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

[MaDafan <dafan_ma@xxxxxxxxxxx>]

...well...
Thank you, Dan.
Another question,plz
After I warm up the cache for a while, I issue ruby0.dump-cache, these messages show up, why all of entry state are "I"? should I turn on the "ruby0.setparam DATA_BLOCK" or somthing?

  Index: 65529 way: 3 entry: [L2Cache_Entry: CacheState=I Dirty=0 Tokens=0 DataBlk=] ]
  Index: 65530 way: 0 entry: [L2Cache_Entry: CacheState=I Dirty=0 Tokens=0 DataBlk=] ]
  Index: 65530 way: 1 entry: [L2Cache_Entry: CacheState=I Dirty=0 Tokens=0 DataBlk=] ]
  Index: 65530 way: 2 entry: [L2Cache_Entry: CacheState=I Dirty=0 Tokens=0 DataBlk=] ]
  Index: 65530 way: 3 entry: [L2Cache_Entry: CacheState=I Dirty=0 Tokens=0 DataBlk=] ]
  Index: 65531 way: 0 entry: [L2Cache_Entry: CacheState=I Dirty=0 Tokens=0 DataBlk=] ]
  Index: 65531 way: 1 entry: [L2Cache_Entry: CacheState=I Dirty=0 Tokens=0 DataBlk=] ]
  Index: 65531 way: 2 entry: [L2Cache_Entry: CacheState=I Dirty=0 Tokens! =0 DataBlk=] ]
  Index: 65531 way: 3 entry: [L2Cache_Entry: CacheState=I Dirty=0 Tokens=0 DataBlk=] ]
  Index: 65532 way: 0 entry: [L2Cache_Entry: CacheState=I Dirty=0 Tokens=0 DataBlk=] ]
  Index: 65532 way: 1 entry: [L2Cache_Entry: CacheState=I Dirty=0 Tokens=0 DataBlk=] ]
  Index: 65532 way: 2 entry: [L2Cache_Entry: CacheState=I Dirty=0 Tokens=0 DataBlk=] ]
  Index: 65532 way: 3 entry: [L2Cache_Entry: CacheState=I Dirty=0 Tokens=0 DataBlk=] ]
  Index: 65533 way: 0 entry: [L2Cache_Entry: CacheState=I Dirty=0 Tokens=0 DataBlk=] ]
  Index: 65533 way: 1 entry: [L2Cache_Entry: CacheState=I Dirty=0 Tokens=0 DataBlk=] ]
  Index: 65533 way: 2 entry: [L2Cache_Entry: CacheState=I Dirty=0 Tokens=0 DataBlk=] ]
  Index: 65533 way: 3 entry: [L2Cache_Entry: CacheState=I Dirty=0 Tokens=0 DataBlk=] ]
  Index: 65534 way: 0 entry: [L2Cache_Entry: CacheState=I Dirty=0 Tokens=0 DataBlk=] ]
  Index: 65534 ! way: 1 entry: [L2Cache_Entry: CacheState=I Dirty=0 Tokens=0 DataBlk=] ]
  Index: 65534 way: 2 entry: [L2Cache_Entry: CacheState=I Dirty=0 Tokens=0 DataBlk=] ]
  Index: 65534 way: 3 entry: [L2Cache_Entry: CacheState=I Dirty=0 Tokens=0 DataBlk=] ]
  Index: 65535 way: 0 entry: [L2Cache_Entry: CacheState=I Dirty=0 Tokens=0 DataBlk=] ]
  Index: 65535 way: 1 entry: [L2Cache_Entry: CacheState=I Dirty=0 Tokens=0 DataBlk=] ]
  Index: 65535 way: 2 entry: [L2Cache_Entry: CacheState=I Dirty=0 Tokens=0 DataBlk=] ]
  Index: 65535 way: 3 entry: [L2Cache_Entry: CacheState=I Dirty=0 Tokens=0 DataBlk=] ]

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Date: Mon, 10 May 2010 07:42:14 -0600
From: degibson@xxxxxxxx
To: gems-users@xxxxxxxxxxx
Subject: Re: [Gems-users] Is the Cache tag search behavior truely simulated in ruby cache?

Your cout statement follows the return statement. Hence it is never execute! d. 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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