https://community.intel.com/t5/Software-Tuning-Performance/How-to-know-the-exact-cache-associative-on-processor/m-p/775410#M246 Hi, all<BR /><BR />How to get the exact associative pattern of each cache level? <BR />For example, the cache associative of Xeon 5650 processor at different cache level. I have tried to find out that information, but I failed. <BR /><BR />Thank you in advance! Wed, 01 Aug 2012 12:29:30 GMT zhangyihere 2012-08-01T12:29:30Z https://community.intel.com/t5/Software-Tuning-Performance/How-to-know-the-exact-cache-associative-on-processor/m-p/775410#M246 Hi, all<BR /><BR />How to get the exact associative pattern of each cache level? <BR />For example, the cache associative of Xeon 5650 processor at different cache level. I have tried to find out that information, but I failed. <BR /><BR />Thank you in advance! Wed, 01 Aug 2012 12:29:30 GMT https://community.intel.com/t5/Software-Tuning-Performance/How-to-know-the-exact-cache-associative-on-processor/m-p/775410#M246 zhangyihere 2012-08-01T12:29:30Z https://community.intel.com/t5/Software-Tuning-Performance/How-to-know-the-exact-cache-associative-on-processor/m-p/775411#M247 <DIV id="tiny_quote"><DIV style="margin-left: 2px; margin-right: 2px;">Quoting <A jquery1343963370546="60" rel="/en-us/services/profile/quick_profile.php?is_paid=&amp;user_id=328639" href="https://community.intel.com/en-us/profile/328639/" class="basic">zhangyihere</A></DIV><DIV style="background-color: #e5e5e5; margin-left: 2px; margin-right: 2px; border: 1px inset; padding: 5px;"><I>...How to get the exact associative pattern of each cache level?..</I></DIV><BR />Did you try Intel<STRONG>CPUID</STRONG> instruction? Here is an example with intrinsic <STRONG>__cpuid</STRONG> function:<BR />[cpp] ... __cpuid( CPUInfo, 0x80000000 ); // Get the number of valid Extended IDs nExIds = ( RTuint )CPUInfo[0]; CrtMemset( CPUBrandString, 0x0, sizeof( CPUBrandString ) ); for( i = 0x80000000; i &lt;= nExIds; ++i ) // Get the information associated with each extended ID { __cpuid( CPUInfo, i ); CrtPrintf( RTU("Extended Function CPUID Information %xn"), i ); CrtPrintf( RTU("tCPUInfo[0] = 0x%08Xn"), CPUInfo[0] ); CrtPrintf( RTU("tCPUInfo[1] = 0x%08Xn"), CPUInfo[1] ); CrtPrintf( RTU("tCPUInfo[2] = 0x%08Xn"), CPUInfo[2] ); CrtPrintf( RTU("tCPUInfo[3] = 0x%08Xn"), CPUInfo[3] ); // Process CPU brand String and Cache information if( i == 0x80000002 ) CrtMemcpy( CPUBrandString, CPUInfo, sizeof( CPUInfo ) ); else if( i == 0x80000003 ) CrtMemcpy( CPUBrandString + 16, CPUInfo, sizeof( CPUInfo ) ); else if( i == 0x80000004 ) CrtMemcpy( CPUBrandString + 32, CPUInfo, sizeof( CPUInfo ) ); else if( i == 0x80000006 ) { nCacheLineSize = CPUInfo[2] &amp; 0xff; nL2Associativity = ( CPUInfo[2] &gt;&gt; 12 ) &amp; 0xf; nCacheSizeK = ( CPUInfo[2] &gt;&gt; 16 ) &amp; 0xffff; } } ... if( nExIds &gt;= 0x80000006 ) { CrtPrintf( RTU("tCache Line Size = %ldn"), nCacheLineSize ); CrtPrintf( RTU("tL2 Associativity = %ldn"), nL2Associativity ); CrtPrintf( RTU("tCache Size = %ldKn"), nCacheSizeK ); } ... [/cpp]<BR />Output shouldlook like:<BR /><BR /> ...<BR /> Cache Line Size = ...<BR /> L2 Associativity = ...<BR /> Cache Size = ...K<BR /> ...</DIV> Fri, 03 Aug 2012 03:20:53 GMT https://community.intel.com/t5/Software-Tuning-Performance/How-to-know-the-exact-cache-associative-on-processor/m-p/775411#M247 SergeyKostrov 2012-08-03T03:20:53Z https://community.intel.com/t5/Software-Tuning-Performance/How-to-know-the-exact-cache-associative-on-processor/m-p/775412#M248 I would also recommend to use Windbg in its kernel mode as primary source of memory and CPU inspection tool. Regarding CPU the most valuable information is contained in PCR and PCRB structures.You can dump these structures with the !pcr command use dt nt!_KPCR [address of PCR] -b -v -r. Sat, 22 Dec 2012 09:06:34 GMT https://community.intel.com/t5/Software-Tuning-Performance/How-to-know-the-exact-cache-associative-on-processor/m-p/775412#M248 Bernard 2012-12-22T09:06:34Z