Re: [Gems-users] Efficiency of L2 cache

[Byn Choi <bynchoi1@xxxxxxxxxxxx>]

Hi,

I'm no expert in GEMS - just played around with ruby for a while - so this may not be the best way to go about doing this.

I'd add a function in CacheMemory.h that takes the Address of the line and its purpose is to trigger timestamping. It should be easier to do it in CacheMemory.h because you'd want to use  g_eventQueue_ptr->getTime() to get the current ruby cycle.

The other half of the implementation would be in -L2cache.sm.

1. an additional timestamp field in L2Entry structure.

2. in transitions that are triggered by the event that you are interested in studying - LD/ST, etc, call the action whose definition calls the above mentioned timestamping function inside CacheMemory.h. For this, don't forget to add the function signature in the "external_type" construct in the .sm file.

As for the last question, I believe it is called when you do 

simics> ruby0.dump-stats 

Personally, I find that the best way to go about finding out about things like this is to use "fgrep -d recurse" or Ctags, etc.

Byn

On Feb 15, 2010, at 7:28 PM, Muhammad Shoaib wrote:

Hi list,

i am trying to study the efficiency of L2 cache (active blocks count) in a CMP system. For this i need to declare a array or structure which will record the time between two consecutive hits (for each cache line) but I am not sure where i should make the modification should be it in the -L2cache.sim or CacheMemory.h. Any suggestions on that?

And one general question about CacheMemory.h, there is a printConfig function there, its output is in the dump file after the simulation. But from it is being called ?

Muhammad

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