ReadyBoost: Difference between revisions

→‎Performance: much better!
(→‎Performance: much better!)
A system with 512&nbsp;MB of RAM (the minimum requirement for Windows Vista) can see significant gains from ReadyBoost.<ref>[http://www.anandtech.com/systems/showdoc.aspx?i=2917&p=5 AnandTech: Windows Vista Performance Guide<!-- reflinks title -->]</ref><ref>Schmid, Patrick. [http://www.tomshardware.com/reviews/windows-vista-superfetch-and-readyboostanalyzed,1532-6.html "Windows Vista's SuperFetch and ReadyBoost Analyzed:] Conclusion." Toms Hardware. 2007-01-31.</ref> In one test case, adding 1&nbsp;GB of ReadyBoost memory sped up an operation from 11.7 seconds to 2 seconds. However, increasing the physical memory (RAM) from 512&nbsp;MB to 1&nbsp;GB (without ReadyBoost) reduced it to 0.8 seconds.<ref>[http://www.anandtech.com/systems/showdoc.aspx?i=2917&p=6 AnandTech: Windows Vista Performance Guide<!-- reflinks title -->]</ref> System performance with ReadyBoost can be monitored by Windows Performance Monitor.<ref>Schultz, Greg. [http://www.techrepublic.com/blog/window-on-windows/keep-tabs-on-readyboost-with-windows-7s-performance-monitor/2257 "Keep tabs on ReadyBoost with Windows 7's Performance Monitor."] ''TechRepublic.'' 2010-03-24.</ref> As the price of RAM decreased and more RAM was installed in computers, the mitigations provided by ReadyBoost to systems with insufficient memory decreased.
 
The core idea of ReadyBoost is that a [[flash memory]] (e.g. a [[USB flash drive]] or aan [[Solid-state drive|SSD]]) have a much faster seek time than a typical magnetic hard disk (less than 1&nbsp;ms), allowing it to satisfy requests faster than reading files from the hard disk. It also leverages the inherent advantage of two parallel sources from which to read data, whereas Windows 7 enables the use of up to eight flash drives at once, allowing up to nine parallel sources. [[Universal Serial Bus#USB 2.0|USB 2.0]] flash drives are slower for ''sequential'' reads and writes than modern desktop hard drives. Desktop hard drives can sustain anywhere from 2 to 10 times the transfer speed of USB 2.0 flash drives but are equal to or slower than [[USB 3.0]] and [[IEEE 1394 interface|Firewire (IEEE 1394)]] for sequential data. USB 2.0 and faster flash drives have faster ''random access'' times: typically around 1&nbsp;ms, compared to 12&nbsp;ms for mainstream desktop hard drives.<ref>{{cite web | date = June 2010 | url = http://www.wdc.com/en/products/products.aspx?id=140 | title = WD Scorpio Blue Mobile: Drive Specifications | publisher = [[Western Digital]] | accessdate = 15 January 2011 }}</ref>
 
<!-- High-cost ($500-$20,000) solid state mass storage currently has random sustained external throughput up to 3&nbsp;GB/s (TMS RamSan) and latency as low as 0.003 ms (Violin 1010).<ref>[http://www.storagesearch.com/ssd-fastest.html the Fastest Solid State Disks (SSDs) 1.8&quot;, 2.5&quot; to 3U]</ref>
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