Cache optimization techniques pdf file

The literature in highperformance computing contains many work on cache optimized computing techniques. When you read otherarrayij your machine will, of course, move a line of memory into cache. Cache is a small high speed memory, usually a static ram sram, that contains the most recently accessed pieces of data. Optimization methods for largescale machine learning. I want to thank the many people who have sent me corrections and suggestions for my optimization manuals. Declare as static functions that are not used outside the file where they are defined. Cache optimization reducing miss rate reducing miss penalty reducing hit time cmsc 411 10 from patterson 1 cmsc 411 some from patterson, sussman, others 2 5 basic cache optimizations reducing miss rate 1. In optimization of a design, the design objective could be simply to minimize the cost of production or to maximize the efficiency of production. These sizes are, in fact, popular block sizes for processor caches today. This will exclude other file types from the optimization process if such files are placed in the input folder. An overview of cache optimization techniques and cache. For additional optimization techniques and reference on programming in linear or dsp assembly, see references 1 and 5. In this chapter different types of optimization techniques are described briefly with emphasis on those that are used in the present dissertation.

An overview of cache optimization techniques and cache aware numerical algorithms. Bottomup performance optimization this strategy essentially is performancebydesign wherein performance optimization principles are framed, applied, and maintained right from application design phase. Web chapter a optimization techniques 9 which is graphed in figure a. Cache optimization for cpugpu heterogeneous processors. The simplest way for the cache to map the memory into the cache is to mask off the first 12 and the last 7 bits of the address, then shift to the right 7 bits. In order to mitigate the impact of the growing gap between cpu speed and main memory performance, todays computer architectures. Joint optimization of file placement and delivery in cache. Cache optimization techniques and cache aware numerical algorithms, gi dagstuhl research seminar on algorithms for memory hierarchies, volume. Linux system enhancements, optimization and compiling the kernel. This may include tweaking configuration specifications, turning off unneeded processes, and compiling a.

This is the preferred strategy to incorporate performance as a core development principle instead of. When you read arrayij your machine will, of course, move a line of memory into cache. The full information for the run will be in a file cachegrind. Hence, a number of methods have been developed for solving di. This setting overwrites the value received from the origin in case of a pull zone. Advanced cache optimization 1 way prediction 2 victim cache 3 pipelined cache 4 nonblockingcache 5 multibankedcache 6 critical word first and early restart 7 merging write buffer 8 cilcompiler optii iimizations 9 prefetching. In order to mitigate the impact of the growing gap between cpu speed and main memory performance, todays computer architectures implement hierarchical. Cache optimization cpu cache central processing unit. It is possible that to read the second line the first has to be flushed from cache into ram.

A detailed video on file or web caching which is one among the various way to optimize the wan network data. The index and data caches are sized correctly, and essbase performance is consistently improved by increasing the data file cache, but further increases are bounded by the previous 2 gb addressability limitation. Cache is more expensive than ram, but it is well worth getting a cpu and motherboard with builtin cache in order to maximize system performance. Boot loader optimization tasks basic setup of cpu like setting up clock, memory preparing and handing over device trees clean up like flushing the cache relocate linux kernel from flash to ram most time consuming handover some parameter and switch to linux kernel optimization possibilities. Pdf an overview of cache optimization techniques and cache. Cacheconscious compiler optimizations reduce misses or hide miss penalty. For advanced information on the c6000 architecture, see references 3 and 4. Pdf storage resources and caching techniques permeate almost every area of communication networks today.

Assume a cache block of 4 words, and 4 cycles to send address to main memory 24 cycles to access a word, once the address arrives 4 cycles to send a word back to cache basic miss penalty. One possibility for cache use improvement is to modify your pattern of access to array and otherarray. Type desired file extensions separated by comma in the text field. The classical approach to improving cache behavior is to reduce miss rates, and. While discussing multicore processor for cache optimization, there is a major problem related to the performance of cache which is the cache pollution in last level cache. Contents objective definition introduction advantages optimization parameters problem type variables applied optimisation method other application 2. Victim cache is a small associative back up cache, added to a direct mapped cache, which holds recently evicted lines first look up in direct mapped cache if miss, look in victim cache if hit in victim cache, swap hit line with line now evicted from l1 if miss in victim cache, l1 victim vc, vc victim. Thus, optimization can be taken to be minimization. Check the process only the following file types option. The pdf optimizer feature of adobe acrobat is designed for managing fonts, images, and document content of pdf files. Ppt optimization techniques powerpoint presentation. Algorithms and optimization techniques for highperformance matrixmatrix multiplications of very small matrices. Optimization techniques a free powerpoint ppt presentation displayed as a flash slide show on id.

Optimization techniques are a powerful set of tools that are important in efficiently managing an enterprises resources and thereby maximizing shareholder wealth. Note that the slope of this function is equal to 2 and is constant over the entire range of x values. Introduction the average memory access time formula gave us a framework to present cache optimization for improving cache performance. Correct unit in which to count memory accesses directmapped. File caching web caching wan optimization techniques. He also describes a short test right under figure 6. Recall that the register file per sm is about 256kb, while the. What is cache mapping need of cache mapping duration. The boldfaced entries show the fastest block size for a given cache size.

As in all of these techniques, the cache designer is trying to minimize both the miss rate and the miss penalty. Pdf an overview of hardware based cache optimization. A comparative study of cache optimization techniques and. Joint optimization of file placement and delivery in cache assisted wireless networks with limited lifetime and cache space bojie lv, rui wang, ying cui, yi gong and haisheng tan abstract in this paper, the scheduling of downlink. In web chapter b, linearprogramming techniques, used in solving constrained optimization problems, are examined. Us20170109387a1 cache optimization for data preparation. The setting for cache memory locking controls whether the memory used for the index cache, data file cache, and data cache are locked into physical memory, giving the essbase kernel priority use of system ram. Pdf this paper focuses on optimization techniques for enhancing cache performance find, read and cite all the research you need on. An optimization algorithm is a procedure which is executed iteratively by comparing various solutions till an optimum or a satisfactory solution is found. Before setting cache sizes, you must enable cache memory locking or leave cache memory locking disabled the default. While external memory such as hard disk drives or remote memory components in a distributed computing environment represent the lower end of any common hierarchical memory design, this paper focuses on optimization techniques for enhancing cache performance. The expire value only impacts browser cache and not the keycdn cache. What we end up with is a cache that maps any two addresses exactly 8192 2 bytes apart in main memory to the same cache line.

Offer the illusion of a cache size approaching to main memory. Logical cache line corresponds to n physical lines. Block size the main question that arises while storing files in a fixedsize blocks is the size of the block. It is often used to reduce the file size andor make pdf documents to comply with a specific version of pdf file format. Contents 1 introduction 3 2 machine learning case studies4. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Optimum seeking methods are also known as mathematical programming techniques, which are a branch of operations research. An overview of hardware based cache optimization techniques. Applying the power function rule to this example, where a 2 and b 1, yields 2 note that any variable to the zero power, e. Linux system enhancements, optimization and compiling the. For information about setting cache values, see optimizing essbase caches. This data can be read into register or into cache shared memory or register in case of the gpu kernel. Register file is bigger than shared memory and l1 cache. The data memory system modeled after the intel i7 consists of a 32kb l1 cache with a four cycle access latency.