[Gems-users] Ruby profiler

[李 建樟 <piliman9176@xxxxxxxxxxx>]

Hi all,
        
         If I want to add some code to calculate false sharing miss, I need some information
 
         about processor access address of cache line, and other processor write or read this
 
         address of cache line.  Are there some these information that by calling existing 
 
         function could be obtained ? 
 
         In ruby/slicc_interface/RubySlicc_Profiler_interface.C, there is a function
 
         void profile_sharing(const Address& addr, AccessType type, NodeID requestor, const Set& sharers, const Set& owner)
 
         but I do not know what these parameters represent the meanning.
 
         and I run the simulation using splash-2 benchmark on GEMS, but the output
 
         the sharing miss always is zero.  what's wrong ?  Is it associated protocol ? MOSI_SMP_bcast or MSI_MOSI_CMP_directory or else ?
---------------------------------------------------------------------------------------------------------------------
         AddressProfiler Stats
 
         sharing_misses: 0
         getx_sharing_histogram: [binsize: 1 max: 0 count: 0 average: NaN |standard deviation: NaN | 0 ]
         gets_sharing_histogram: [binsize: 1 max: 0 count: 0 average: NaN |standard deviation: NaN | 0 ]
 
---------------------------------------------------------------------------------------------------------------------
 
         I turn on the parameters  PROFILE_HOT_LINES: true and PROFILE_ALL_INSTRUCTIONS: true
 
         but in ruby/profiler/Profiler.C
 
         Profiler::addAddressTraceSample(const CacheMsg& msg, NodeID id) {
              ...
            m_address_profiler_ptr->addTraceSample(msg.getAddress(), msg.getProgramCounter(), msg.getType(), msg.getAccessMode(), id, false);
         }
        
         the last argument always false, so the following function that if statement can't step in, is it a bug ?
                  
         void AddressProfiler::addTraceSample(Address data_addr, Address pc_addr, CacheRequestType type, AccessModeType access_mode, NodeID id, bool sharing_miss)
         {
               if (PROFILE_HOT_LINES) {
                   if (sharing_miss) {
                        m_sharing_miss_counter++;
                  }
              }
             ...
          }
       
          If someone knows it , please help me.
 
         Thanks a lot for you help in advance.
 
Mr. Li