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| | CPU cache - Wikipedia, the free encyclopedia |
 | | A CPU cache is a cache used by the central processing unit of a computer to reduce the average time to access memory. | | | The first hardware cache used in a computer system was not actually a data or instruction cache, but rather a TLB. | | | These predictors are caches in the sense that they store information that is costly to compute. |
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http://en.wikipedia.org/wiki/CPU_cache
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| | Patent 4370710: Cache memory organization utilizing miss information holding registers to prevent lockup from cache ... |
| | Finally, the cache memory 12 has a data output path 54 connected to the selection unit 56 so that any one of three data input may be selected as an output to the central processing units of a computer system. | | | Because the access time of this cache buffer memory is usually an order of magnitude faster than the main or central computer memory and the standard software practice is to localized data, the effective memory access time is considerably reduced in a computer system in which a cache buffer memory is included. | | | This is referred to as cache memory lockup or input lockout. |
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http://www.freepatentsonline.com/4370710.html
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| | cache miss - BlueRider.com |
| | A request to read from memory which cannot be satisfied from the cache, for which the main memory has to be consulted. |
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http://cache_miss.bluerider.com/wordsearch/cache_miss
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| | Cache |
| | Because of this, I consider cache to be one of the more important topics of computer hardware. | | | The data in cache is the data in cache, and that's all there is to it. | | | A cache miss occurs when the data we're looking for is not in cache, and so we must load it from main memory. |
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http://www.duke.edu/~twf/cps104/cache.html
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| | Reducing Cache Miss Rate |
| | The performance of a two-level cache is calculated in a similar way to the performance for a single level cache. | | | Capacity misses can occur for large matrices since it may not be possible to store all the elements of Z in the cache. | | | The number of misses in the cache divided by the total number of memory accesses to this cache (Miss rateL2 for the 2nd-level cache). |
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http://www.cs.umbc.edu/~plusquel/611/slides/chap5_3.html
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| | Calculating the Cache Hit and Miss Rates |
| | The possibility of getting enough cache hits in equivalent cached operations to actually save disk reads is almost negligible, while the possibility of losing cache hits because of the additional load on the cache is quite significant. | | | So it is possible to have an 85% cache hit rate and a 1% cache miss rate, with the remaining 14% being accounted for by direct reads. | | | This discussion of direct reads leads naturally to the observation that it is really the cache miss rate, rather than the cache hit rate, that should influence your sizing of the database buffer cache. |
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http://www.ixora.com.au/tips/tuning/cache_miss.htm
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| | Cache miss |
| | occurs when a cache line has to be fetched from main memory |
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http://www.eecg.toronto.edu/~jacobsen/courses/icde01/sld115.htm
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| | File Cache Miss Rate Chart |
| | A file cache miss occurs when a read request is for a disk block that is not in the file cache. | | | When a system is lightly loaded, the percentage of misses for data maps and pin reads is higher; thus, the overall file cache miss rate is higher. | | | If your system reports a file cache miss rate of 20% or more for a prolonged period of time, you probably need to increase the file cache size or the system memory so that it can hold more disk blocks. |
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http://www.concord.com/help/files/reports/glance/server/filMiss.html
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| | EFFICIENT CACHE MISS DETECTION TECHNIQUES FOR HIGH PERFORMANCE PROCESSORS |
| | BACKGROUND : Memory caches are useful devices for improving the read/write times to and from main memory of a computer processor. | | | However the size of caches are limited since access times increase with cache size and aggressive processors perform multiple accesses to the caches in a single cycle. | | | The MNM is smaller than the cache structures and can be used for both data and instructions. |
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http://www.research.ucla.edu/tech/ucla03-295.htm
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| | Cachegrind: a cache-miss profiler |
| | The cache configuration simulated (cache size, associativity and line size) is determined automagically using the CPUID instruction. | | | Thus it measures not the number of times the data cache is accessed, but the number of times a data cache miss could occur. | | | Cachegrind is a tool for doing cache simulations and annotating your source line-by-line with the number of cache misses. |
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http://www.lrz-muenchen.de/services/software/programmierung/valgrind/html/cg_main.html
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| | Miss Rate |
