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algol needing the smallest and fortran and cobol needing the largest cache sizes disputed discuss in the early days of microcomputer technology memory access was only slightly slower than register access but since the 1980s 64 the performance gap between processor and memory has been growing microprocessors have advanced much faster than memory especially in terms of their operating frequency so memory became a performance bottleneck while it was technically possible to have all the main memory as fast as the cpu a more economically viable path has been taken use plenty of low speed memory but also introduce a small high speed cache memory to alleviate the performance gap this provided an order of magnitude more capacity for the same price with only a slightly reduced combined performance first tlb implementations edit the first documented uses of a tlb were on the ge 645 65 and the ibm 360 67 66 both of which used an associative memory as a tlb first instruction cache edit the first documented use of an instruction cache was on the cdc 6600 67 first data cache edit the first documented use of a data cache was on the ibm system 360 model 85 68 in 68k microprocessors edit the 68010 released in 1982 has a loop mode which can be considered a tiny and special case instruction cache that accelerates loops that consist of only two instructions the 68020 released in 1984 replaced that with a typical instruction cache of 256 bytes being the first 68k series processor to feature true on chip cache memory the 68030 released in 1987 is basically a 68020 core with an additional 256 byte data cache an on chip memory management unit mmu a process shrink and added burst mode for the caches the 68040 released in 1990 has split instruction and data caches of four kilobytes each the 68060 released in 1994 has the following 8 kib data cache four way associative 8 kib instruction cache four way associative 96 byte fifo instruction buffer 256 entry branch cache and 64 entry address translation cache mmu buffer four way associative in x86 microprocessors edit example of a motherboard with an i386 microprocessor 33 mhz 64 kib cache 25 ns 8 chips in the bottom left corner 2 mib dram 70 ns 8 simms to the right of the cache and a cache controller austek a38202 to the right of the processor as the x86 microprocessors reached clock rates of 20 mhz and above in the 386 small amounts of fast cache memory began to be featured in systems to improve performance this was because the dram used for main memory had significant latency up to 120 ns as well as refresh cycles the cache was constructed from more expensive but significantly faster sram memory cells which at the time had latencies around 10 25 ns the early caches were external to the processor and typically located on the motherboard in the form of eight or nine dip devices placed in sockets to enable the cache as an optional extra or upgrade feature some versions of the intel 386 processor could support 16 to 256 kib of external cache with the 486 processor an 8 kib cache was integrated directly into the cpu die this cache was termed level 1 or l1 cache to differentiate it from the slower on motherboard or level 2 l2 cache these on motherboard caches were much larger with the most common size being 256 kib there were some system boards that contained sockets for the intel 485turbocache daughtercard which had either 64 or 128 kbyte of cache memory 69 70 the popularity of on motherboard cache continued through the pentium mmx era but was made obsolete by the introduction of sdram and the growing disparity between bus clock rates and cpu clock rates which caused on motherboard cache to be only slightly faster than main memory the next development in cache implementation in the x86 microprocessors began with the pentium pro which brought the secondary cache onto the same package as the microprocessor clocked at the same frequency as the microprocessor on motherboard caches enjoyed prolonged popularity thanks to the amd k6 2 and amd k6 iii processors that still used socket 7 which was previously used by intel with on motherboard caches k6 iii included 256 kib on die l2 cache and took advantage of the on board cache as a third level cache named l3 motherboards with up to 2 mib of on board cache were produced after the socket 7 became obsolete on motherboard cache disappeared from the x86 systems the three level caches were used again first with the introduction of the intel xeon mp foster core 71 where the l3 cache was added to the cpu die it became common for the total cache sizes to be increasingly larger in newer processor generations and recently as of 2011 it is not uncommon to find level 3 cache sizes of tens of megabytes 72 intel introduced a level 4 on package cache with the haswell microarchitecture crystalwell 38 haswell cpus equipped with the gt3e variant of intel s integrated iris pro graphics effectively feature 128 mib of embedded dram edram on the same package this l4 cache is shared dynamically between the on die gpu and cpu and serves as a victim cache to the cpu s l3 cache 39 in arm microprocessors edit the apple m1 cpu has 128 or 192 kib of l1 instruction cache for each core important for latency single thread performance depending on core type this is an unusually large l1 cache for any cpu type not just for a laptop the total cache memory size is not unusually large the total is more important for throughput for a laptop and much larger total e g l3 or l4 sizes are available in ibm s mainframes current research edit early cache designs focused entirely on the direct cost of cache and ram and average execution speed more recent cache designs also consider energy efficiency fault tolerance and other goals 73 74 there are several tools available to computer architects to help explore tradeoffs between the cache cycle time energy and area the cacti cache simulator 75 and the simplescalar instruction set simulator are two open source options multi ported cache edit a multi ported cache is a cache which can serve more than one request at a time when accessing a traditional cache we normally use a single memory address whereas in a multi ported cache we may request n addresses at a time where n is the number of ports that connected through the processor and the cache the benefit of this is that a pipelined processor may access memory from different phases in its pipeline another benefit is that it allows the concept of super scalar processors through different cache levels see also edit branch predictor cache computing cache algorithms cache coherence cache control instructions cache hierarchy cache placement policies cache prefetching dinero cache simulator instruction unit locality of reference memoization memory hierarchy micro operation no write allocation scratchpad ram sum addressed decoder write buffer notes edit the very first paging machine the ferranti atlas 29 30 had no page tables in main memory there was an associative memory with one entry for every 512 word page frame of core references edit torres gabriel september 12 2007 how the cache memory works su chao zeng qingkai 2021 06 10 nicopolitidis petros ed survey of cpu cache based side channel attacks systematic analysis security models and countermeasures security and communication networks 2021 1 15 doi 10 1155 2021 5559552 issn 1939 0122 landy barry november 2012 atlas 2 at cambridge mathematical laboratory and aldermaston and cad centre two tunnel diode stores were developed at cambridge one which worked very well speeded up the fetching of operands the other was intended to speed up the fetching of instructions the idea was that most instructions are obeyed in sequence so when an instruction was fetched that word was placed in the slave store in the location given by the fetch address modulo 32 the remaining bits of the fetch address were also stored if the wanted word was in the slave it was read from there instead of main memory 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