruby and the MOESI_CMP_directory coherence protocol with
a Mesh topology of interconnection.
I' ve two quick questions.
1) To correctly run a simulation with a Mesh topology i need to set
the number of L2 caches ( num-l2caches option ) and directories (
num-dirs option ) equal to the
number of simulated cores. Is this ok?
2) I know that the MOESI_CMP_directory models a two-level cache
hierarchy but i would like to know if the L2 cache is shared between
all cores or if is private for each
core.
In the config.ini output file i can see that an L2 cache object is
created for each core and the dimension of this cache is, by default,
2MB.
In the gems web site i read that "CMP protocols assume each node
consists of processors with their private L1 caches, and a banked,
shared L2 cache."
2a) First i would like to know if the cache is private for each
core or if it is shared between all cores.
2b) If it is shared i would like to know if is shared and banked (
2MB is the total size of this cache that is splitted in bank of 2MB /
num_cpus each ) or if each bank is
2MB and so the total L2 cache size is 2MB * num_cpus.
Best wishes,
Paolo
--
====================================================
The devil is in the details
====================================================
Ing. Paolo Grani
Dipartimento di Ingegneria dell'Informazione
via Roma 56, 53100 Siena, Italia
Laboratorio di Architettura dei Calcolatori ---> int. 223
mailto:gr...@dii.unisi.it
http://www.dii.unisi.it
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