| | HAC is space-efficient: it needs only 11% more cache space than the bare minimum to run T1 without cache misses, and it needs only 1% more than the minimum if the number of secondary scan pointers is increased to 23. | | | The overhead for HAC is higher (55%) because most objects in the cache are installed in the indirection table, whereas for FPC it is lower (27%) because only approximately half of the objects in the cache are installed. | | | The difference is due to two problems with GOM's cache management scheme: storage fragmentation and static partitioning of the cache between page and object buffers (which causes space to be wasted by useless objects contained in cached pages). |
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http://www.pmg.lcs.mit.edu/papers/hac-sosp97/node19.html
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| | Cache miss rate |
| | Most of the time is spent in the first two functions, so I wonder if I get a serious performance degradation with the cache misses for the two first functions and also with the level two cache misses of the =operator. | | | Although, the question "how does extreme programming handle optimising routines at the instruction cache level?" might be interesting to this group, I don't think the answers would be of immediate help to you. | | | So my question is: Is it worth considering to optimize the program for cache acces. |
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http://www.codecomments.com/message155995.html
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| | Data Dictionary Cache Miss Per Second Per Cache |
| | The Data Dictionary Cache is the part of the shared pool used to hold definitions of dictionary objects in memory. | | | The Data Dictionary Cache Miss Per Second Per Cache chart shows cache-misses per second for each cache with the data dictionary. | | | When Oracle is first started and objects are being accessed for the first time, a miss occurs because a disk read has been required to access the information. |
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http://www.df.lth.se/~egh/doc/EM/Webhelp/dba/DBA_C18CHT59.HTML
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| | [No title] |
| | Memory Address - 503 Cache Index - 119 Cache Tag - 3 ***************************** Cache Miss! | | | Memory Address - 520 Cache Index - 8 Cache Tag - 4 ***************************** Cache Miss! | | | Memory Address - 517 Cache Index - 5 Cache Tag - 4 ***************************** Cache Miss! |
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http://www.cc.gatech.edu/classes/AY2002/cs2200_spring/hw/hw7/out3
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| | Geneseo CSci 380 Cache Miss Penalty |
| | 2 or more caches: small and fast near CPU, larger and slower between this and memory | | | How does this fit into a whole computer? | | | Just wait for word CPU needs, not whole block |
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http://www.cs.geneseo.edu/~baldwin/csci380/fall2003/misspenalty1103.html
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| | Cache Miss |
| | A cache miss occurs when the data element requested by the processor IS NOT in the cache. | | | You can’t find the information you want in the library books on your desk, and you have to go back to the UIUC main library. |
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http://archive.ncsa.uiuc.edu/SCD/Training/GridOct98/materials/cachetune-1098/sld021.htm
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| | cache miss |
| | Proxy C has the relevant document cached, so it reports a "cache hit" and sends it in a ICP reply to proxy B, which then sends the relevant document to the client. | | | Client A sends a HTTP request, it gets to proxy B, which does not have the relevant document cached, it then sends a ICP request to its siblings (proxy C), and to its parent (proxy A). |
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http://www2.rad.com/networks/1998/proxy/miss1.htm
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| | Data Cache Miss Rates |
| | Associativity is varied with a different color of line; for example, a direct-mapped cache (associativity = 1) is represented by a green line, and a 16-way associative cache by a light blue line. | | | For each cache size, there are still many parameters to vary. | | | Since these are the traffic results, the y-axis shows the miss rate (in a percentage) that occured during the course of a simulation. |
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http://www.cs.wisc.edu/~remzi/IRAM/p1.dcachemiss.html
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| | [No title] |
| | out-of-order completion cache does not freeze during miss service services hits while processing a miss allow multiple outstanding misses second level caches small first level cache to match CPU clock speed larger second level cache to capture most of the misses that would otherwise go to main memory upshot? | | | set, let the compiler insert prefetches register prefetch cache prefetch nonfaulting or non-binding prefetches no-ops if address being prefetched would cause a fault what should the CPU be doing while the instr. | | | improves temporal locality use elements of a in cache before possibility of eviction blocking for (j = 0; j |
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http://www.cc.gatech.edu/classes/cs6760_98_winter/slides/cache2.ppt
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| | [No title] |
| | Only the predicted subarray is precharged before accessing cache. | | | large cache misses After a cache miss interval, e.g. | | | Prediction is verified after address is generated ó ä ¨ Predictive Precharging Scheme ¡ ª ó É ÷ ¨+ Bitline leakage power reducing architecture ¨ù I-cache Subarray Prediction (ISP) unit Use Most Recently Used (MRU) scheme When a misprediction, Current cache access is aborted by ABORTi signal. |
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http://www.cse.psu.edu/~cg539/sp04/lec11.ppt
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