Re: [Gems-users] Is the Cache tag search behavior truely simulated in ruby cache?

[Dan Gibson <degibson@xxxxxxxx>]

Your cout statement follows the return statement. Hence it is never executed. Thats why the function appears to always return -1.

Regards,

Dan

2010/5/10 Dan Gibson <gibson@xxxxxxxxxxx>

Your cout statement follows the return statement. Hence it is never executed. Thats why the function appears to always return -1.

Regards,

Dan

2010/5/10 MaDafan <dafan_ma@xxxxxxxxxxx>

Hi there,
To do some research works on the cache replacement strategy in ruby cache, I choose several protocol for simulation, and I use the Cachememory::findTaginSet to profile the miss and hit in Cache rather than profile them in Slicc file, but I find the function “findTaginSet” always returning value "-1" which means no tag matching in sets.I'm confused so I add a line in Cachememory.h:

template<class ENTRY>
inline
int CacheMemory<ENTRY>::findTagInSet(Index cacheSet, const Address& tag) const
{
  assert(tag == line_address(tag));
  // search the set for the tags
  for (int i=0; i < m_cache_assoc; i++) {
    if ((m_cache[cacheSet][i].m_Address == tag) &&
        (m_cache[cacheSet][i].m_Permission != AccessPermission_NotPresent)) {
      return i;
   cout<<"L2 hit!"<<i<<endl;
&nb! sp;   }
  }
  return -1; // Not found
}

but nothing shows on the screen, so I wonder is the function a dummy one, actually no real address tag is stored in ruby cache, and the ruby can only profile miss and hit depending on the state, is it the case?
Thx !

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