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Flashcache is a disk cache component for the Linux kernel, initially developed by Facebook since April 2010, and released as open source in 2011. Since January 2013, there is a fork of Flashcache, named EnhanceIO and developed by sTec, Inc.[1]
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Flashcache works by using flash memory, a USB flash drive, SD card, CompactFlash or any kind of portable flash mass storage system as a write-back persistent cache. An internal SSD can also be used for increasing performance.
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Our Service objective of providing affordable and cost effective remote Oracle Applications functional & Technical Support, quality assurance, implementation and advisory services right from the India. We provide efficient & highly skilled IT professionals Our consultants are specially selected for their talent, experience and quality of work. Assist employees to fully leverage the benefits of. We would like to show you a description here but the site won’t allow us. Cache memory, also called Cache, a supplementary memory system that temporarily stores frequently used instructions and data for quicker processing by the central processor of a computer. The cache augments, and is an extension of, a computer’s main memory. Both main memory and cache are. Exadata Smart Flash Cache transforms the data in the following stages: Oracle Exadata caches data from eligible scans in a legacy columnar format so that the data is available immediately. This format is columnar, but it is not the same format used by the IM column store. PGAAGGREGATETARGET is a database initialization parameter and controls the total amount of execution memory that can be allocated by Oracle for the Process global area (PGA). PGAAGGREGATETARGET = (TOTALMEM. 80%). 50%. The Total Memory here refers to the total memory available in the system.
Overview[edit]
Using flash memory (NAND memory devices) for caching allows Linux kernel to service random disk IO with better performance than without the cache. This caching applies to all disk content, not just the page file or system binaries. Flash memory based devices are usually a magnitude faster than spinning HDDs for random IO, but with less advantage or even slower in sequential read/writes. By default, flashcache caches all full blocksize IOs, but can be configured to only cache random IO whilst ignoring sequential IO.[2]
Similar technology exists in Microsoft Windows as ReadyBoost since Windows Vista.
Implementation[edit]
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Flashcache is built on top of the Linux kernel's device mapper. The data structure of the cache is a set-associativehash table, in which the cache is divided up into a number of fixed-size sets (buckets), using linear probing within a set to find blocks. The device mapper layer breaks up all I/O requests into blocksize chunks before passing the requests to the cache layer.[citation needed]
When a write request happens, the corresponding cache block is marked dirty; dirty cache blocks are written lazily to disk in the background. Download vst halftime by cableguys free. There are a few parameters to control the write-back policy: dirty-threshold, idleness and contiguity with other dirty blocks about to be written back.[citation needed]
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Limitations[edit]
There are a few limitations, imposed by the implementation of flashcache:[citation needed]
- Atomicity
- Cache block writes are currently non-atomic.
- TRIM support
- ATA TRIM command to optimize flash memory are not yet supported.
- Cache pollution protection
- A process can be marked non-cacheable to prevent flashcache cache its requests; however, if a process that marked itself non-cacheable dies, flashcache has no way of cleaning up.
- Alignment
- Relying on the device mapper resulted in caching performance issues and no caching of writes that are not multiple of 4 KiB. Primarily, this affects the Xen hypervisor. Thus, EnhanceIO has moved away from the device mapper integration, yielding higher performance for unoptimal use cases.[citation needed]
- Write-around read latency impact
- in write-around mode all writes bypass the cache for high consistency. The current implementation will fetch reads through the SSD device and then deliver them to the actual reader. This means that previously uncached blocks will always need to go to the SSD device first, causing a constant write IO. Not an issue on enterprise SSD or highend PCIe devices as facebook uses, but degrades performance on lower end SSD.
- Write-around read cache warm-up phase
- in write-around mode FlashCache has no information to compare the age of cached pages over the on-disk ones. (1) Because the device could have been mounted outside of FlashCache (2) Because no writes are tracked in this mode. This results in an empty cache after each volume activation (i.e.: reboot). Performance will be degraded until all hot areas have been cached.
See also[edit]
- Cache Acceleration Software (Intel's product)
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References[edit]
- ^EnhanceIO: New Solid State Drive Caching For Linux
- ^Mohan Srinivasan. 'Flashcache : A Write Back Block Cache for Linux'.
External links[edit]
- Performance Comparison among EnhanceIO, bcache and dm-cache (LKML)